Covered peroxide compounds with controlled release, method for their production, and their application

FIELD: chemistry.

SUBSTANCE: particles contain inner coating layer that consist of at least one hydrate-forming mineral salt, and outer coating layer, including 0.2-3 wt % alkali metal silicate with module more than 2.5, particularly 3 to 5. Outer layer is obtained using alkali metal silicate solution with alkali metal silicate concentration 2 to 20 wt %. Dissolution time can be extended by alkali metal silicate concentration lowering in solution used, coating material amount being the same. Dissolution time can be extended significantly according to coating layers sequence and solution concentration with low quantity of alkali metal silicate.

EFFECT: extension of dissolution time.

18 cl, 7 tbl, 18 ex

 

The invention relates to peroxide compounds with a coating, in particular to coated particles of percarbonate sodium, with at least two shell layers, which possess both a high stability of the active oxygen in the presence of detergent components, and controlled release, in particular a slow release of percarbonate sodium in the aqueous phase.

The invention also features a method of obtaining a characteristic of a certain kind of coated particles, such as particles of percarbonate sodium coated, in which it is possible to obtain coated particles with different time of dissolution, and the amount of shell material remains constant.

The invention also features the use of peroxide compounds with a coating, in particular of coated particles percarbonate sodium, as a bleaching component in detergents, bleaching compositions and cleaning compositions, in particular those that require slow release of active oxygen (Oasset) in the aqueous phase.

In this application the term "peroxide compounds" should be understood as denoting such powder-like substances in the aqueous phase of release of active oxygen. Their examples are percarbonate, perborate, persulfates, perphosphate prsilikat and solid peroxocarbonate acid,

Among the powdered peroxide compounds percarbonate sodium currently occupies a prominent position, and for this reason, the information below refers essentially to percarbonate sodium.

Percarbonate sodium (2Na2CO3·3H2O2) use as a component of active oxygen in detergents, bleaching compositions and cleaning compositions. Due to inadequate stability during storage of percarbonate sodium in warm and moist environments and in the presence of various detergents and cleansing agents, in particular silicate supplements, percarbonate sodium need to be stabilized against loss of active oxygen (Oasset). An essential principle of stabilization includes the environment of the particles percarbonate sodium single or multi-layered shell, each shell layer includes one or more inorganic and/or organic shell components.

Solid detergents, such as used for bleaching textiles in everyday life and in industry, in addition to the surfactant and inorganic and/or organic active additives and chemical bleach, such as, in particular, percarbonate sodium, in many cases include the enzyme. Universal detergent barely is and can do without the use of enzymes, because they can be achieved fast and gentle removal of different protective components of textile products, even at low temperature. Especially finds widespread application of proteases to remove protein-containing impurities, however, in ever-increasing quantities also use other enzymes, such as lipase, amylase, cellulase and cutinase, for which in each case define other specific tasks.

If sidezym enzymatic detergents good solubility of percarbonate sodium often acts as a disadvantage, since soon after the beginning of the washing process in the washing solution is present in high concentrations of active oxygen, which can weaken the action of several enzymes, including, in particular, a number of proteases. Accordingly, there is a need to percarbonate sodium delayed release of active oxygen for sidezym enzymatic systems.

In accordance with GB 174891 to improve the stability of the active oxygen containing Oassetcompounds, in particular those that also include percarbonate sodium, sprayed with a solution of liquid glass and dried. Liquid glass, ie, in other words, the mixture of alkali metal silicates, is also a shell component in the comparative examples of the method in accordance with DE-OS 2622610. Use a solution of liquid glass module (SiO2to Na2O) 3.3 and dry matter concentration of 27.5 per cent. However, it was found that the alkali metal silicates do not have sufficient stabilizing effect, even if the particles percarbonate sodium put a thick shell layer.

In accordance with DE-OS 2417572 increased stabilization can be achieved using a mixed inorganic salts, such as the combination of sodium sulfate and sodium carbonate. In accordance with DE-OS 2622610 further improve get more use in the coating as the third component of the silicate of an alkali metal. These are described products are, as has been established, rapidly soluble.

In accordance with US 4325933 for use as a shell component also acceptable magnesium sulfate. As you can see from WO 95/02555 and EP-A 0623553, magnesium sulfate as the sole shell component still does not meet the stability requirements imposed at this time regarding percarbonate sodium. The coating particles percarbonate sodium, described in the last two mentioned documents, respectively, includes, furthermore, in addition to magnesium sulfate or magnesium salt of carboxylic acid, salt of the alkali metal from the range, including carbonates, alkaline metal is low, the bicarbonates of alkali metals and sulfates of alkali metals, and as a third component is a silicate of an alkali metal, and these shell components can be in one or in several layers.

In the method in accordance with WO 95/02555 to obtain a separate layer silicate of the alkali metal use a solution of liquid glass module 3.5 and a high concentration, namely 37° the Boma. To obtain shell layers, which, in addition, include sodium carbonate, in addition to sodium silicate, use solutions in which the content of the alkali metal silicate is lower. Based on both this document and the documents referred to above, it is impossible to assume, in accordance with which the concentration of alkali metal silicate in solution, designed for spraying, could influence the time of dissolution them covered percarbonate sodium.

From EP 0623553 A1, it follows that with increasing amounts of sodium silicate dissolution rate of coated particles percarbonate sodium is reduced, in the case of the shell layer of the 1.5 wt.% sodium silicate is the time of dissolution was 3.5 min, in the case of a shell layer of a 12.5 wt.% sodium silicate and a thin layer of magnesium sulfate (1.5 wt.%) upstairs it was 9.0 minutes In this case to obtain the first, ie, in other words, he is th inner layer, used the solution of liquid glass with 2% SiO2but the module was not specified.

The creature described in WO 97/19890 is that percarbonate sodium with a single shell layer consisting essentially of sodium sulfate has adequate stability of the active oxygen, if the core material is prepared by spray granulation in the fluidized bed. Obtaining dense particles in fact led to several lower dissolution rate, but it was insufficient, as was established in order to adequately prevent the deactivation of enzymes.

To reduce deactivating effect of chemical bleaches in respect of enzymes in WO 96/23354 it was proposed to form the detergent composition so that under normal conditions was dissolved more than 80 wt.% detergent, but less than 70 wt.% percarbonate sodium. Use percarbonate sodium coating, and this coating is, for example, of low-melting organic substances, or percarbonate sodium obtained by spray granulation in the fluidized bed, the dissolution rate is below the rate of dissolution of percarbonate sodium, obtained from a conventional crystallization. In practice it was found that these systems are not entirely satisfactory due to inadequate sameline the release Of assetand/or other problems.

In detergents in accordance with WO 97/45524, which include surface-active cationic ester and adding the alkalinity of the system, it is also important to give the alkalinity of the system would be released in the aqueous phase of slowing down. The term "substance having an alkaline action" should be taken as denoting chemical bleaches, such as percarbonate sodium. As a means to reduce the time of dissolution consider the coating material, which itself has a low solubility in water, which can provide a slow release of percarbonate sodium. In addition to the organic shell components in this document as an acceptable implant components to increase the time of dissolution consider the sulfates of alkali metals and alkaline-earth metals. As was established at the creation of the present invention, the time of dissolution cannot be effectively reduced by the mentioned sulphate as the sole shell component.

In WO 97/45524 as the preferred coverage in order slow release of percarbonate sodium consider coating with sodium silicate module SiO2to Na2About in the range from 1.6:1 to 3.4:1, in particular equal to 2.8:1. Silicate of soda which I use in the form of an aqueous solution, and percarbonate sodium coated from it includes from 2 to 10 wt.%, in particular from 3 to 5 wt.%, sodium silicate in terms of percarbonate sodium coated. Instead of sodium silicate as an acceptable shell component for slow release of active oxygen also consider magnesium silicate. Instructions on how sodium silicate or magnesium silicate should be applied to percarbonate sodium, this document can be detected. Thus, in particular, there is no indication on the suitable concentration of a solution of silicate of alkali metal, which includes its use for coating percarbonate sodium. As already mentioned in the introduction, percarbonate sodium should also have a sufficiently high stability of the active oxygen, as things do not can be created by coating only of the silicate of an alkali metal.

EP 0992575 A1 also contains information about the possibility of increasing the time of dissolution of percarbonate sodium silicate of an alkali metal. At the same time from 0.5 to 30 wt.% the alkali metal silicate with a modulus greater than 3 and less than 5, or mixed with percarbonate sodium, or put him in the form of a shell layer. As an example, the shell layer contains 9 wt.% sodium silicate. To improve the stability of active oxygen in one or carried in the channels at shell layers can be optionally placed special hydroxycarbonate acid or dicarboxylic acid. The coating can optionally contain other known stabilizers of the series, including magnesium sulfate, sodium sulfate, sodium carbonate and sodium bicarbonate. Depending on the coating composition, the time of dissolution is in the range from about 2 to 300 minutes From the examples it is obvious that by using a solution of liquid glass module is less than 3, the dissolution rate can be reduced only moderately. Indicate the concentration at which it should use a solution of liquid glass to get percarbonate sodium coated and quite a long time of dissolution, in this document can be detected.

The time of dissolution can be increased by applying a layer of a silicate of an alkali metal on percarbonate sodium, if the shell material is to use a large amount of alkali metal silicate. However, the lack of percarbonate sodium covered by this way, is that when using the desired alkali metal silicate in large quantities of silicate of alkali metal contained in the coating, unsatisfactory dissolved in the washing solution, and such "shell" is able, therefore, to settle on linen for washing as Pomerania. Such undissolved components can also lead to the formation of undesirable pending the th in the washing machine.

The object of the present invention is to provide a powdered peroxide compounds with a floor, despite the presence of only a thin shell layer, release in water active oxygen with a slowdown.

The object is, in particular, the establishment of advanced particles percarbonate sodium coated that at the minimum possible amount of alkali metal silicate in the coating provide the highest possible slow release into the aqueous phase of percarbonate sodium.

In accordance with another object of coated particles, which are similar to particles percarbonate sodium can easily lose active oxygen in a moist and warm environment, in addition to the slow release, should have a sufficiently high stability of the active oxygen during storage in the container and in the presence of detergent components.

In accordance with another object of the invention is a method, which allows a simple way to obtain particles coated in accordance with the invention, such as, in particular, particles percarbonate sodium.

In accordance with another object of regulation of the process parameters without the use of increased amount of shell material during the coating particles percarbonate sodium necessary the IMO to ensure reliable regulation time of dissolution with a certain "window of time".

Another object is the creation of coated particles of peroxide compounds, in particular particles of percarbonate sodium coated that sidezym enzymatic detergents release active oxygen in relatively large quantities only when the enzymes have already completed the task.

It has been found that the dissolution rate percarbonate sodium coated the importance of not only the module of the liquid (soluble) glass, which should be used to cover percarbonate sodium, and the amount of alkali metal silicate in the coating, but also the concentration of alkali metal silicate in the solution of liquid glass, which must be applied, and advanced placement at least two shell components, one of which is responsible mainly for the stability of the active oxygen, and the second is responsible for regulating the time of dissolution, in at least two shell layers.

In addition, it was found that the concentration of alkali metal silicate in the solution of liquid glass, which is intended for use, can be widely vary the time of dissolution with the same amount of alkali metal silicate in the shell layer. With the same amount of alkali metal silicate in the coating time of the races is the its can be greatly increased, if the coating on percarbonate sodium is applied using an aqueous solution of alkali metal silicate, which instead of the concentration of alkali metal silicate, is equal to, for example, 20 wt.%, has, for example, concentration, comprising only 5 wt.%. With this unexpected effect may be made to the above objectives and other objectives that are apparent from the further description and examples.

According to the invention offers powdered peroxide compounds with a coating, in particular coated particles percarbonate sodium delayed release of active oxygen in the aqueous phase, comprising at least two shell layer on the core of peroxide compounds, in which the inner layer, which ranges from 2 to 20 wt.% in terms of coated particles includes at least one hydrocortisol inorganic salt, and the outer layer includes an alkali metal silicate with a modulus SiO2to M2(M denotes an alkali metal atom) is more than 2.5, in particular greater than 3, characterized in that the outer layer as a main component is from 0.2 to 3 wt.% in terms of coated particles of alkali metal silicate and obtained using an aqueous solution containing alkali metal silicate at a concentration of alkali metal silicate in the interval for the Les from 2 to 20 wt.%.

Dependent claims relating to covered particles, are preferred options, and in particular to particles of percarbonate sodium coated.

Coated particles percarbonate sodium in accordance with the invention may have a core percarbonate sodium, which is obtained in any desired way to obtain and may include stabilizers, which are known, such as magnesium salts, silicates and phosphates. The production processes, which are common in practice are, in particular, the so-called crystallization processes and the processes of spray granulation in the fluidized bed. In the crystallization processes of hydrogen peroxide and sodium carbonate is introduced into the reaction in the aqueous phase with obtaining percarbonate sodium, and after crystallization of the latter separated from the aqueous mother liquor. Although in earlier ways percarbonate sodium was vykristallizovyvalas in the presence of relatively high concentrations of inert salts, such as sodium chloride, were then described the ways in which crystallization may also occur in the absence of vicalvaro agent; for example, we can refer to EP-A 0703190.

During spray granulation in the fluidized bed when receiving percarbonate sodium water RA is solution of hydrogen peroxide and aqueous sodium hydroxide solution sprayed on the seed crystals percarbonate sodium, located in the fluidized bed, and at the same time water is evaporated. Pellets that grow in the fluidized bed, fluidized bed are selected in whole or classification. As an example, to spray granulation in the fluidized bed is the description of WO 95/06615.

Finally, percarbonate sodium that obtained by the method involving the introduction of solid caustic soda or its hydrate in contact with an aqueous solution of hydrogen peroxide and drying, can also serve as the core particles in accordance with the invention.

With regard to high internal stability of the core of percarbonate sodium in the presence of detergent components, it is particularly advisable when the average particle diameter exceeds 0.5 mm, and particularly preferably is in the range from 0.5 to 1 mm Suitable spectrum of particles essentially do not include particles less than 0.2 mm

In a preferred embodiment, the content of particles with a diameter less than 0.4 mm is less than 10 wt.%, especially preferably less than 5 wt.%.

The particle diameter percarbonate sodium, which cover at least two layers, only slightly greater than the core diameter of percarbonate sodium. Typically, the coating thickness of the core of percarbonate sodium generally is less than 20 μm. The thickness of this layer among the layers, h is the layer which is at least two, in the preferred embodiment is in the range from 2 to 15 μm, in particular from 4 to 10 μm. Since the amount of material of the innermost shell layer particles percarbonate sodium, covered in accordance with the invention, generally much higher than the number of the material of the outer layer comprising a silicate of an alkali metal, the thickness of the inner layer is also greater than the thickness of the outer layer comprising a silicate of an alkali metal.

The term "outer shell layer comprising alkali metal silicate" refers to either the outer shell layer coating comprising at least two layer or shell layer, which, in turn, may be covered and may cover one or more layers.

Although in the following description, the individual layers are denote by analogy with that given in the literature devoted to the art, it should be noted that the components of the layers located one above the other, can pass each other at least in the border zone. This at least partial penetration (penetration) is a consequence of the fact that during the coating of the particles percarbonate sodium, which have the inner shell layer, this shell layer, when he sprayed the solution, which contains the shell component (whom onanti) of the second shell layer, at least partially on the surface is dissolved.

The coating on percarbonate sodium applied by the method, which is known. In principle, the particles to which you want to apply the coating, one or more times so monotonously as possible, enter into contact with a solution containing one or more implant components, and simultaneously or subsequently dried. For example, in the introduction to the contact can be carried out on granulirovanii the stove or in the mixer, such as a drum mixer. The coating is particularly preferable to obtain a coating in the fluidized bed, in which the first solution containing shell component (s) for forming the innermost layer, and then a second solution containing shell component (s) for forming the outer layer, sprayed on percarbonate sodium or percarbonate sodium, covered by one or several layers, which is located in the fluidized bed, and simultaneously dried by a gas fluidized bed. Gas fluidized bed may be any desired gas, in particular air, the air heated directly flue gas and CO2in the interval from, for example, 0.1 to about 15% (net CO2), nitrogen and inert gases. You can refer to the documents provided is by the introduction a detailed description of the coating process in the fluidized bed.

Particles percarbonate sodium in accordance with the invention in the inner shell layer include at least one inorganic salt, which can form a hydrate. In addition, the inner shell layer may also include other inorganic salts and/or organic compounds which have a stabilizing action, such as alkali metal salts of carboxylic acids or hydroxycarbonic acids. In a particularly preferred embodiment, the inner shell layer includes one or more salts of a number, including sulfates, alkali metal carbonates, alkali metal bicarbonates, alkali metal borates, alkali metal and perborate alkali metals. Although these salts can be as lithium salts, and sodium salts and potassium salts, preferably the sodium salt.

In accordance with another variant, the inner layer may also include magnesium sulfate, either alone or in the form of a mixture with one or more of the aforementioned salts.

In accordance with a particularly preferred variant of the innermost shell layer being (mostly) includes sodium sulfate, which may also contain partially hydrated form. The term "essentially" should be understood as meaning that bicarbon is t or sodium double salt of sodium bicarbonate, such as sesquicarbonate or salt of Wegschaider (Wegscheider, may also be contained at least in the boundary layer between the core percarbonate sodium and the inner layer.

The innermost shell layer particles percarbonate sodium coated in accordance with the invention typically ranges from 2 to 20 wt.% in terms of percarbonate sodium coated. Specify the amount of shell material is the amount of shell in beshitrostny form. In a preferred embodiment, the inner shell layer is from 3 to 10 wt.%, particularly preferably 4 to 8 wt.%, in terms of percarbonate sodium coated and in terms of UN-hydrated form. Since the inner shell layer includes is able to hydrogenate itself inorganic salt, due to hydrate formation during storage in a humid atmosphere, the amount of shell material may increase.

Particles percarbonate sodium, covered in accordance with the invention, include at the inner layer of the one or more outer layers. One of these outer layers, preferably one that is directly on the inner shell layer is a layer in accordance with the invention, comprising a silicate of an alkali metal. Module alkali metal silicate in solution, with whom containing a series of silicate of alkali metal, used for formation of this layer exceeds 2.5 and in the preferred embodiment is in the range from 3 to 5, and particularly preferably in the range from 3.2 to 4.2. The module is the molar ratio of SiO2to M2O, in which M denotes an alkali metal atom and, thus, represents a lithium atom, sodium or potassium, or a mixture of alkali metal atoms. The preferred sodium silicate.

In accordance with a particularly preferred implementation of the invention, the outer layer comprising a silicate of an alkali metal is a layer, which essentially consists of a silicate of an alkali metal, particularly preferred sodium silicate. The term "alkali metal silicate", as can be seen from consideration of the module, should be accepted as the designation, which applies to all alkali metal silicates, which causes the average value of the specified module. A solution of silicate of alkali metal, intended for use as a sprayable solution, in the preferred embodiment, is a so-called solution soluble (liquid) glass, in particular a solution of sodium water glass.

If the inner shell layer includes components that have an alkaline effect, such as sodium carbonate, module layer silicate selecing the metal in the inner shell layer may be somewhat lower and, therefore, to reduce the time of dissolution, as cannot be excluded interaction between the components of shell layers at least in the border zone.

For formation of a shell layer comprising alkali metal silicate, as a gas fluidized bed or as propellent gas for spraying the solution containing alkali metal silicate, there is also the possibility to use gas enriched in CO2or net CO2. This means the pH of the solution of alkali silicate of the metal coating is reduced, resulting in increase of the module and, therefore, the time of dissolution of percarbonate sodium coated.

In accordance with a particularly preferred execution of the invention the inner shell layer consists essentially of (mostly) sodium sulfate, and adjacent the outer layer consists essentially of sodium silicate, the module which is in the range from 3 to 5, preferably from 3.2 to 4.2. In a particularly preferred embodiment, the inner shell layer comprises from 2 to 10 wt.% sodium sulfate (based on beshitrostno form), and the outer layer comprises from 0.3 to less than 1 wt.% sodium silicate with the above module is in each case calculated on percarbonate sodium coated.

Although particles Parker is onata sodium with at least two shell layers, one shell layer which comprises sodium silicate or essentially consists of sodium silicate in the art will known when creating the present invention was first established that a significant impact on the rate of dissolution of coated particles percarbonate sodium has a sequence of layers. Thus, in the method in accordance with the invention is essential that the layer containing the alkali metal silicate, was not directly on the core percarbonate sodium, and was placed as the outer layer, preferably as a second layer. Subject stacking order of the layers in accordance with the invention when the same amount of alkali metal silicate, the same module and the same concentration of the spray solution containing alkali metal silicate, can be derived products, which relieve percarbonate sodium in the aqueous phase significantly more slowly than products with reverse sequence of layers, such as is already known from the literature on this field of technology. Thus, by placing layers in accordance with the invention is already possible to obtain products with a long time of dissolution when a very small amount of alkali metal silicate in the shell layer. The technology is technology, known in the art, to achieve the same time dissolving need a much larger quantity of silicate. Using a smaller amount of alkali metal silicate with a simultaneous long delays in the release of percarbonate sodium creates an opportunity to resolve the problem Pomerania linen for washing.

Another advantage, which follows from the use of small quantities of silicate shell, is that due to the very thin shell layer of alkali metal silicate in the coating process in the fluidized bed can be formed only a relatively small amount of dust, including the alkali metal silicate. This small amount of dust can get in a continual process of obtaining percarbonate sodium spray granulation in the fluidized bed without negative changes of properties percarbonate sodium.

In the method in accordance with the invention, it is possible to use a solution of liquid glass normal quality, ie, in other words, you should not use specially purified, for example, depleted iron, a solution of liquid glass, because the shell layer comprising alkali metal silicate, is not directly on the core percarbonate sodium and is only a short to icesto dust.

Suppose that the sequence of layers in accordance with the invention is one of the reasons why you only need a small amount of alkali metal silicate. Obviously, when applying the inner layer produces a much smoother surface compared to the surface of the core of percarbonate sodium, resulting in dense (closed) effective shell layer can be obtained using a small amount of alkali metal silicate.

Another feature of coated particles percarbonate sodium, which is essential for carrying out the invention is the fact that to receive the outer shell layer comprising a silicate of an alkali metal, use an aqueous solution containing alkali metal silicate at a concentration in the range from 2 to 20 wt.%, preferably from 3 to 15 wt.%, and particularly preferably from 5 to 10 wt.% silicate of an alkali metal. In accordance with a particularly preferred coated particles percarbonate sodium in accordance with the invention is obtained using the solution of sodium liquid (soluble) glass in a concentration of from 2 to 20 wt.%, in particular 5 to 10 wt.%, and the module in the interval from 3 to 5, and preferably from 3.2 to 4.2.

Finally, it was found that the spraying speed, ie, friends and words, time spray for applying a predetermined amount of the alkali metal silicate has an impact on the time of dissolution: the increase in the time of spraying, you can increase the time of dissolution.

Coated particles percarbonate include sodium in the external layer of from 0.2 to 3 wt.% the alkali metal silicate with a modulus than 2.5 and preferably greater than 3. An even greater decrease in the amount of alkali metal silicate in principle possible, but the achieved effect of increasing the time of dissolution is only moderate. Similarly, if the special purpose of the application is required especially great time of dissolution, possibly increasing the amount of alkali metal silicate to the level above 3 wt.%, for example >3 to 5 wt.%.

In accordance with the preferred particles percarbonate sodium coated in the outer shell layer include from 0.2 to 1 wt.%, and preferably from 0.3 to less than 1 wt.% the alkali metal silicate, preferably sodium silicate. This product is particularly suitable for use in sidezym enzymatic solid detergents. Despite only a small thickness of the outer layer comprising alkali metal silicate, and it is very effective to increase the time of dissolution and, consequently, delayed release percarbonate sodium In the event that for example, the average particle diameter of 0.8 mm and the proportion of the layer of sodium silicate from 0.5 to 1 wt.% the thickness of the layer is equal to or less than 1 micron.

Particularly preferred coated particles percarbonate sodium, such as, in particular, those containing sodium sulfate in the form of the innermost shell layer is from 0.3 to less than 1 wt.% sodium silicate in the form of the outer shell layer, characterized by the time of the dissolution of more than 5 min, in particular more than 10 minutes At this time of dissolution means the time determined by conductometric control for 95%dissolution in water at 15°and a concentration of 2 g/L.

In addition to the most inner shell layer and the outer shell layer containing sodium silicate could be useful if an external layer containing a silicate of an alkali metal, which in the preferred embodiment, is a pure layer of sodium silicate coated particles have one or more shell layers, which can be dense (closed) or open (loose).

In accordance with a preferred variant of the shell component of the outer shell layer is a finely ground inorganic or organic engineering excipient, which is completely (tight) or partially closes the again of the particles. The presence of engineering excipients avoids the risk of caking of the particles percarbonate sodium, which in the inner shell layer have a layer mainly of silicate of an alkali metal. Especially acceptable engineering excipients are finely ground inorganic compounds from the series, including the oxides, mixed oxides and silicates; these substances can be of natural or synthetic origin.

Especially acceptable substances from nanosized particles, such as precipitated and pyrogenic silica, aluminium oxide and titanium dioxide, which may be either hydrophilic or hydrophobic. Among silicate substances as examples are mentioned pyrogene the resulting aluminosilicate and montmorillonite. Such substances have a preferred specific surface area according to BET of from 20 to 500 m2/g, allowing for efficient shell layer is sufficient only used a very small quantity of such substances.

Getting covered with particles, in particular particles of percarbonate sodium coating includes coating processes according to methods known, preferably by coating in the fluidized bed, and put at least two shell layers. This process is characterized with the fact, what to get an external shell layer comprising alkali metal silicate as a main component, use an aqueous solution containing alkali metal silicate with a concentration of alkali metal silicate in the range of from 2 to 20 wt.% module and SiO2to M2(M denotes an alkali metal atom) is greater than 2.5, and this solution is sprayed on the particles percarbonate sodium, which have at least one of the inner shell layer of the at least one hidrobrasileira shell component, in the fluidized bed with simultaneous evaporation of water up until not receive the outer layer comprising from 0.2 to 3 wt.% silicate of an alkali metal.

In accordance with the preferred option to obtain a shell layer comprising a silicate of an alkali metal, use a solution of alkali metal silicate with a modulus in the range from 3 to 5 and the content of alkali metal silicate in the range of from 2 to 15 wt.%, and in particular from 5 to 10 wt.%. In a preferred embodiment, such a solution, which in this case represents, in particular, a solution of sodium water glass, sprayed on the particles percarbonate sodium, comprising at least one of the inner shell layer, in an amount such that the outer shell layer comprised from 0.3 to 2 wt.%, preferably from 0 to 3 ... less than 1 wt.% silicate of an alkali metal, in particular sodium silicate.

In order for the performance installation for coating in the fluidized bed is not too much decreased by the use of dilute solutions of alkali metal silicates, the increase in the gas temperature fluidized bed and/or the rate of flow can be maintained constant, the duration of spraying. However, thanks to this event, the increase in time of dissolution may not be optimal.

In accordance with one variant of dense or open (loose) shell layer can be deposited on the outer shell, including the alkali metal silicate as a main component, by conventional coating in the fluidized bed.

In accordance with another and preferred engineering auxiliary substance may be deposited on the particles percarbonate sodium, covered with at least two layers, putting them in contact with very finely ground engineering auxiliaries. The number of used engineering excipients in the preferred embodiment, is significantly less than 1 wt.%, and especially preferably less than 0.5 wt.%. For example, there is a possibility to enter percarbonate sodium coated, which take away from the unit for applying cover the Oia, in contact with powdered engineering auxiliary materials in a vertical tube free fall or pipe for pneumatic transport, or in the mixer, and this auxiliary substance is adsorbed on the surface of coated particles percarbonate sodium.

According to the method in accordance with the invention there is the possibility to reliably obtain coated particles percarbonate sodium, which in the aqueous phase in the regulated mode, release percarbonate sodium and, consequently, the active oxygen. Thus the time of the dissolution of percarbonate sodium coated can be target by following the steps in accordance with the requirements of the application sidezym enzymatic detergent.

The invention also features the use in accordance with the invention, in particular of coated particles percarbonate sodium as a chemical bleach in detergents, bleaching compositions and cleaning compositions. These detergents, bleaching compositions and cleaning compositions constitute, in particular, those that include at least one enzyme. Such compositions in a suitable embodiment, comprise from 5 to 50 wt.%, preferably from 10 to 40 wt.%, and in particular from 15 to 25 wt.% percarbonate sodium, covered in accordance with the invention. Particles having Talivaldis action which is covered in accordance with the invention, can be used in detergents, bleaching compositions and cleaning compositions of any desired composition. Such compositions as main components include, in addition to the bleaching component, following.

Surfactants of the series, including cationic, anionic, nonionic and amphoteric (impolitically) surfactants.

Inorganic and/or organic supplements, the main action which includes the binding or complexation with metal ions that cause water hardness. Examples include zeolites, layered silicates, polyphosphates, aminopolyamide acid, aminophosphonate acid and policyabout acid.

Components having an alkaline action, such as alkanolamine; inorganic electrolytes, such as silicates, carbonates and sulfates.

The bleach activators from the series comprising N-acyl compounds and O-acyl compounds, such as tetraacetylethylenediamine (TAED) and nonanoyloxybenzenesulfonate (NOBS).

Enzymes, such as, in particular, lipases, cutinase, amylases, neutral and alkaline protease, esterase, cellulase, pectinase, lactase and peroxidase.

Other components of the composition, which can serve as stabilizers the La peroxides, such as, in particular, magnesium salts, additives that prevent re-deposition of dirt, optical brighteners, defoamers, disinfectants, corrosion inhibitors, perfumes, dyes and agents for regulating the pH.

The invention is further illustrated by the following examples.

The experiments demonstrate the unexpected influence of the concentration of a solution of sodium water glass on the formation of the outer shell layer, as a surprisingly significant effect due to the very thin layer of sodium silicate and the impact of the module and the sequence of layers.

Examples (General instructions)

In all cases, unless otherwise stated, percarbonate sodium with an average particle diameter of 750 μm and a content of fine particles (less than 200 microns) is essentially 0% covered first shell layer made essentially of sodium sulfate in the fluidized bed in accordance with WO 95/19890. In each case covered 1000 g percarbonate sodium, which had a shell layer of 6 wt.% sodium sulfate in terms of the covered product and per beshitrostno form. The product covered by this way, were covered with a solution of liquid glass in the coating in the fluidized bed (Strea 1 - Aeromatic), which received a second shell layer. The sputtering was carried out at temperature is re fluidized bed is about 60° C. as a gas fluidized bed used the air at the inlet temperature in the area about 100°C. After injection, the temperature of the air is slightly lowered and the subsequent drying was carried out at a temperature of fluidized bed 75°C.

Data on the quantities used, the module and the concentrations of sodium water glass, and about the time of the dissolution in minutes (2 g/l of water, 15°, conductometric determination of the 95%dissolution) can be seen in the following tables.

Examples 1 to 3

For coating solution was used liquid sodium (soluble) glass (Na-LGL), diluted with water and module 3,35. The concentration of the solution, designed for spraying varied. To prepare spray solutions used technically available solution Na water glass with a dry matter content of 36 wt.%. Percarbonate sodium, covered with one layer, in each case covered using 0.75% sodium silicate (with module 3,35).

Time dispersion in examples 1 to 3 in each case was approximately 20 minutes drive Time of dissolution as a function of the concentration of the spray solution are shown in table 1. It was found that with decreasing concentration of Na-LGL in the sprayed solution time of dissolution increases significantly, i.e. in other words, in the aqueous phase p is carbonate sodium is released from the coated product with increasing deceleration.

Table 1
Example No.The concentration of Na-LGL (wt.%)The time of dissolution (min)
1208,0
21014,8
3519,6

Examples 4 through 8

In the first stage, percarbonate sodium with the spectrum of particles larger than 0.4 mm was coated by use of sodium sulfate in the shell number in the interval from 3 to 6 wt.%. The product covered by this way, in each case in the second stage was coated using a solution of sodium water glass concentration of 10 wt.%, for the preparation of which is used technically available Na-LGL solution (nature, distinct from the nature in examples 1 to 3) with the module 3,34 and concentration of dry matter of 35.6 wt.%. The amount of sodium silicate in the shell layer in each case was 0.75 wt.%. The results are shown below in table 2.

Table 2
Example No.1st layer2nd layerThe time of dissolution (min)
The number of Na2SO4in the shell, wt.%The number of Na-LGL in the shell, wt.%
4*601.3
560,7511,0
650,7511,0
740,7513,3
830,7514.4V
* not in accordance with the invention

Examples 9 and 10

Percarbonate sodium coated with 6 wt.% Na2SO4(the innermost layer) was coated with use of respectively 1.5 and 3.0 wt.% sodium silicate. Used technically available solution of liquid glass, diluted to a dry matter content of 10 wt.%, module 3,34 and concentration of 35.6 wt.%. The results are summarized in table 3.

Table 3
Example No.The number of Na-LGL in the shell (wt.%)The time of dissolution (min)
91,535
103,080

Examples 11 and 12

Percarbonate sodium was initially covered with 0.75 wt.% sodium silicate (1st layer) from a solution of liquid glass module 3,4, and then covered 6 wt.% sodium sulfate (2nd layer). The layer of sodium silicate was obtained with the use of a sprayed solution is from 10 wt.% sodium silicate (module 3, 4). The sequence of layers in example A11 was not in accordance with the invention.

Percarbonate sodium example A12 in accordance with the invention, coated with two layers, were prepared using the same sprayable solutions and the same percarbonate sodium, but the sequence of layers was replaced reversed, that is, in other words, in accordance with the invention. Table 4 shows the results. The time of dissolution of the product sample, which was not in accordance with the invention, were found to be much shorter than the time of dissolution of the product of example in accordance with the invention.

Table 4
Example No.The sequence of layersThe time of dissolution (min)
111: Na-LGL; 2nd: Na2SO44,1
121st: Na2SO4; 2nd: Na-LGL11,0

Example 13

On percarbonate sodium coated with 6 wt.% Na2SO4(corresponding to example 4) in the fluidized bed deposited a solution of Na water glass concentration of 10 wt.%, made from technically available Na liquid glass module 4.1 and concentration of 28.5 wt.%, with the receipt of the second layer. The amount of shell material 2-layer was 0.75 in the AC.% sodium silicate.

The time of dissolution of the product of example 13 was 21 minutes Time of dissolution of the product prepared similarly, but using a solution of Na silicate with a modulus 3,34 (as in example 5) was 11 minutes So as to increase module the time of dissolution increases.

Examples 14 and 15

Technically available percarbonate sodium coated with 6 wt.% Na2SO4(Q35 company Degussa) was coated using a solution of sodium water glass concentration of 5 wt.%, made from technically available solution Na-LGL module 3.2 and concentration of dry matter (Na2O+SiO2) 32.9 wt.%. The amount of shell material and the time of dissolution below in table 5.

Table 5
Example No.Shell number Na-LGL (wt.%)The time of dissolution (min)
140,75a 21.5
150,5014,5

Examples 16 through 18

Technically available percarbonate sodium coated with 6 wt.% Na2SO4(quality 30 and 35, the products of the company-applicant) covered in pilot plant scale 150 kg using a solution of sodium water glass concentration of 10 wt.% this module is 3.2. The coating was applied anal is Gino method according to patent US 6239095. The number of shell of sodium silicate, the spectrum of particles and the time of dissolution below in table 6.

Table 6
Example No.QualityShell number (wt.%)The time of dissolution (min)D50(mm)D10(mm)D90(mm)
16Q300,7513,00,550,350,90
17Q350,5014,50,870,871,25
18Q350,75a 21.50,780,501,20

The products of examples in accordance with the invention are also delayed release of active oxygen (dissolved) due to the high stability of the active oxygen during storage, essentially defined by the inner layer.

Table 7 shows the stability of the products of examples 17 and 18, is covered with two layers and using Q35, when stored in a zeolite-containing detergent for heavily contaminated materials stored in containers for detergent P2 at 35°and at 80%relative atmospheres the second moisture. An unexpectedly large increase stability was achieved through the second layer of sodium silicate, although used on a small quantity and, consequently, the small thickness of the layer. Differences relative residual Ofassetin the examples A17 and P are within the interval of variation in the test and, therefore, both products had approximately the same stability.

Table 7
Example No.2nd layer silicate Na (wt.%)The relative residual Ofasset(%)Values for MTA (w/g)
after 4 weeksafter 8 weeks24 h/60°
Q350926923
170,50958411
180,75968211

Values for MTA (MTA indicates the monitor thermal activity) show that by applying a very thin layer of sodium silicate on Na-Pc (coated particles)coated with sodium sulfate, the value for MTA is very significantly reduced, to such an extent that it was impossible previde the ü. Therefore, significantly increases the internal stability of the coated particles.

1. Powdered peroxide compounds with a coating, in particular, coated particles percarbonate sodium delayed release of active oxygen in the aqueous phase, comprising at least two shell layer on the core of peroxide compounds, in which the inner layer comprising from 2 to 20 wt.% in terms of coated particles, essentially contains at least one or more salts of a number, including sulfates, alkali metal carbonates, alkali metal bicarbonates, alkali metal mixed salts of sodium carbonates, borates of alkali metals and perborate alkali metal, and the outer layer contains an alkali metal silicate with a modulus SiO2to M2More than 2.5, where M denotes an alkali metal atom, wherein the outer layer as a main component contains a silicate of an alkali metal in an amount of from 0.2 to 3 wt.% in terms of coated particles and obtained using an aqueous solution containing alkali metal silicate, at a concentration of alkali metal silicate in the range of from 2 to 20 wt.%.

2. Coated particles according to claim 1, characterized in that the outer layer is obtained using the solution of alkali metal silicate with a modulus in the range of the 3 to 5, in particular, from 3.2 to 4.2, and the concentration in the range from 3 to 15 wt.%, in particular, from 5 to 10 wt.%.

3. Coated particles according to one of claims 1 or 2, characterized in that the outer layer is obtained using the solution of sodium water glass diluted to a concentration of sodium silicate is from 2 to 20 wt.%, in particular, from 5 to 10 wt.%.

4. Coated particles according to claim 1, characterized in that the outer shell layer comprising alkali metal silicate contains from 0.3 to less than 1 wt.% silicate of alkali metal, calculated on the coated particles, and the time of dissolution (95%dissolution in water at 15°and 2 g/l) is more than 5 min, in particular more than 10 minutes

5. Coated particles according to claim 1, characterized in that the inner shell layer is from 2 to 10 wt.% per beshitrostno form and in terms of coated particles.

6. Coated particles according to claim 1, characterized in that they have two or three shell layer and the inner layer essentially contains sodium sulfate, and the layer on top of it essentially contains sodium silicates with a modulus in the range from 3 to 5.

7. Coated particles according to claim 6, characterized in that the innermost layer of sodium sulfate is essentially from 2 to 10 wt.%, and the outer layer essentially containing silicates of sodium, is from 0.3 to less than 1 wt.%, in each case, calculated on Richie particles.

8. Coated particles according to claim 1, characterized in that the external layer comprising or preferably essentially consisting of a silicate of an alkali metal, they have one or more additional solid or partially open shell layers.

9. Coated particles of claim 8, characterized in that they have neither the surface of finely powdered inorganic or organic engineering excipient, in particular, engineering excipient from a range that includes precipitated and pyrogenic silicon dioxide, which may be hydrophilic or hydrophobic, aluminum oxide, titanium dioxide, aluminosilicate, and montmorillonite.

10. Coated particles according to claim 1, characterized in that they have an average diameter from 0.5 to 1 mm, essentially do not contain particles less than 0.2 mm and covered with a coating in the fluidized bed.

11. Coated particles of claim 10, characterized in that they have a value of D10at least 0.35 mm, in particular at least 0.5 mm

12. Coated particles of claim 10, characterized in that the fraction Castel diameter less than 0.4 mm is less than 10 wt.%, in particular, less than 5 wt.%.

13. The method of obtaining powder of peroxide compounds with a coating, in particular of coated particles percarbonate sodium, according to one of claims 1 to 11, comprising applying the coating onto the astitsy, to be covered, such as, in particular, particles percarbonate sodium, in which particles enter into contact with an aqueous solution containing at least one shell component, and dried with the formation of at least two shell layers, characterized in that for obtaining the outer shell layer comprising as a main component an alkali metal silicate, using an aqueous solution containing alkali metal silicate with a concentration of alkali metal silicate in the range of from 2 to 20 wt.% module and SiO2to M2More than 2.5, where M denotes an alkali metal atom, and the solution sprayed on the particles, which have at least one of the inner shell layer of the at least one hidrobrasileira shell component, with simultaneous or subsequent evaporation of water up until the content of the alkali metal silicate in the outer layer will not reach the amount of from 0.2 to 3 wt.%.

14. The method according to item 13, wherein the sprayed solution of silicate of alkali metal, in particular, a solution of sodium liquid glass containing alkali metal silicate from 3 to 15 wt.%, in particular, from 5 to 10 wt.%.

15. The method according to item 13, wherein the particles of percarbonate sodium cause the innermost layer containing from 3 to 10 wt.% essentially sulfate n is sodium per beshitrostno form and in terms of percarbonate sodium coated, and then they sprayed a solution of sodium liquid glass essentially containing sodium silicate with a modulus in the range from 3 to 5 and the concentration of sodium silicate in the range of from 5 to 10 wt.%, and plating finish after application of 0.2 to 3 wt.%, in particular, from 0.3 to less than 1 wt.% sodium silicate.

16. The method according to item 13, wherein the outer layer comprising a silicate of an alkali metal, is applied by coating in the fluidized bed particles with at least one of the inner shell layer.

17. The method according to item 13, wherein percarbonate sodium, covered with the inner layer of the at least one capable of forming a hydrate salt and an outer layer of silicates of alkali metals as a main component, is introduced into contact with an effective amount of the powdery inorganic engineering excipients.

18. The use of peroxide compounds with a coating, in particular of coated particles percarbonate sodium according to one of claims 1 to 11 or obtained by the method according to one of p-17 as a bleaching component in bleaching compositions, detergents and cleaning compositions, in particular, those in which percarbonate sodium should be released in the aqueous phase of slowing down.



 

Same patents:

FIELD: process for treatment of textile materials, in particular, whitening of flax fiber for producing of hygroscopic wool used for medicine purposes.

SUBSTANCE: method involves subjecting flax fiber to oxidizing cooking followed by whitening with the use of hydrogen peroxide in the presence of stabilizing preparation based on oxyethylidene diphosphonic acid; after final rinsing, providing brightening processing, preferably with the use of solution containing higher fatty acid based softener used in an amount of 0.5-1.0 g/l. Method is realized in industrial plants with the use of proper equipment and chemical substances available and produced on industrial scale by home enterprises. Said method does not require substantial alterations in chemical processes.

EFFECT: increased whitening extent, capillarity and moisture absorbing capacity of wool produced.

2 tbl, 5 ex

FIELD: light industry, in particular, raw material dyeing processes used, for example, in whitening of mink skin fur hair.

SUBSTANCE: method involves providing additional tinning of skin with aqueous composition containing sodium chloride, composition based on low-molecular alcohol polyacetals, mixture of non-ionogen surfactants and cyclic terpenes; whitening for 2.0-4.5 hours with the use of aqueous composition containing sodium chloride, potassium persulfate, composition based on mineral and organic acids as pH stabilizers, mixture of primary fatty alcohols as protective admixture and 30%-hydrogen peroxide; providing reduction with the use of aqueous composition comprising sodium chloride, oxalic acid and mixture of non-ionogen surfactants with cyclic terpenes.

EFFECT: improved consumer properties of fur skins.

2 tbl

FIELD: light and fur industry.

SUBSTANCE: invention relates to a composition used for whitening hair cover of fur hides. The composition comprises sodium chloride, hydrogen peroxide, potassium persulfate, the composition based on mineral and organic acid salts - "Antikolor 1" or "Antikolor-2" as an agent for stabilizing pH value, and a mixture of primary saturated alcohols - "Antikolor-3" as a protective additive. The composition provides reducing the negative effect of leather and hair cover of hide. The composition can be used in raw-dye manufacture in treatment of hides with pigmented hair cover, for example, hides of karakul group.

EFFECT: valuable properties of composition.

2 tbl

FIELD: textile industry.

SUBSTANCE: composition contains hydrogen peroxide, aqueous ammonia, silicate-containing hydrogen peroxide stabilizer, nonionic or anionic surfactant, and water, said stabilizer being, in particular, taken separately or in various proportions to each other substances selected from group including kaolin, talc, bentonite, zeolite sorbent, and diatomite.

EFFECT: reduced loss in strength, felting tendency, and rigidity of textiles.

2 tbl, 6 ex

The invention relates to the treatment of textiles by washing or bleaching

The invention relates to the finishing of the textile industry

The invention relates to the textile industry, in particular to a method of bleaching fabrics

The invention relates to chemical technology of preparation of textile material, in particular to a method of bleaching textile material

The invention relates to chemical technology of bleaching textile materials of wool and silk fibers

FIELD: chemistry.

SUBSTANCE: invention concerns liquid detergent compositions with high stability during long-term storage. The liquid detergent composition includes fluid medium with water content up to 15 mass % and coated bleaching powder suspended in it. Dissolution time of the bleach is not less than 5 minutes; the bleach coating has at least two layers: inner layer includes one or more hydrate-forming non-organic salts as the main component, and outer layer comprises 0.2 to 5% of bleach and includes an alkali metal silicate with module of SiO2 to M2O (M is an alkali metal atom) over 2.5 as the main component. Preferable compositions include sodium percarbonate with an inner layer consisting mainly of sodium sulfate and an outer layer consisting mainly of 0.5 to 1.5 mass % of sodium silicate (with module of 3.2 to 4.2) as a bleach.

EFFECT: improved detergent efficiency and stability of the claimed composition.

14 cl, 3 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: invention pertains to compositions of granulated synthetic detergents, meant for manual and machine washing (in any type of machine) and soaking all types of textiles, including coloured and other household needs. The detergent contains the following components in the given % mass: anionic surface active agent sodium alkylbenzenesulfonate 9-12; non-ionic surfactant 2-5; sodium tripolyphosphate 15-30; dispergator 0.3-1.2; carboxymethyl cellulose 0.3-0.7; sodium silicate 3-6; modified polyalkylene glycol 0.2-0.6; enzyme 0.3-0.8; sodium carbonate 6-12; photo-bleaching agent 0.003-0.020; optical brightener 0.05-0.20; fragrance component 0.1-0.3; sodium sulphate and water up to 100. The non-ionic surfactant preferably contains oxyethylated monoalkylphenols based on propylene trimers or oxyethylated fatty alcohols. The dispergator used is sodium polyacrylate or sodium salt of a copolymer of maleic or acrylic acid or a sodium salt of a copolymer of acrylic, methacrylic and maleic acid. Alternatives of the synthetic detergent are also described.

EFFECT: increased effectiveness of the detergent, bleaching effect after washing, wider assortment of high quality granulated synthetic detergents.

7 cl, 1 tbl

FIELD: household chemistry, in particular compositions for bleaching of white and random dyeing textile made of natural, artificial, synthetic and mixed fibers.

SUBSTANCE: claimed composition contains (mass %): hydrogen peroxide 7-11; oxanole 0.5-1.0; oxyethylidenediphosphonic acid 0.1-0.3; optical bleaching agent, namely mixture of benzoxyzaryl derivative 0.1-0.2 and stilbenesulfo acid 0.1-0.2; and balance: water.

EFFECT: non-layered composition during storage; decreased chemical failure of materials.

2 tbl, 12 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a whitening composition comprising: (a) monomeric ligand or catalyst with transient metal of ligand of the formula (I): wherein R represents hydrogen atom; R1 and R2 are chosen independently from (C1-C4)-alkyl, pyridine-2-yl-methyl and (C2-C4)-alkylmethyl; X represents -C=O; R3 and R4 are similar and represent -(CH2)nC(O)O-(C1-C4)-alkyl; n = 0-4, and (b) equilibrating carriers and additional components. This composition is useful for catalytic whitening substrates with atmosphere oxygen. Also, invention describes a method for whitening the substrate involving applying step of the whitening composition on substrate in aqueous medium.

EFFECT: valuable properties of substances, improved whitening method.

11 cl, 2 tbl

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: laundry detergent useful in both hand laundry and washing machine.

SUBSTANCE: claimed synthetic detergent contains (mass %): surfactant 6,0-8,0 non-ionic surfactant 2-4; sodium tripolyphosphate 20; peroxide bleaching agent 10-15; carboxymethylcellulose (calculated as 100 mass % of base substance) 0.5; polycarboxylate 0.25-1.0; sodium silicate (calculated as SiO2) 3-5; soda ash 5.0; optic bleaching agent 0.1-0.3; polyvinyl pyrrolidone 0.3-0.5; tetraacetylethylene diamine 1-2; 2,6-ditertbuthyl4-dimethyl-aminomethylphenole as stabilizer 0.005-0.20; flavor 0.1-0.2; reaction product of oxyethylated isononylphenole, triethanolamine and sodium hydroxide 2-3; and balance: water and sodium sulfate to 100 %. Surfactant contains linear sodium alkylbenzenesulfonate or mixture thereof with fatty acid soap, or carboxymethylated isononylphenole ethoxylate sodium salt; non-ionic surfactant contains oxyethylated alkylphenoles or polyethylene glycol esters of synthetic fatty alcohols.

EFFECT: detergent of improved quality providing additional softness of washed fabric.

4 cl, 2 tbl, 6 ex

The invention relates to catalytic bleaching of substrates, for example, subjected to washing fabrics, atmospheric oxygen or air

The invention relates to macrocyclic metal complex ligands, used as catalysts for the oxidative bleaching

FIELD: chemistry.

SUBSTANCE: invention concerns liquid detergent compositions with high stability during long-term storage. The liquid detergent composition includes fluid medium with water content up to 15 mass % and coated bleaching powder suspended in it. Dissolution time of the bleach is not less than 5 minutes; the bleach coating has at least two layers: inner layer includes one or more hydrate-forming non-organic salts as the main component, and outer layer comprises 0.2 to 5% of bleach and includes an alkali metal silicate with module of SiO2 to M2O (M is an alkali metal atom) over 2.5 as the main component. Preferable compositions include sodium percarbonate with an inner layer consisting mainly of sodium sulfate and an outer layer consisting mainly of 0.5 to 1.5 mass % of sodium silicate (with module of 3.2 to 4.2) as a bleach.

EFFECT: improved detergent efficiency and stability of the claimed composition.

14 cl, 3 tbl, 12 ex

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