Cladded sodium percarbonate particles

FIELD: chemistry.

SUBSTANCE: sodium percarbonate particles are covered by a cladding which contains anhydrous sodium sulphate in amount of 70-99.8 wt % and sodium borate in amount of 0.2-20 wt % and where said cladding accounts for 1-10% of the total weight of one particle of sodium percarbonate.

EFFECT: high stability during storage when using sodium percarbonate particles as a component of detergent and cleaning agents.

9 cl, 2 tbl, 2 ex

 

The invention relates to coated particles of percarbonate sodium, with a high storage stability in the composition of detergents and cleaning agents.

Percarbonate sodium finds wide application as having bleaching action of the component in detergents and cleaning agents. To apply for these purposes, percarbonate sodium must have in the composition of detergents sufficient stability (resistance) during storage, because otherwise, when the storage containing detergents can result in the loss of active oxygen loss as a result percarbonate sodium its bleaching action. Percarbonate sodium sensitive to contact with moisture under the influence of which it decomposes in the composition of the detergents with the loss of active oxygen. Therefore, for the manufacture of detergents or cleaning agents percarbonate sodium is usually used in the form of particles in the shell, which protects covered with it particles of percarbonate sodium from moisture. To apply for this purpose suitable shell of inorganic gidratoobrazovaniya salts, such as sodium carbonate, sodium sulfate or magnesium sulfate, and mixtures of such salts are known in particular from DE 2417572, EP 0863842 and US 4325933.

In the US 4526698 described particles perk is rbonate sodium, covered bortagaray shell. Such shell along with borate may also contain organic or inorganic compounds. As examples of inorganic compounds in the specified publication mentioned sodium carbonate, Glauber's salt and magnesium sulfate. The figures in this publication examples that the use of sodium borate in combination with polyethylene glycol, organic complexing agents, silicates of sodium or magnesium compounds observed a synergistic effect in the stabilization of particles percarbonate sodium, whereas the use of sodium borate in combination with sodium carbonate synergism is missing.

In WO 95/15292 described a method of obtaining particles of percarbonate alkaline metal containing boric acid membrane by spraying an aqueous solution, which in addition to boric acid also contains a neutral salt of an alkali metal or ammonium, increase the solubility of boric acid. As preferred for use in these purposes of salts in the specified publication mentioned sodium chloride, potassium chloride, sodium sulfate and potassium sulfate. In addition, in the aforementioned publication says about the use of borates of alkali metals in addition to boric acid or instead of it. According to this publication, the use of neutral is th salt of an alkali metal in combination with borate should reduce the tendency of particles percarbonates alkali metal to agglomerate. However, in WO 95/15292 does not contain any information about the stabilization of the particles percarbonates alkali metal bortagaray shell.

In EP 567140 describes a method for coated particles percarbonate sodium by drawing on their core forming a first shell component selected from boric acid, borates and silicates of alkali metals, and forming a second shell component selected from carbonates, bicarbonates and sulphates, with the application of at least one of forming the sheath component of the aqueous slurry. In the example in this publication, examples 2, 4 and 5 described particles percarbonate sodium shell of 5.5 wt.% tetrahydrate of metaborate sodium in combination with 5 wt.% soda, sodium bicarbonate or sodium sulfate. The figures in this publication examples 30-32 follows that particles percarbonate sodium, covered by a shell of borate in combination with sodium sulfate, have in the detergent composition worst storage stability than particles percarbonate sodium, covered by a shell of borate in combination with soda, respectively, of the borate in combination with sodium bicarbonate.

In DE 2712139 described particles percarbonate sodium shell of dehydrated sodium perborate and sodium silicate, optionally containing inert water-bonding the substances. As suitable connecting the water inert substances specified in the publication referred to, sodium tripolyphosphate, soda ash, sodium sulfate and percarbonate sodium. Described in this publication particles percarbonate contain sodium perborate monohydrate sodium in an amount of 5 wt.% and more and accordingly have a high boron content.

The disadvantage of the prior art particles percarbonate sodium bortagaray shell is relatively high boron content in the shell from which thereby when the use is covered by particles percarbonate sodium in detergents or cleaners in the formed in their application the wastewater gets an unnecessarily large number of Borat.

With the invention it has been unexpectedly found that when using particles percarbonate sodium with sheath, which accounts for from 1 to 10 wt.% from the whole mass of one particle of percarbonate sodium and which contains sodium sulfate in the amount of 70 wt.% or more and sodium borate in the amount of up to 20 wt.%, the sodium sulfate and sodium borate have a synergistic effect on the stabilization of the particles percarbonate sodium in the composition of detergents, i.e. similar shell provides better stabilization of the particles percarbonate sodium than the shell of the su is that sodium or sodium borate.

In accordance with the foregoing object, the present invention presents particles percarbonate sodium, coated, which contains anhydrous sodium sulfate in an amount of from 70 to 99.8 wt.% and sodium borate in an amount of from 0.2 to 20 wt.% and at the mass which accounts for from 1 to 10% based on the whole mass of one particle of percarbonate sodium.

Proposed in the invention particles percarbonate sodium have a heart, which consists mainly of perpetrate sodium carbonate composition 2Na2CO3·3H2O2. The core of the proposed invention particles percarbonate sodium may also contain small quantities of known stabilizers, peroxide compounds, for example magnesium salts, silicates, phosphates and/or chelating agents. The relative content of percarbonate sodium in the core of the proposed invention the particles preferably should be more than 80 wt.%, particularly preferably more than 95 wt.%. Relative content of organic carbon in the core of the proposed invention particles percarbonate sodium preferably should be less than 1 wt.%, especially preferably less than 0.1 wt.%.

In one of the preferred options core proposed in the invention particles percarbonate sodium contains small quantities EXT is Cai, which stabilize the concentration of active oxygen and the share of which in the core should preferably be less than 2 wt.%. As such enhance the stability of the content of active oxygen supplementation is preferable to use magnesium salts, liquid glass, stannate, pyrophosphates, polyphosphates, and chelating agents from the group hydroxycarbonic acids, aminocarbonyl acids, aminophosphonic acids, phosphonocarboxylate acids and hydroxyphosphonic acids, as well as their salts with alkali metals, ammonium salts and magnesium salts. In one particularly preferred options core proposed in the invention particles percarbonate contains sodium as a stabilizing concentration of active oxygen supplements silicate of an alkali metal, preferably liquid glass module SiO2/Na2O in the range from 1 to 3, in the amount of from 0.1 to 1 wt.%. In the most preferred embodiment, additionally, the quantity of silicate of alkaline metal core proposed in the invention particles percarbonate sodium also contains a magnesium compound in an amount of from 50 to 2000 hours/million Mg2+.

The core of the proposed invention particles percarbonate sodium is possible to form one of the known methods of obtaining it. One of the methods suitable for receiving the perk is bonate sodium, is the crystallization of sodium carbonate from aqueous solutions of hydrogen peroxide and sodium carbonate, which can be performed in the presence and in the absence of vicalvaro means, for example, in accordance with the methods described in EP 0703190 and DE 2744574. Particles percarbonate sodium obtained by this method of crystallization in the presence of vicalvaro means can optionally contain small amounts of used wasalways agent, for example sodium chloride. Others can be used to produce percarbonate sodium method is method (durastically) granulation in the fluidized bed, which consists in spraying an aqueous solution of hydrogen peroxide and aqueous soda solution into the fluidized bed in the germ percarbonate sodium with simultaneous evaporation of water, for example in accordance with WO 95/06615. Another can be used to produce percarbonate sodium method is a method based on the interaction of solid sodium carbonate with an aqueous solution of hydrogen peroxide, followed by drying the obtained product.

In one of the preferred options proposed in the invention particles percarbonate sodium have a small core of percarbonate sodium, which is formed by granulation in the fluidized bed of an aqueous solution of hydrogen peroxide and sodium carbonate. T is Kai granulation in the fluidized bed allows forming of the core, which differ from those obtained by other methods of cores particularly dense texture and rounded shape and smooth surface. Covered proposed in the invention the shell of the particles percarbonate sodium in the core obtained by the granulation in the fluidized bed, are compared with the particles, the core of which is obtained by a different method, better storage stability in the composition of detergents and cleaning agents.

Proposed in the invention particles percarbonate sodium, respectively their hearts from percarbonate sodium, coated, which contains anhydrous sodium sulfate in an amount of from 70 to 99.8 wt.% and sodium borate in an amount of from 0.2 to 20 wt.% and at the mass which accounts for from 1 to 10% based on the whole mass of one particle of percarbonate sodium. The relative content of sodium sulfate in the shell should preferably be at least 80 wt.%, more preferably at least 90 wt.%. The proportion of sodium borate in the shell should preferably be from 0.2 to less than 10 wt.%, most preferably from 0.5 to 5 wt.%. The data about the content of sodium borate in the shell are related to the content of anhydrous metaborate sodium NaBO2. However, the sodium borate can be represented in the shell and in the form of sodium borate other elements, e.g. the, in the form of sodium tetraborate Na2B4O16, octaborate Na2B8O13or pentaborate Na2B10O16.

Mass share of such membranes in terms of the mass of one particle of percarbonate sodium should preferably be from 2 to 8%, most preferably from 2%to 6%. In one particularly preferred options relative content of sodium borate in the shell and its mass fraction in terms of the mass of one particle of percarbonate sodium chosen such that the boron content in the proposed invention coated particles percarbonate sodium ranged from 20 to 700 hours/million, primarily from 50 to 350 hours/million

Shell proposed in the invention covered by particles percarbonate sodium may, in addition to sodium sulfate and sodium borate optionally also contain sodium carbonate, sodium bicarbonate or mixtures thereof in amounts of up to 25 wt.%. Sodium carbonate and sodium bicarbonate can also be presented in the form of mixed salts with sodium sulfate, and the sodium carbonate is preferably used in the form of a mixed salt composition 2Na2SO4·Na2CO3. In a preferred embodiment, the content of other compounds containing sodium sulfate and sodium borate shell proposed in the invention particles percarbonate on the RIA should not, addition of sodium sulfate, sodium borate, sodium carbonate, sodium bicarbonate and mixed salts, exceed 5 wt.%.

In addition to the proposed invention, containing sodium sulfate and sodium borate shell proposed in the invention particles percarbonate sodium can have another one - or multi-layered membrane, which can be located between the core and proposed in the invention the shell or on top of it. Proposed in the invention the shell is preferably applied directly on the core material from percarbonate sodium.

Between the layers of the multilayer shell, and between the inner layer and the core may be a clear line of demarcation, which abruptly changes the chemical composition. Usually, however, between the individual layers of the multilayer shell, and between the inner layer and the core is formed by a transition zone, which contains components of both adjacent layers. Such transition zones are formed, for example, when applying the next layer multilayer membrane from the aqueous solution, when in the beginning of the formation of such a surface layer portion located underneath layer is dissolved with the formation in the transition zone that contains the components of both layers. Thus, in the preferred VA is ianthe, where proposed in the invention the membrane is applied directly to the core percarbonate sodium, between the core and proposed in the invention, the shell can be formed an intermediate layer containing sodium sulfate, sodium borate, sodium carbonate, sodium bicarbonate, and mixed salts of these components.

In a preferred embodiment of the proposed invention containing sodium sulfate and sodium borate, the membrane must cover located underneath the material is more than 95%, particularly preferably more than 98%, primarily completely.

In one of the preferred options proposed in the invention particles percarbonate sodium have the shell done in the fluidized bed by spraying it in the aqueous solution, which contains sodium sulfate and sodium borate in solution, with simultaneous evaporation of water. Obtained in this way coated particles percarbonate sodium differ from particles percarbonate sodium, one of the components of the shell which is applied in solid form, a uniform distribution of sodium sulfate and sodium borate in the shell and compared with particles of percarbonate sodium uneven distribution of sodium sulfate and sodium borate in the coating shell have in the compositions of detergents better the stability during storage.

In one particularly preferred options proposed in the invention particles percarbonate sodium have the shell done by spraying an aqueous solution, which contains sodium sulfate and sodium borate in dissolved form and content in which dissolved salts in total does not exceed 25 wt.%. Unlike the prior art, according to which to apply the shell is recommended solutions forming components with the highest possible concentration to minimize thereby the amount of evaporating water, when creating the present invention unexpectedly found that particles percarbonate sodium, covered proposed in the invention sheath, which contains the sodium sulfate and sodium borate, and which is obtained by spraying an aqueous solution with a content of dissolved salts is not more than 25 wt.%, have in the compositions of detergents better storage stability than particles percarbonate sodium with sheath obtained by spraying an aqueous solution with a higher content of dissolved salts in it.

For the application proposed in the invention, the shell containing sodium sulfate and sodium borate, you can use the solutions obtained by dissolving sodium sulfate and borate of an alkali metal in water. In the line is the reattaching not sodium borate, and Borat other alkali metal borate of sodium, which is part of the final shell is formed by spraying a solution containing sodium ions, the source of which is sodium sulfate.

Under the influence of heat applied in the process of spraying an aqueous solution containing dissolved therein sodium sulfate and sodium borate, already evaporation predominant part, especially more than 90% present in the water, and therefore, when drawing the shell is re-dissolved only minor surface portion located underneath the material, which result during the spraying of the specified solution, a solid shell. Proposed in the invention the shell is preferably applied by spraying containing sodium sulfate and sodium borate aqueous solution in the fluidized bed, particularly preferably described in EP 0970917 a way that, using small quantities of forming a shell material allows to obtain a dense shell. When drawing the shell in the fluidized bed it is preferable to apply a drying gas, which helps to maintain in the fluidized bed temperature in the range of from 30 to 90°C, preferably from 50 to 70°C.

Proposed in the invention particles percarbonate sodium, coated, containing Sul is at sodium and sodium borate, unexpectedly exhibit better storage stability in the composition of detergents than particles percarbonate sodium envelope which contains only one of these two components. Proposed in the invention particles percarbonate sodium have better storage stability compared with particles of percarbonate sodium in the shell instead of the sodium sulfate in the same amount in combination with sodium borate contains other linking water salt, for example sodium carbonate or sodium bicarbonate. Due to the improved stability of the proposed invention particles percarbonate sodium storage in the compositions of detergents reduces the loss of active oxygen during storage of such tools in wet environments.

Proposed in the invention the coated particles of percarbonate sodium in addition do not show any tendency to caking under the action of compressive loads and have only a small own heat dissipation, and therefore can be safely stored in the hopper without the danger of caking or self-heating of its contents.

In addition, and detergents, and cleaning agents containing coated proposed in the invention the shell of the particles percarbonate, have more security when stored in bunkers, as they are when XP is in heated under adiabatic conditions are characterized by a complete lack of self heating or show only a small ability to him.

In the following embodiment, the invention proposed therein coated particles percarbonate sodium may have additional cover as a main component contains an alkali metal silicate (silica) module SiO2the oxide of the alkali metal in excess of 2.5. This additional shell is preferably applied over proposed in the invention of the shell. As a main component an additional shell contains a silicate of an alkali metal, if it does not contain any other component in the relative mass excess of the proportion of alkali metal silicate. Module silicate of alkaline metal in the preferred embodiment is 3 to 5, most preferably from 3.2 to 4.2. The share of such additional shell has proposed in the invention, the coated particles percarbonate sodium should preferably be from 0.2 to 3 wt.%. The relative content of alkali metal silicate in the material of the additional sheath should preferably be more than 50 wt.%, especially preferably more than 80 wt.%. As the alkali metal silicate in the composition of the additional sheath is preferable to use sodium silicate, most preferably sodium silicate.

Covered offer from the britanii shell particles percarbonate sodium with additional shell containing as a main component an alkali metal silicate with a modulus SiO2to alkali metal oxide of more than 2.5, further characterized by slow dissolution in water and improved stability during storage in a liquid or gel-like medium containing water in an amount up to 15 wt.%. Therefore, such particles are preferably used for the manufacture of liquid or gel detergents or cleaning agents.

In yet another embodiment, the invention proposed therein coated particles percarbonate sodium can optionally contain on its surface finely dispersed oxide of silicon, aluminum or titanium or a mixed oxide of these elements in amounts of from 0.01 to 1 wt.%, preferably from 0.1 to 0.5 wt.%. As an example, suitable for use in this purpose, highly dispersed oxides can be called pyrogenic oxides produced by flame hydrolysis of volatile compounds of silicon, aluminum or titanium or mixtures of such compounds. The primary particles obtained in this way pyrogenic oxides or mixed oxides in the preferred embodiment, have an average size less than 50 nm and can be aggregated into larger particles, the average size of which in the preferred embodiment, is less than 20 μm. Similarly the use of uedennyh oxides, precipitated from aqueous solutions of compounds of silicon, aluminum or titanium or mixtures of these compounds. Precipitated oxides, respectively mixed oxide along with silicon, aluminum and/or titanium may also contain small amounts of ions of alkali or alkaline earth metals. The average particle size of precipitated oxides in the preferred embodiment, is less than 50 μm, particularly preferably less than 20 μm. The specific surface of highly dispersed oxides, determined by the method of brunauer-Emmett-teller by nitrogen adsorption (BET method), in the preferred embodiment, is from 100 to 300 m2/year

In a preferred embodiment of the proposed invention the coated particles of percarbonate sodium contain on their surface gidrofobizirovannym highly dispersed oxide, particularly preferably gidrofobizirovannogo pyrogenic or precipitated silicic acid. Under gidrofobizirovannym oxides according to the invention are oxides having on its surface associated with chemical bonds of organic residues and is not wetted by water. Hydrophobizated oxides can be obtained, for example, the interaction of pyrogenic or precipitated oxides with organosilane, silazane or polysiloxane. Suitable for hydrophobized oxide compounds kremnyova in EP 0722992 (p.3, line 9, to p.6, line 6). Especially preferred Hydrophobizated oxides obtained by the interaction of highly dispersed oxide with a silicon compound, related to given in EP 0722992 classes of compounds (a)to(e) and (k)-(m). Wettability hydrophobized fine oxide methanol preferably should be at least 40.

Covered proposed in the invention the shell of the particles percarbonate sodium, additionally containing on their surface a finely dispersed oxide, are even less prone to caking during storage, especially when stored in conditions where they are exposed to compressive loads, and therefore even more suitable for storage in silos. In addition, these particles possess higher stability during storage in the compositions of detergents and cleaning agents.

The average size of the proposed invention particles percarbonate sodium in the preferred embodiment, is from 0.2 to 5 mm, particularly preferably from 0.5 to 2 mm, the Preferred particle percarbonate sodium with low content of fine fraction, preferably containing less than 10 wt.% particle size of less than 0.2 mm, particularly preferably less than 10 wt.% particle size less than 0.3 mm

Proposed in the invention particles percarbonate on the rija mostly are mostly spherical in shape with smooth surface. The particles with a smooth surface, its roughness is less than 10%, preferably less than 5%, of the diameter of the particles.

Through appropriate selection of the size proposed in the invention particles percarbonate sodium and it is possible to improve the storage stability in the compositions of detergents and cleaning agents.

Covered proposed in the invention the shell of the particles percarbonate sodium is preferably used in detergents and cleaning agents as having bleaching action of the component. Under the detergents according to the invention refers to all compositions suitable for removing contaminants from textiles in an aqueous washing solution. Under the same cleaning means according to the invention are all compounds which are suitable in interaction with water to remove the dirt from the corresponding surfaces will not absorb water or able to absorb only a small quantity. One preferred according to the invention forms cleaners are tools for the mechanical washing of dishes and Cutlery in the dishwasher.

Another object of the present invention are detergents and cleaners containing coated proposed in the invention the shell of the particles percarbonate sodium. The content offered in izopet the Institute of coated particles percarbonate sodium in such detergents and cleaning agents should preferably be from 1 to 40 wt.% in terms of the total weight of detergent, accordingly, a cleaning tool.

The proposed invention in detergents and cleaners can be represented in solid form and can in this case along with the proposed invention coated particles percarbonate sodium contain other components in the form of powders or granules. In addition, detergents may also constitute or contain extruded molded product, a component of which may be proposed in the invention the coated particles of percarbonate sodium. Such extruded molded product in the form of extrudates, pellets, briquettes or tablets can be obtained in various ways briquetting, primarily by means of extrusion, extrusion, extrusion firmware seal on rolls or tableting. For briquetting in the composition of the proposed invention in detergents or cleaning agents may be added to a binder, giving during briquetting molded products increased strength. In cases where the proposed invention in detergents and cleaners represent or contain extruded molded product, but do not contain any additional binder, it is preferable that its function was performed by one having detergent action of the components, e.g. the, nonionic surface-active agent (surfactant).

The proposed invention in detergents and cleaners can also be presented in liquid or gel form, and can contain proposed in the invention the coated particles of percarbonate sodium dispergirovannykh in liquid, gel phase, respectively. Along with the proposed invention coated particles percarbonate sodium in liquid, gel respectively, the phase can be dispersed and other particles. Liquid, gel respectively, the phase should preferably be of such rheological properties to dispersed therein particles remained suspended and were not deposited during storage. Therefore, the liquid phase should preferably have such a structure that provides its thixotropic or pseudo-plastic rheological properties. To make such rheological properties of the liquid detergent and cleaning agents in their composition as additives can be used suspendresume auxiliary substances, such as swelling clays, primarily montmorillonite, precipitated and pyrogenic silicic acid, vegetable gums, especially xantana, or polymer geleobrazovanie, such as vinyl polymers with carboxyl groups.

Offered in izobreteny the detergents and cleaners, presented in liquid or gel form, in the preferred embodiment, contain proposed in the invention the coated particles of percarbonate sodium with additional shell containing as its main component an alkali metal silicate with a modulus SiO2the oxide of the alkali metal in excess of 2.5. In this embodiment, detergents and cleaners may contain water in an amount up to 15 wt.% without danger of dissolution when the surface layer of coated particles percarbonate sodium during storage and the resulting allocation of hydrogen peroxide in liquid, gel phase, respectively.

Along with the proposed invention coated particles percarbonate sodium proposed in the invention, the detergents and cleaning agents may contain, as other components, for example surfactants, active or modifying additives, alkaline components, bleach activators, enzymes, chelating complexing agents (chelating agents), inhibitors Pomerania (darkening), defoamers, optical brighteners, perfumes and dyes.

As surface-active substances in the proposed invention in detergents and cleaning agents can be used mainly anion active, nonionic and kationaktivnaya surfactant.

It is suitable for the application of the proposed invention in detergents and cleaning agents of anion active surface active substances include, for example, surfactants with sulphonate groups, preferably alkylbenzenesulfonate, alkanesulfonyl, α-reincorporate, fatty esters of α-sulfonic acids or sulfosuccinate. Among alkylbenzenesulfonates preferred those with linear or branched alkyl group with 8 to 20, especially 10 to 16, carbon atoms. It is preferable alkanesulfonyl include those with straight alkyl chain with 12 to 18 carbon atoms. From among α-reincorporates it is preferable to use the products of sulfonation of α-olefins with 12 to 18 carbon atoms. From among esters of fatty α-sulfonic acids are preferred products of sulfonation of fatty acid esters derived from fatty acids with 12-18 carbon atoms and short-chained alcohols with 1-3 carbon atoms. As anion active surfactants suitable surfactants with sulfate groups in the molecule, preferably an alkyl sulphates and esterified sulfates. For your preferred include alkyl sulphates such linear alkyl residues with 12-18 carbon atoms. In addition to these also suitable β-branched alkyl sulphates and one or mnogosloinye the alkyl in the center of the longest alkyl chain alkyl sulphates. To the preferred esterified sulfate include sulfates alilovic esters obtained by ethoxycarbonyl linear alcohol is from 12-18 carbon atoms 2-6 ethylenoxide links and subsequent sulfation. As anion active surfactants can also be used in Soaps, such as, for example, formed with alkali metal salts of lauric acid, myristic acid, palmitic acid, stearic acid and/or mixtures of natural fatty acids, such as fatty acids of coconut oil, palm kernel oil or tall oil.

As nonionic surfactants can be used, for example, alkoxysilane, especially ethoxylated and propoxycarbonyl, connections. The most suitable condensation products of alkyl phenols or fatty alcohols with 1-50 moles, preferably 1 to 10 moles, of ethylene oxide and/or propylene oxide. Equally suitable amides of fatty polyhydroxylated, in which the nitrogen atom of amide-linked organic residue with one or more hydroxyl groups, which can also be alkoxysilane. As nonionic surfactants can also be used Alkylglucoside with a linear or branched alkyl group with 8-22, especially from 12 to 18, carbon atoms and mono - or diglycoside residue, preferably representing a derivative of glucose.

It is suitable for use in the proposed invention in detergents and cleaning agents kationaktivnaya surfactants include, for example, mono - and dialkoxybenzene Quaternary amines linked with AZ is that C 6-C18alkyl residue and one or two hydroxyalkyl groups.

The proposed invention in detergents and cleaners usually contain active or modifying additives that are capable of when they use to bind the dissolved ions of calcium and magnesium. Such active or modifying additives include phosphates and polyphosphates, alkali metal, especially pentanedithiol, soluble and not water soluble silicates of sodium, primarily layered silicates of the formula Na5Si2O5the zeolites of type a, X and/or P, and trinatriytsitrat. In addition to the aforesaid additives can be used, in addition, active or modifying organic adamaki, such as polyacrylic acid, poliasparaginovaya acid and/or copolymers of acrylic acid and methacrylic acid, acrolein or containing sulfonic acid vinyl monomers, and their salts with alkali metals.

In the structure proposed in the invention as detergents usually also include alkaline components that, when the target application provide for the creation in the washing solution, respectively, in an aqueous solution of detergent alkaline environment with a pH value ranging from 8 to 12. For applications such as alkaline components suitable p is pout all sodium carbonate, sesquicarbonate sodium, metasilicate sodium and other soluble alkali metal silicates.

As bleach activators in the proposed invention in detergents and cleaning agents can be used primarily compounds with one or several capable peligroso (exhaustive hydrolysis), linked by the nitrogen or oxygen of the acyl groups in the washing solution, respectively, in an aqueous solution of detergent, react with released from the particles percarbonate sodium peroxide with the formation of peroxycarboxylic acids. As an example, such compounds can be called polyallylamine alkylenediamine, primarily tetraacetylethylenediamine (TAED), acylated derivatives of triazines, especially 1,5-diacetyl-2,4-dioxohexane-1,3,5-triazine (DADHT), acylated glycoluril, primarily tetraaceticacid (TAGU), N-acylamide, primarily N-nonavailability (WEAR), acylated phenolsulfonate, primarily n-nonanoyl - or ISO-nonanoyloxybenzenesulfonate (h-, respectively ISO-NOBS), carboxylic anhydrides of the acids, such as phthalic anhydride, acylated polyhydric alcohols, such as etilenglikolevye, 2,5-diacetoxy-2,5-dihydrofuran, acylated sorbitol and mannitol and acylated sugar, such as pentaacetate, enol ethers, and t is the N train-the acylated lactams, first of all N-alloplasty and N-acellularity. Equally as bleaching activators may be used aminophenylalanine NITRILES and their salts (Quaternary ammonium salt NITRILES), known, for example, from the log Tenside Surf. Det. 34(6), 1997, s-409. In addition, as bleaching activators may apply the transition metal complexes capable of activating hydrogen peroxide to remove stains from simultaneous bleaching effect. Suitable for use in the above order complexes of transition metals are known, for example, from EP 0544490, page 2, line 4, to page 3, line 57, from WO 00/52124, p.5, line 9, before p.8, line 7, and from p.8, line 19, to page 11, line 14, from WO 04/039932, page 2, line 25, to page 10, line 21, from WO 00/12808 with p.6, line 29, to p.33, line 29, from WO 00/60043, p.6, line 9, to p.17, line 22, from WO 00/27975, p.2, lines 1-18 and p.3, line 7, to page 4, line 6, from WO 01/05925, p.1, line 28, to page 3, line 14, from WO 99/64156, page 2, line 25, to p.9, line 18, and also from GB 2309976, p.3, line 1, to p.8, line 32.

In the structure proposed in the invention detergents may include further enzymes that enhance detergent, respectively, the cleaning action, especially lipase, cutinase, amylases, neutral and alkaline protease, esterase, cellulase, pectinase, lactase, and/or peroxidase. While enzymes for their protection laid out what I can be adsorbed on carriers or encapsulated in forming the shell substance.

The proposed invention in detergents and cleaners may contain, in addition, chelating agents, which form coordination compounds with transition metals and to prevent catalytic decomposition of active oxygen compounds in the washing solution, respectively, in an aqueous solution of the detergent. As such chelating agents can be used, for example, phosphonates, such as hydroxyethane-1,1-diphosphonate, nitrilotriethanol, diethylenetriaminepenta(methylenephosphonate), ethylenediaminetetra(methylenephosphonate), hexamethylenediaminetetra(methylenephosphonic) and their salts with alkali metals. Equally as chelating agents can also be used nitrilotriacetic acid and polyaminocarboxylic acid, primarily ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, Ethylenediamine-N,N'-centernow acid, methylpyridoxine acid, polyaspartate, as well as their salts with alkali metals and ammonium salts. As chelating agents in the composition proposed in the invention as detergents can further include polyhydric carboxylic acids, especially hydroxycarbonate acid, primarily tartaric acid and citric acid.

The proposed invention in detergents additionally could the t to contain inhibitors Pomerania (antiresonance), holding in suspended form is separated from the treated fibers pollution and thus preventing their re-settling or deposition on them. As an example, suitable for use in the proposed invention in detergents inhibitors Pomerania can be called ethers of cellulose, such as carboxymethylcellulose and its salts with alkali metals, methylcellulose, hydroxyethyl cellulose and hydroxypropylcellulose. Similarly you can use and polyvinylpyrrolidone.

Proposed in the invention, the detergents and cleaning agents can contain further defoamers, suppressing the formation of foam in the water washing, respectively, a cleaning solution. As an example, suitable for use in the proposed invention in detergents and cleaning agents defoamers can be called organopolysiloxane, such as polydimethylsiloxane, waxes and/or wax, as well as their mixtures with highly dispersed silicic acids.

In the structure proposed in the invention detergents if necessary, you can include optical brighteners, deposited on the fibers that absorb the radiation of the UV region of the spectrum and emits blue fluorescence, corrective yellowing of the fibers. As an example, suitable for use in the proposed invention in detergents op is practical bleach can be called derivative diaminodiphenylsulfone, such as formed with an alkali metal salt of 4,4'-bis-(2-aniline-4-morpholino-1,3,5-triazinyl-6-amino)stilbene-2,2'-disulfonate, or substituted definitiely, such as formed with an alkali metal salt of 4,4'-bis-(2-colfosceril)of diphenyl.

The proposed invention in detergents and cleaners can also contain perfumes and dyes.

The proposed invention in detergents and cleaners in liquid form or in the form of gels may additionally contain up to 30 wt.% organic solvents, such as methanol, ethanol, n-propanol, isopropanol, n-butanol, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butyleneglycol, glycerin, diethylene glycol, methyl ether of ethylene glycol, ethanolamine, diethanolamine and/or triethanolamine.

Compared to detergents and cleaners without covered proposed in the invention the shell of the particles percarbonate sodium proposed in the invention detergents and cleaners have better storage stability with less loss of active oxygen during storage in humid conditions.

In one of the preferred embodiments of the invention proposed therein cleaners are the means for washing the dishes in the dishwasher, which in the preferred embodiment, presented in the form of tablets and costoriented proposed in the invention coated particles percarbonate sodium can also contain a corrosion inhibitor silver. Such corrosion inhibitors silver refers to tools that prevent or reduce the fading of non-ferrous metals, primarily silver (education they brushed plaque), when washing is made of them, Cutlery and crockery in the dishwasher relevant, intended for the purpose. For applications such as corrosion inhibitors of suitable silver compounds from the group of triazoles, benzotriazoles, dibenzothiazyl, aminotriazoles and alkylaminocarbonyl. Compounds of these classes can be substituted with such substituents as, for example, linear or branched alkyl group with 1-20 carbon atoms, and vinyl, hydroxyl, tirinya or halogen residues. Among dibenzothiazyl preferred compounds in which each of the two benzotryazolyl groups attached at position 6 through the group X, where X can be a bond, a linear, optionally substituted one or several C1-C4alkyl groups alkylenes group, preferably with 1-6 carbon atoms, cycloalkyl residue with at least 5 carbon atoms, carbonyl group, sulfonyloxy group, oxygen atom or sulfur. Particularly preferred corrosion inhibitor silver is tolyltriazole.

Examples

Obtain coated particles percarbonate sodium

To obtain coated particles percarbonate sodium particles as the source used particles percarbonate sodium, which has been described in EP 0716640 way by granulation in the fluidized bed of an aqueous solution of hydrogen peroxide and an aqueous solution of soda and the average diameter of x50particles which were 0,78 mm when the content is less than 2 wt.% the fine fraction of particles of size less than 0.2 mm Shell such particles inflicted described in EP 0863842 (section [0021]) by spraying 20%by weight aqueous solution forming the shell of the substances in the fluidized bed at the temperature of 55-60°C with simultaneous evaporation of water and subsequent drying for 30 min at temperatures up to 90°C. are Shown in table 1 in mass percent data on the amounts forming the shell of substances correspond to the total rasparennouu number excluding water of crystallization in terms of the total number of used particles percarbonate sodium and forming a shell of substances.

The storage stability in the composition of detergent

To determine the stability of the obtained above by particles percarbonate sodium storage in the composition of detergent 405 g zeolite-containing Universalna the detergent IEC-A* BASE (firm wfk-Testgewebe GmbH, Krefeld, Germany) were mixed in eccentric mixer with 15 g of TAED and 80 g percarbonate sodium for at least 10 minutes the mixture was then placed in a saturated water-repellent box format E2 for packing washing powder (19×14×4.5 cm), which were sealed with hot glue curing. Then washing powder kept in a climatic chamber at a temperature of 35°C and 80%relative humidity. After this washing powder was removed from the climatic chamber, cooled to room temperature and the contents of the box using the appropriate divisor of samples was divided by the sample mass 12, the Content of active oxygen before and after storage was determined in the usual way by permanganate. On the basis of the received data on the content of active oxygen before and after 8 weeks of storage was calculated percentage residual content of active oxygen (residual content OA), which was taken as a measure of the stability of the particles percarbonate sodium storage in the composition of detergent (see table 1).

Table 1
The stability of the coated particles percarbonate sodium storage in the composition of washing powder
The composition of the shell mass partsStability during storage, depending on the relative mass shell [residual content of OA in %]
4 wt.% forming a shell of substances3 wt.% forming a shell of substances2 wt.% forming a shell of substances
Na2SO4100*514843
Na2SO4/NaBO2of 99.5:0.5 to595437
Na2SO4/NaBO299:l625145
Na2SO4/NaBO297,5:2,5715946
Na2SO4/NaBO295:5815953
Na2SO4/NaBO290:1079
Na2SO4/NaBO280:2076
Na2SO4/NaBO250:50*71
Note: *an example is not relevant to the invention.

The same experiments were performed using particles percarbonate sodium, coated, consisting of 95 wt. parts of sodium sulfate and 5 wt. parts of metaborate sodium, respectively sheath consisting only of sodium sulfate when spraying this form the shell of the substance in the amount of 4 wt.% with a constant speed equal to 11 g/min, and by varying their concentration in the spray solution in the range from 15 to 30 wt.% (see table 2).

Table 2
The stability of the coated particles percarbonate sodium storage in the composition of detergent
The shell composition in wt. partsStability during storage, depending on the concentration of the spray solution [to a residual content of OA in %]
1 wt.% 20 wt.%25 wt.%30 wt.%
Na2SO4100*45534344
Na2SO4/NaBO295:583797463
Note: *an example is not relevant to the invention.

1. Particles percarbonate sodium, coated, characterized in that the shell contains anhydrous sodium sulfate in an amount of from 70 to 99.8 wt.% and sodium borate in an amount of from 0.2 to 20 wt.%, and the mass fraction of the shell varies from 1 to 10% based on the whole mass of one particle of percarbonate sodium.

2. Particles percarbonate sodium according to claim 1, characterized in that the content of sodium borate in the shell is less than 10 wt.%.

3. Particles percarbonate sodium according to claim 1, characterized in that the boron content in terms of the whole mass of one particle of percarbonate sodium ranges from 20 to 700 hours/million

4. Particles percarbonate sodium according to claim 1, characterized in that the shell contains sodium carbonate, sodium bicarbonate or mixtures thereof in amounts of up to 25 wt.%.

5. H is Stacy percarbonate sodium according to claim 1, obtained in the fluidized bed by spraying it an aqueous solution containing dissolved therein sodium sulfate and sodium borate, with the evaporation of this water.

6. Particles percarbonate sodium according to claim 5, characterized in that the content of dissolved salts in the sprayed aqueous solution does not exceed 25 wt.%.

7. Particles percarbonate sodium according to claim 5 or 6, characterized in that the aqueous solution is sprayed on the particles percarbonate sodium obtained by granulation in the fluidized bed of an aqueous solution of hydrogen peroxide and sodium carbonate.

8. Detergent containing particles of percarbonate sodium according to one of claims 1 to 7.

9. Cleaning agent containing particles of percarbonate sodium according to one of claims 1 to 7.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to a bleaching system for household textile items containing at least one bleaching agent, where the bleaching system is selected from peroxybenzoic acid, peroxy-6-naphthoic acid, peroxylauric acid, peroxystearic acid, phthalimido peroxycaproic acid, 6-phthalimido peroxyhexanoic acid, nonylimido peroxyamber acid, nonylimido peroxyadipic acid, 1,12-diperoxydodecanoic acid, 1,9-diperoxyazelaic acid, diperoxyisophthalic acid and 2-decyldiperoxybutane-1,4-diacid and coated by a shell in form of a layer of a polymer with urethane and urea groups, where a prepolymer with terminal NCO groups is obtained from macrools, ionic or potentially ionic polyols and polyisocyanates used in excess, said prepolymer being subjected to reaction with compounds which contain at least two amine groups which are reactive towards isocyanate with ratio of NCO groups to NH groups less than or equal to 1:1, after which said polymer is obtained via neutralisation.

EFFECT: obtaining a novel bleaching system.

11 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: cleaning compositions contain organic catalysts having improved enzyme compatibility and having the following formulae: where each R1 independently denotes a branched alkyl group selected from a group comprising 2-butyloctyl, 2-pentylnonyl, 2-hexyldecyl, isodecyl, isotridecyl and isopentadecyl, or a linear alkyl group containing 11-18 carbon atoms. The composition also contains one or more auxiliary ingredients.

EFFECT: cleaning compositions with efficient bleaching at low water temperature.

15 cl, 16 ex

FIELD: chemistry.

SUBSTANCE: synthetic detergent with low environmental hazard contains sodium tripolyphosphate, anionic surfactant - sodium soap based on high fatty acids, carboxymethyl cellulose, sodium silicate, optical bleaching agent, fragrance component, sodium sulphate and water. The detergent also contains a nonionic surfactant - oxyethylated fatty alcohols, collagen dissolution products obtained by using leather production wastes (leather cuttings), sodium perborate and sodium carbonate. All components are taken in a defined ratio.

EFFECT: invention enables production of a synthetic detergent with low environmental hazard, good detergent action and low foaming capacity.

3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to pellets which contain diacyl peroxide particles inside a matrix, a method of preparing such pellets and detergents containing such pellets. The pellets contain a matrix made from at least one metal ion-cross-liked polysaccharide and diacyl peroxide particles put inside the said matrix. The pellets are obtained through drop-wise addition of an aqueous suspension in which diacyl peroxide particles are suspended and in which at least one metal ion-cross-linked polysaccharide is dissolved to a solution which contains polysaccharide cross-linking metal ions.

EFFECT: obtaining pellets in which diacyl peroxide is in a form which ensures its reliable production and storage.

11 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to aqueous liquid compositions for bleaching, cleaning and disinfecting surfaces. The invention describes an aqueous liquid bleaching composition which contains hypochlorite, a quaternary ammonium salt of formula: R1R2R3R4N+X-, where R1 - C10-C20 alkyl; R2, R3 and R4 - C1-C3 alkyl; X is an inorganic anion, and a viscousifying system which contains an amine oxide as a surfactant and a fatty acid. Described also is a method of imparting prolonged antibacterial activity on a solid surface using the said composition and a container for preparing the said composition.

EFFECT: obtaining a composition which retains its activity and stability during storage for 4 weeks.

16 cl, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: cleaning compositions contain organic catalysts having the formula (i), (ii) given in the formula of invention, or mixtures thereof. In the formula G is selected from -O-, -CH2O-, -(CH2)2- and -CH2-, R1 is selected from H or C1-C4 alkyl, each R2 is independently selected from C4-C8 alkyl, benzyl, 2-methylbenzyl, 3-methylbenzyl, 4-methylbenzyl, 4-ethylbenzyl, 4-isopropylbenzyl and 4-tert-butylbenzyl.

EFFECT: improved compatibility of organic catalysts with enzymes.

18 cl, 18 ex

FIELD: chemistry.

SUBSTANCE: described is an aqueous liquid bleaching composition which contains a hypochlorite salt in amount sufficient for providing 0.0014-1.4 mol/l of hypochlorite ions, and an N-chloro-compound with pH higher than 7, which is selected from N-chloroarylsulfonamides and N-chlorimidodisulphate salt, where the composition contains at least one surfactant. Also described is a container which contains the said composition and a method of treating a solid surface using the said composition.

EFFECT: prolonged antibacterial activity on a solid surface.

11 cl, 3 tbl, 5 ex

FIELD: textile industry.

SUBSTANCE: method includes stage of article washing with detergent solution, which contains organic polymer, having spinnability, with average molecular weight of 1500000 or more, and where 60 mol % or more of its component monomers contain sulfonic acid group, or form of its salt, or sulfuric acid group, or form of its salt, provided that polyethylene oxide is unavailable. Invention also describes the following: method of hand washing, including stage of hand washing of laundry item with specified detergent solution, or washing solution produced by dissolution of detergent solution with more than 1-1000-multiple amount of water; and versions of detergents. Suggested washing solution may be used for hand washing.

EFFECT: improved smoothness of articles in process of washing and hand care, reduced unfavorable factors of squeaking, rough texture and physical fatigue in process of hand washing.

19 cl, 2 tbl, 11 ex

FIELD: chemistry.

SUBSTANCE: invention refers to sodium percarbonate particles. According to the invention the coated sodium percarbonate particles possessing the inner shell layer including as basic component at least one inorganic hydrate-forming salt and outer shell layer including alkali metal thiosulphate, alkali-earth metal thiosulphate and/or ammonium thiosulphate are described. The method of such sodium percarbonate particles preparation and application of these particles as bleaching agent in detergents and cleansers are also the subjects of an invention.

EFFECT: increasing of stability of sodium percarbonate particles in detergents and cleansers during storage.

23 cl, 4 dwg, 4 tbl

FIELD: chemistry.

SUBSTANCE: detergent contains the components as follows, wt %: anionic surface active agent (SAG) - alkylbenzol sodium sulphonate 10-16; nonionic SAG - oxyethylated fatty alcohols or oxyethylated alkylphenol 2-5; sodium tripolyphosphate 15-25; organophosphonate compound - sodium salt 1-hydroxyethylidene of phosphonic acid or sodium diethylentriaminopentaxys-(methylene phosphonate) 0.2-0.6; polycarboxylate 0.5-1.5; carboxymethyl cellulose 0.3-0.6; modified polyalkylene glycol 0.2-0.6; optical bleaching agent 0.05-0.3; soda ash 3-6; liquid glass 3.5-6.0; enzyme 0.4-0.7; defoaming agent 0.05-1.5; aromatiser 0.15-0.3; sodium sulphate and water to 100.

EFFECT: higher efficiency of bleaching detergent, all type decontamination with additional softening of fabric and without irritation of hand skin during manual washing, lower temperature modes of washing, reduced damage effect on metal parts of washing machines.

10 cl, 2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to sodium percarbonate particles. Essence of invention: described are particles of sodium percarbonate, provided with coating and consisting of main particles of sodium percarbonate, surrounded with at least one layer of coating, possessing long storage stability, expressed as amount of released heat at 40°C, measured after 12-week long storage at temperature 40°C, which constitutes less than 5 mcW/g. Subject of invention also are sodium percarbonate particles, provide with coating and consisting of main particles of sodium percarbonate, surrounded with at least, one layer of coating, possessing long storage stability, expressed as preservation of available oxygen content after 8-week long storage at temperature 55°C, which constitutes at least 70%. Also subject of invention are method of said sodium percarbonate particles production and application of said particles in detergent compositions as bleach, and detergent compositions, containing described sodium percarbonate paprticles.

EFFECT: creation of sodium percarbonate particles possessing increased long storage stability.

14 cl, 2 ex, 4 dwg

FIELD: chemistry.

SUBSTANCE: invention refers to sodium percarbonate particles. According to the invention the coated sodium percarbonate particles possessing the inner shell layer including as basic component at least one inorganic hydrate-forming salt and outer shell layer including alkali metal thiosulphate, alkali-earth metal thiosulphate and/or ammonium thiosulphate are described. The method of such sodium percarbonate particles preparation and application of these particles as bleaching agent in detergents and cleansers are also the subjects of an invention.

EFFECT: increasing of stability of sodium percarbonate particles in detergents and cleansers during storage.

23 cl, 4 dwg, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention concerns chemical bleaches applied in cleansers and detergents. Invention claims sodium percarbonate granules with coating of high storage endurance, including a) core obtained by dispersion granulation in pseudoliquefied layer with sodium percarbonate as main component, b) internal coating layer with non-organic hydrate-forming salt as main component, selected out of group including sodium sulfate, sodium carbonate, sodium bicarbonate, magnesium sulfate and mixes or mixed salts of these compounds, and c) outer coating layer with surfactant containing sulfate or sulfonate groups in the form of alkaline metal, alkaline-earth of ammonium salt, as main component.

EFFECT: enhanced storage endurance, high stability and active oxygen content in percarbonate granules.

22 cl, 1 ex

FIELD: technological process.

SUBSTANCE: invention may be used in all fields of engineering, in which application of disinfectant solutions is required, in particular, in medicine, food industry and others. Method of disinfectant preparation includes supply of water solution of alkaline metal carbonate in anode chamber of diaphragm electrochemical cell with cylindrical coaxial electrodes and coaxial ceramic ultra-filtering diaphragm, supply of fresh water in cathode chamber of the same cell and disinfectant drain from anode chamber. Solution of alkaline metal carbonate and water are supplied in anode and cathode chambers of cell with counter-flow. Process is carried out during current conduction via diaphragm mainly with alkaline metal ions. Disinfectant prepared by treatment of water solution of alkaline metal carbonate with concentration of 0.2-2 g/l in anode chamber of electrochemical diaphragm cell with coaxial electrodes and coaxial ultra-filtering ceramic diaphragm, contains peroxide compounds that are in metastable condition and has pH of 6-7.

EFFECT: invention allows to prepare efficient disinfectant that does not contain chlorine, in required quantity at site of consumption with reduction of costs for its manufacturing and usage.

6 cl, 1 dwg, 4 ex

FIELD: chemical industry; production of sodium percarbonate and other chemical products.

SUBSTANCE: the invention is pertaining to the field of chemical industry and may be used in production of sodium percarbonate (SPC) and other chemical products, where the synthesis process is combined with the synthesized product granulation. The granulated sodium percarbonate is produced by the steady growing-up of the products of interaction of the stabilized water solutions of the soda and hydrogen dioxide on the inoculation particles-granules. To chokes give torrents of The streams of the stabilized water solutions of soda and hydrogen dioxide are fed into the reactors at keeping the time of their interaction from 5 up to 21 sec and concentration of the sodium carbonate and the hydrogen dioxide in the ratio of 1 : 1.45-1.57. The produced reaction mass in the form of a solution is fed into the mixers-granulators, where it is distributed along the surface of the inoculation particles of sodium percarbonate, moisten and saturate them within 12-25 seconds up to achieving the average humidity of 6-12 mass %. Then the wet granules are brought out into the drying room on the gas-distributing grate, on which there is a slotted clearance with the gas-feeding channel, formed as a semi-circled groove on the gas-distribution grate and the upper end of the inclined chute. The feeding of the heated flue-gases is exercised under the gas-distribution grate through the gas duct, in which there is an erected septum being the prolongation of the upper wall of the channel and separating up to 6 % of total volume of the fed flue-gases, which are coming in through the channel with adjustment of the speed of their passage through the slotted clearance into the drying room, where they form a gas curtain in the form of the semi-tabernacle, in which the dried granules are classified according to their flying speeds in such a manner, that granules with the diameter less than the preset dimension, for example 500 microns, are carried out by the two equivolumetric streams formed by splitter made in the form of a triangular prism, to the windows and are def into the mixers-granulators as the recycle for a following cycle of granularity, and the granules with the diameter exceeding the preset lower limit, for example - 500 microns and above, fall through the gaseous curtain and on the inclined chute through the outlet window get into the classifier for the final classification according to the high limit of the preset fractionized composition of the final product, for example 800 microns. From the intermediate part of the classifier the granules the preset fraction are delivered for storage. The production output of the granules of the preset fraction, for example, 500-800 microns, is up to 99 %, the bulk weight is 1093-1138 kg/m3, the contents of the active oxygen is - 13.94-14.1 %, stability is 55.91-56.83 %. The invention allows production of sodium percarbonate with the preset range of the composition of the granules without reduction of productivity of the installation.

EFFECT: the invention ensures production of sodium percarbonate with the preset range of the composition of the granules without reduction of productivity of the installation.

9 cl, 2 tbl, 4 dwg

FIELD: chemical industry; methods and devices for production of sodium percarbonate with a stabilizing coating.

SUBSTANCE: the invention is pertinent to the field of chemical industry, in particular, to the method and the device for production of sodium percarbonate with a stabilizing coating and may be used in the production of the oxygen-containing bleaches made on the basis of sodium percarbonate (SPC), which is also applied as a component of synthetic washing agents (SWA). The initial solutions of hydrogen peroxide and sodium are brought in contact with the recycle made in the form of the SPC granules in the mixer, dry in the boiling layer in the driers, a part of the granules are fed into the classifier for separation by the granules size for separation of the granules of the target fraction, the remaining part of the granules are directed back in the mixer in the capacity of the recycle. The target fraction of the SPC granules is in series collected in the storage containers and subjected to vacuumization. Simultaneously the stabilizing agent is subjected to the vacuumization in the measuring containers. The so treated SPC granules and the solution of the stabilizing agent are brought in contact in the additional mixer first at the residual pressure of no more than 25 kPa with the following heighten of the pressure up to no less than 95 kPa or to the atmospheric pressure and dry in the additional drying machine of the boiling layer. At that the finish product stability achieves to 66.0-72.0 %, consumption of the coating material - to 0.9-2.8 weight/weight %, the contents of the active oxygen - 13.8-14.1 mass %. The technical result is the increased stability of the granulated sodium percarbonate with the stabilizing coating.

EFFECT: the invention ensures the increased stability of the granulated sodium percarbonate with the stabilizing coating.

8 cl, 2 tbl, 2 dwg

FIELD: chemical industry.

SUBSTANCE: proposed method includes delivery of aqueous solution of hydrogen peroxide and soda from reservoirs of 1 and 2 to reactor 3. Reaction mass thus obtained is delivered to double-screw mixer 6 communicated with drier 7. Part of dried granules is returned from drier 7 to mixer 6 and other part is directed to classifier 8; fraction at size of particles from 0.1 to 1.00 mm is directed from intermediate part of said classifier to storage reservoir 9 for target fraction granules. Then, granules are fed to vacuum drier in the scope of no more than 50% of its inner volume. Solution preparation unit 37 is used for preparation of aqueous solution of stabilizing agent- sodium, sodium sulfate, sodium carbonate, sodium silicate or their mixtures. Concentration of stabilizing agent solution is 5-15 mass-% and volume is 0.215-0.235 of volume of granules. Vacuum drier 11 and measuring reservoir 10 are evacuated simultaneously to residual pressure not exceeding 13.33 kPa. Granules are evacuated at heating to 55°C and are mixed with stabilizing agent solution first in vacuum followed by jumpwise rise of pressure to atmospheric level or to excessive pressure of 10 kPa; procedure is continued for 0.5-1.0 min. Then vacuum drying is performed at constant or periodic mixing. Moisture content of finished product doe not exceed 1.05% at stability of 59.93-65.74%.

EFFECT: enhanced efficiency.

12 cl, 1 dwg, 1 tbl

FIELD: food industry; production of oxygen-containing bleaching agents and synthetic detergents.

SUBSTANCE: the invention is intended for a chemical industry and may be used at production of oxygen-containing bleaching agents and synthetic detergents. The method provides, that solid particles of the paroxysmal are exposed to vacuumizing at a residual pressure of no more than 13.33 kPa, mainly at 0.67÷8.5 kPa with simultaneous heating up to 55°C, up to 40÷50° C. Then it is treated with a noble gas at atmospheric or excessive pressure of no more than 10 kPa. The mass share of active oxygen (in mass %) is no less than 14.00, stability of the finished product is no less than 59,92 %.

EFFECT: the invention ensures a high stability of alkali metals peroxisalts.

4 cl, 1 dwg, 1 tbl

FIELD: chemical industry; a method and a device of alkali metals peroxysalts stabilization.

SUBSTANCE: the invention is intended for a chemical industry and may be used at production of oxygen-containing bleaching agents and synthetic detergents. In the vacuum drier 3 supplied with a rake-type rabble 10 and a weight-measuring device 12, the main original material is supplied from a reserve tank 1. Then it is vacuumized simultaneously with the solution of a coating material located in a measuring container 17, connected by lines 21, 22 and 13 with the device of a dryer 3 vacuumizing. Then mix the main original material with the solute of the coating material at a residual pressure of no more than 13.33 kPa. Increase the pressure in the vacuum drier 3 up to the atmospheric pressure or exceeding it by no more than 10 kPa spasmodically by an air supply from a source 28. The produced product is exposed to a vacuum drying up to the required moisture, making control of the moisture content by a change of the weight of the dryer 3 contents with the help of the weight-measuring device 12. Stability of the finished product is 59.0-69.0 %, consumption of the coating material - 0.9-1.8 mass %, the share of the active oxygen - 13.8-14.4 mass %.

EFFECT: the invention ensures production of oxygen-containing bleaching agents and synthetic detergents.

10 cl, 1 dwg, 2 tbl

FIELD: chemical industry.

SUBSTANCE: the invention is intended for a chemical industry and may be used in production of bleaching agents and washing agent, household chemical goods. The reactor (1) is fed with soda ash, for example in the form of a solution, through sleeves(5) and a link (7) and hydrogen peroxide solution through a link (6). The sleeves (5)allow to move the reactor (1) along the auger of the mixer (2). Humid granules of sodium percarbonate produced in the mixer (2) are removed through a connecting pipe (9) into a dryer (3) supplied with a gas-distributing lattice (10). One part of the dried granules through a connecting pipe (8) is fed back into the mixer (2), and other part through link (15) is fed into the qualifier (4). A commercial fraction of sodium percarbonate is removed through link (16) into a pneumatic classifier (20). The fine fraction through link (22) and through the cyclone separator (13) and link (14) is fed back into the mixer. The coarse fractions of sodium percarbonate from the qualifier (4) is fed through link (17) into the grinding machine (18). Crushed sodium percarbonate is mixed with the fine fractions and through the cyclone separator (13) and through link (14) is fed back into the mixer (2). The invention allows to decrease the share of a dust faction down to 0.10 - 0.63 % and losses at drying, to increase the share of active oxygen up to 13.91-14.01 % and stability of the finished product.

EFFECT: the invention ensures reduction of the share of a dust faction up to 0.10 - 0.63 % and losses at drying, an increase of the share of active oxygen up to 13.91-14.01 % and stability of the finished product.

4 cl, 1 dwg, 1 tbl

FIELD: chemical industry.

SUBSTANCE: the invention is intended for a chemical industry and may be used in production of bleaching agents and washing agent, household chemical goods. The reactor (1) is fed with soda ash, for example in the form of a solution, through sleeves(5) and a link (7) and hydrogen peroxide solution through a link (6). The sleeves (5)allow to move the reactor (1) along the auger of the mixer (2). Humid granules of sodium percarbonate produced in the mixer (2) are removed through a connecting pipe (9) into a dryer (3) supplied with a gas-distributing lattice (10). One part of the dried granules through a connecting pipe (8) is fed back into the mixer (2), and other part through link (15) is fed into the qualifier (4). A commercial fraction of sodium percarbonate is removed through link (16) into a pneumatic classifier (20). The fine fraction through link (22) and through the cyclone separator (13) and link (14) is fed back into the mixer. The coarse fractions of sodium percarbonate from the qualifier (4) is fed through link (17) into the grinding machine (18). Crushed sodium percarbonate is mixed with the fine fractions and through the cyclone separator (13) and through link (14) is fed back into the mixer (2). The invention allows to decrease the share of a dust faction down to 0.10 - 0.63 % and losses at drying, to increase the share of active oxygen up to 13.91-14.01 % and stability of the finished product.

EFFECT: the invention ensures reduction of the share of a dust faction up to 0.10 - 0.63 % and losses at drying, an increase of the share of active oxygen up to 13.91-14.01 % and stability of the finished product.

4 cl, 1 dwg, 1 tbl

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