Method of disinfectant preparation and disinfectant

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

 

Scope

The invention relates to the field of applied electrochemistry, and can be used in all fields of technology, which requires the use of disinfectants, in particular in medicine, food industry and others.

Prior art

Currently in medicine and in various areas of technology, and in particular in the field of water treatment, widely used disinfectant aqueous solutions containing inorganic compounds, particularly compounds active chlorine obtained by chemical means [see, for example, Lagowski and other natural water treatment Technology, Kiev, High school, 1981, p.22-25].

A disadvantage of the known solutions is not high enough disinfecting ability in the presence of organic contaminants, highly corrosive, high safety requirements, the presence of large amounts of ballast substances in the working solution.

Such drawbacks of electrochemical methods for obtaining such solutions allows to simplify the cooking process, to reduce the number of reagents.

The closest to the technical essence and the achieved result is a method that is implemented in the device for disinfecting and cleaning solutions by electrochemical processing solutions is lorido alkali metal concentration up to 5 g/l, obtained by mixing drinking water with a saturated solution of chloride of an alkali metal. In the known method the solution of the alkali metal chloride is fed parallel flows in the anode and cathode chamber of the electrochemical reactor, and after processing is supplied to the consumer [see Electrochemical activation: history, status. Perspectives, M., Academy of medical and technical Sciences, ed. VNIIIMT, 1999, p.36-38]. The solution treated in the anode chamber, is a disinfectant, and the solution treated in the cathode chamber - cleaning. This method is selected by the authors as a prototype.

The application of the known technical solution allows to obtain solutions with a relatively high disinfecting and sterilizing ability.

A disadvantage of the known solutions are low pH values obtained from the anode chamber solution (anolyte), which accounts for its enhanced corrosion activity, and also requires increased security measures when using. The low pH of the anolyte was attributed to the presence of dissolved chlorine, which is in a free form is a toxic substance.

Currently widely debated replacing chlorine-containing disinfectants other, not containing chlorine. For example, it is known that paracaseinate, in particular peroxocarbonate sodium on lady disinfectant, bactericidal action [see (Chemical encyclopedia), Moscow, Publishing house "Great Russian encyclopedia", 1992, Vol.3, str].

However, the known method cannot be applied to obtain disinfectants chlorine, in particular to obtain solutions peroxocarbonates alkali metals.

Known technical solution relating to sanitation and which is a disinfectant. The known solution is used to disinfect medical equipment with metal parts, and contains a low-molecular percolate, stabilizer percolate and corrosion inhibitor. Percolate in a known disinfectant is not in equilibrium and that the tool itself is obtained by mixing the two solutions, the components of which take in certain proportions. One of the solutions includes a low-molecular percolate, and the other is a corrosion inhibitor and stabilizer peroxide, and/or stabilizer percolate. The proposed tool is a two-module composition, with one module contains a first aqueous solution comprising a lower aliphatic percolate, and the other module comprises a second aqueous solution containing a corrosion inhibitor and stabilizer of hydrogen peroxide, and/or stabilizer percolate [RF patent №212243, 61L 2/16, 1998]. This solution is chosen as the prototype for the inventive disinfectant. The use of known means, which translates into an active form at the place of consumption by mixing two modules, allows to eliminate the corrosion of metals in disinfected equipment.

However, the known tool contains a significant amount of substances hazardous to life and health as in Toxicological terms, and in terms of their potential to cause chemical burns. Its antimicrobial activity is reduced due to the high content of auxiliary inactive components. In addition, relatively high labor costs and the cost of providing security for the manufacture, transportation, storage, and use.

Disclosure of inventions

The technical result of the use of the present invention is to provide opportunities for disinfectants, chlorine, namely solutions of peroxocarbonates alkali metals, when used as initial solution is highly diluted aqueous solution of a carbonate or bicarbonate of an alkali metal, and ensuring that the process of obtaining such solutions at room temperature without the use of special means to control the temperature within the process p is obtaining these solutions.

The technical result is to increase the efficiency of the disinfectant, reducing the cost of its manufacture and use while maintaining the possibility of obtaining it in the required quantities at the place of consumption.

This technical result is achieved by the fact that the electrochemical method of obtaining a disinfectant, involves feeding an aqueous solution of inorganic salt in the anode chamber diaphragm electrochemical cell with a cylindrical coaxial electrodes and coaxial ceramic ultrafiltration aperture, the feed to the cathode in the same cell electrolyte and the output of the disinfectant from the anode chamber, the aqueous solution of inorganic salt used solution of carbonate of alkali metal, the electrolyte used is fresh water, and the carbonate solution and water is fed into the anode and cathode chamber of the cell counter, and the process is conducted when the transfer current through the aperture mainly ions of the alkali metal.

As an aqueous solution of carbonate of alkaline metal is used carbonate or sodium bicarbonate concentration of 0.2-2 g/l

The process is conducted at elevated pressure in the anode chamber in comparison with the cathode by 0.1-0.5 ATM.

The process is conducted while maintaining the velocity of the flow electr the lita in the cathode chamber (Catolica) 2-5 times more than the speed of flow of the electrolyte in the anode chamber (anolyte).

The process is conducted using 2-10 electrochemical cells in a sequential hydraulic connection of anode and cathode chambers of the cell.

The technical result is also achieved by the fact that the resulting disinfectant that contains paracaseinate that are in thermodynamic non-equilibrium state obtained by treating an aqueous solution of a carbonate of an alkali metal concentration of 0.2-2 g/l in the anode chamber of the electrochemical diaphragm cell with coaxial electrodes and coaxial ultrafiltration ceramic diaphragm, and the treatment is carried out until pH=6-7 and content of oxidants 20-300 mg/L.

The fact that the electrochemical method of obtaining a disinfectant is carried out by feeding an aqueous solution of a carbonate of an alkali metal in the anode chamber diaphragm electrochemical cell with a cylindrical coaxial electrodes and coaxial ceramic ultrafiltration aperture, while the supply to the cathode in the same cell fresh water, and the carbonate solution and water is fed into the anode and cathode chamber of the cell counter, and the process is conducted when the transfer current through the aperture mainly ions of an alkali metal, solves put the NUU task and get disinfectant containing peroxidase.

It is known that peroxoborate and their salts receive by anodic oxidation of the corresponding aqueous solutions of simple salts [see (Chemical encyclopedia), Moscow, Publishing house "Great Russian encyclopedia", 1992, Vol.3, str]. However, it is noted that the process is carried out using concentrated solutions of carbonates at low temperatures (down to -25°).

Such recommendations are based on the fact that when heated peroxides decompose [see Chemical dictionary, M., "Soviet encyclopedia", 1983, str].

A method of obtaining parksokolniki acid by electrolysis of a solution containing potassium thiocyanate while bubbling carbon dioxide through the solution. The pressure of carbon dioxide is maintained at the level 2-23 ATM, and the process is conducted in electrolyzer the electrolyzer when the anodic current density of 0.05-0.5 a/cm [see USSR Author's certificate No. 1815262, SS 407/00, 1993]. Although this process does not require low temperatures, however, is time consuming and requires the consumption of chemicals and energy costs in maintaining pressure and the bubbling of carbon dioxide. In addition, this process is carried out in electrolyzer the electrolyzer, which requires additional process steps for selection of the target product and prevention of loss of Rodan is and potassium.

The proposed solution allows to obtain peroxoborate anodic oxidation of dilute solutions of carbonates of alkali metals concentration of 0.2-2 g/l at room temperature, without the use of special additives in the electrolyte and without sparging of carbon dioxide, which suggests that the well-known recommendations were not used in the proposed solution.

The process by transferring power through the aperture sodium ions allows to solve the problem, to ensure the formation of paracaseinate anodic oxidation of a dilute solution. To ensure transfer of current through the aperture predominantly sodium ions is possible when submitting to the cathode of fresh water, i.e. water containing a small amount of dissolved impurities, as well as by increasing the pressure in the anode chamber, which will inhibit penetration of hydroxide ions from the cathode chamber, or adjusting the concentration of Catolica due to its more rapid flow in the chamber, or in some other way.

When submitting Catolica countercurrent, in comparison with the flow of anolyte, achieves a more complete removal of alkali metal cations from the flow of anolyte, which is impossible to obtain when applying Catolica parallel.

As an aqueous solution of carbonate of alkaline metal is used, the sodium carbonate is concentratie 0,2 - 2 g/l At lower concentrations below 0.2 g/l it is impossible to obtain solutions with the necessary oxidizing activity, while exceeding concentrations of more than 2 g/l significantly increasing the cost of electricity and time to remove metal cations from the anolyte and the oxidation of carbonate anions.

The process is conducted at elevated pressure in the anode chamber in comparison with the cathode by 0.1-0.5 ATM. The optimum pressure difference determined from the concentration of carbonate solution and parameters of electrolysis. At a pressure of less than 0.1 ATM is unable to suppress the backflow of Oh-ions from the cathode chamber, which leads to the cessation of the process of oxidation of carbonate ions. At a pressure of more than 0.5 ATM is removed through the aperture of the flow of anolyte not only of alkali metal cations, but also and carbonate ions, which reduces the current output of paracaseinate.

You can carry out the process while maintaining the velocity of the flow of the electrolyte in the cathode chamber 2 to 5 times greater than the rate of flow of the electrolyte in the anode chamber. When the velocity of the flow lower limit of the specified ratio is unable to provide the transfer of current through the aperture predominantly sodium ions, and when the speed limit is exceeded by more than 5 times significantly increases the hydraulic head gradient in the cathode chamber, which leads to n is the violation mode is the same differential pressure on the diaphragm electrochemical reactor.

The process is conducted using 2-10 electrochemical cells in a sequential hydraulic connection of anode and cathode chambers of the cell.

This allows you to increase productivity and improve the quality of the product. When using more than 10 cells increases the complexity of determining and maintaining optimal pressure difference between anode and cathode chambers in cells, as it significantly increases the hydraulic resistance of the cathode reactor chamber presented several series cameras electrochemical cells.

Obtained according to the invention sanitizer contains paracaseinate being in a metastable state, which ensures its high oxidative activity. What this tool is obtained by treating an aqueous solution of a carbonate of an alkali metal concentration of 0.2-2 g/l in the anode chamber of the electrochemical diaphragm cell with coaxial electrodes and coaxial ultrafiltration ceramic diaphragm, eliminates tool stabilizers and other ballast ingredients that are required additives in obtaining the most similar in chemical composition of active substances means chemical means and which reduce its effectiveness, the simultaneity the temporal increasing corrosion ability. In addition, obtaining by means of an electrolytic in a compact installation makes little effort to ensure his presence at any moment in any desired number directly at the place of consumption.

It is known that the solutions of carbonate of alkaline metal have high pH (9 to 11). The fact that electrochemical machining processing is carried out to achieve pH=6-7 and content of oxidants 20-300 mg/l, provides for obtaining the necessary degree of oxidative activity extensive functionality for use, as it is, having a neutral pH value, does not have high corrosion activity.

Brief description of drawings

The method is implemented using the setup scheme is shown in the drawing.

Device for producing a disinfecting solution paracaseinate - anolyte "Perox" - consists of a diaphragm flow-through electrochemical reactor 1, representing either a single orifice flow-through electrochemical modular element of the EMP, in English transcription - FEM, or block these items from 2-10 pieces. The interelectrode space of each cell are separated by a diaphragm 2 on the anode 3 and cathode 4 cameras. Camera cell is connected hydraulically in series. The installation includes ecostiletto - solution of carbonate of alkaline metal 5, which through the metering device 6 is connected with a hydraulic line 7. Line 7 is connected to the inlet of the anode chamber 3 and the outlet of the anode chamber 3 is connected to the line 8 output anolyte "Perox"which includes a pressure regulator to itself 9. The system includes a hydraulic line 10 connected to the inlet of the cathode chamber 4. The output of the cathode chamber 4 is connected to the line 11 output Catolica. To install the connected supply line water valve 12, which is equipped with a filter 13, the flow regulator 14 and the sensor duct 15. Line supply of fresh water are connected with lines 7 and 10 of the filing of the solutions in the anode 3 and cathode 4 cameras.

The device operates as follows.

On line supply of fresh water comes from the last lines 7 and 10 to the inputs of the anode 3 and cathode 4 cameras. Using the dosing device 6 a solution of carbonate of an alkali metal concentration of 0.2-2 g/l is supplied to the processing in the anode chamber 3. Using the pressure regulator 9 to set the required pressure difference across the diaphragm 2, with flow regulator ustanavlivaetsya ducts of Catolica and anolyte, while the contact sensor duct is closed and the electrodes of the reactor 1 is energized from a current source (not shown in the figure).

The differential pressure across the diaphragm is supported at the level of 0.1-0.5 ATM. On to the Tode reaction takes place recovery of water:

2H2O+2E→H2+2HE-.

As moving water in a cathode chamber of the concentration of sodium hydroxide increases as a result of electromigration of sodium ions from the anode chamber through the aperture in the cathode chamber. In the anode chamber at the initial stage duct solution of sodium carbonate are the formation of peroxocarbonates sodium in accordance with the total electrochemical reactions:

2Na2CO3+10H2About→2HOC(O)OOC(O)ONa+2NaOH+O2+8H2;

2N2CO3+6N2O→2HOC(O)OONa+2NaOH+4H2+CO2.

As further advancement carbonate solution in the anode chamber and reducing the pH of the medium is the impoverishment of its sodium ions and carbonate into bicarbonate, which also undergo oxidation by the following total responses:

2NaHCO3+2H2O→HOC(O)OOC(O)ONa+NaOH+2H2+1/2O2;

2NaHC3+H2O→HOC(O)OONa+NaOH+H2+CO2.

When further lowering the pH in the anode chamber and bring it to pH=7, the next step anodic oxidation of solutions of peroxocarbonates sodium is turning peroxocarbonate salts into their corresponding acids naugolnoe (NOSE(OH)OOS(O)OH) and mononaturalism (the NOSE(UN):

HOC(O)OOC(O)ONa+H2About→NOSE(OH)OOS(O)HE+NaOH;

HOC(O)OONa+H2About→NOSE(O)UN+NaOH.

Get the solution the anolyte "Perox" - has the following characteristics: content mononemurenai and nedovolnoj acid is from 20 to 300 mg/l oxidation-reduction potential in the range from +500 to +800 mV relative to silver chloride reference electrode, the total concentration of dissolved electrolytes from 0.2 to 2.0 g/L.

Options specific implementation

The invention is illustrated by the following examples, which, however, do not exhaust all possible options for implementing the method.

All of the examples used electrochemical reactor according to the patent of Russian Federation №2078737 with coaxially mounted cylindrical and rod electrodes and coaxial same installed between ceramic ultrafiltration aperture of ceramics on the basis of a mixture of oxides of zirconium, aluminum, and yttrium, with a thickness of 0.7 mm as electrodes were used titanium coated with iridium oxide (anode) and titanium with pyrocarbon coating (cathode). The length of the active areas of the electrodes of the reactor is equal to 200 mm, and the volume of the electrode chambers are 10 ml cathode chamber and 7 ml of the anode.

The efficiency obtained in the anode chamber disinfectant - anolyte "Perox was evaluated on the following parameters:

- hydrogen ion exponent (pH);

- oxidation-reduction potential (ORP)measured relative to CHL is serebrjanogo reference electrode, mV;

- oxidative capacity, equivalent to a content of active chlorine (COh), mg/l, determined by the method iodometric titration;

- mineralization anolyte (Cs), g/l, determined by the method of conductometry.

Example 1. To implement the method was used to install, the scheme of which is shown in the drawing. The reactor contained 8 electrochemical cell, the anode and cathode chambers were connected hydraulically in series.

Fresh water was supplied on lines 7 and 10 to the inputs of the anode 3 and cathode 4 cameras. Using the dosing device 6 a sodium carbonate solution of concentration 10 g/l from the tank 5 was entered in line 7 and mixed with the supplied fresh water. The initial sodium carbonate solution of a concentration of 0.3 g/l was fed to the processing in the anode chamber 3 at a rate of 20 liters per hour. Using the flow regulator 14 ostanavlivas speed flow Catolica 40 liters per hour. Using the pressure regulator 9 installed differential pressure on the diaphragm 2 at 0.2 ATM. To the electrodes of the reactor 1 was energised 35, in which a reactor flowed a current of 20 A. In the process on line 8 whenever a solution to the anolyte "Perox"and on line 11 of the catholyte. The content of oxidants in the anolyte "Perox" was 20-30 mg/l, fluctuations in the redox potential in the range of +500 to+600 mV, pH values from 62 to 6.7, when the salinity of the anolyte from 0.20 to 0.28 g/l

Example 2. The method was carried out under the conditions of example 1, but in the cathode chamber of the reactor was supplied the original sodium carbonate solution of concentration 2 g/l at a rate of 20 l/h With a flow rate regulator 14 ostanavlivas speed flow Catolica 40 liters per hour. Using the pressure regulator 9 installed differential pressure on the diaphragm 2 in 0.5 ATM. To the electrodes of the reactor 1 was energised 20, in which a reactor flowed a current of 50 A. In the process on line 8 whenever a solution to the anolyte "Perox"and on line 11 of the catholyte. The content of oxidants in the anolyte "Perox" was 230-250 mg/l, fluctuations in the redox potential in the range of +700 to+800 mV, pH values from 6.5 to 7.1, while mineralization of anolyte from 1.85 to 1,95 g/l

Example 3. To implement the method was used to install the reactor which contained 8 electrochemical cell, the anode and cathode chambers were connected hydraulically in series.

Fresh water was supplied on lines 7 and 10 to the inputs of the anode 3 and cathode 4 cameras. Using the dosing device 6 a sodium carbonate solution of concentration 10 g/l from the tank 5 was entered in line 7 and mixed with the supplied fresh water. The initial sodium carbonate solution of a concentration of 0.3 g/l was fed to the processing in the anode chamber 3 at a rate of 20 liters per hour. With OSU flow regulator 14 ostanavlivas speed flow Catolica 100 liters per hour. Using the pressure regulator 9 installed differential pressure on the diaphragm 2 at 0.2 ATM. To the electrodes of the reactor 1 was energised 42, in which a reactor flowed a current of 20 A. In the process on line 8 whenever a solution to the anolyte "Perox"and on line 11 of the catholyte. The content of oxidants in the anolyte "Perox" was 35-40 mg/l, fluctuations in the redox potential in the range of +580...+700 mV, pH from 6.3 to 6.8, with mineralization of anolyte from 0.22 to 0.28 g/l

Example 4. To implement the method was used to install, the scheme of which is shown in the drawing. The reactor contained 8 electrochemical cell, the anode and cathode chambers were connected hydraulically in series.

Fresh water was supplied on lines 7 and 10 to the inputs of the anode 3 and cathode 4 cameras. Using the dosing device 6 a sodium carbonate solution of concentration 10 g/l from the tank 5 was entered in line 7 and mixed with the supplied fresh water. The initial solution of sodium carbonate concentration of 2 g/l was fed to the processing in the anode chamber 3 at a rate of 20 liters per hour. Using the flow regulator 14 ostanavlivas speed flow Catolica 100 liters per hour. Using the pressure regulator 9 installed differential pressure on the diaphragm 2 in 0.5 ATM. To the electrodes of the reactor 1 was energised 26, in which a reactor was leaking current silo is 48 A. In the process on line 8 whenever a solution to the anolyte "Perox"and on line 11 of the catholyte. The content of oxidants in the anolyte "Perox" was 280-320 mg/l, fluctuations in the redox potential in the range of +750...+830 mV, pH from 6.4 to 7.0, when mineralization of anolyte from 1.5 to 1.8 g/l

Industrial applicability

As follows from the presented data, the invention allows to obtain disinfectants that do not contain active chlorine, namely solutions of peroxocarbonates alkali metals, while maintaining low power consumption for obtaining these solutions, and ensure the process of obtaining such solutions at room temperature without the use of special means of temperature control additives and auxiliary chemicals in the process of obtaining these solutions.

The invention allows to obtain an effective disinfectant - analyte "Perox - reducing the cost of its manufacture and use while maintaining the possibility of obtaining it in the required quantities at the place of consumption.

1. The electrochemical method of obtaining a disinfectant, comprising feeding an aqueous solution of inorganic salt in the anode chamber diaphragm electrochemical cell with a cylindrical coaxial electrodes and coaxial ceramic ultrafiltration aperture, n is the cottage in the cathode chamber of the same cell auxiliary electrolyte and the output of the disinfectant from the anode chamber, characterized in that an aqueous solution of inorganic salt used solution of carbonate of alkali metal, as supporting electrolyte using fresh water, and an aqueous solution of carbonate and water is fed into the anode and cathode chamber of the cell counter and the process is conducted when the transfer current through the aperture mainly ions of the alkali metal.

2. The electrochemical method of obtaining a disinfectant according to claim 1, characterized in that an aqueous solution of carbonate of alkaline metal is used, the sodium carbonate concentration of 0.2-2 g/l

3. The electrochemical method of obtaining a disinfectant according to claim 1, wherein the process is conducted at elevated pressure in the anode chamber in comparison with the cathode by 0.1-0.5 ATM.

4. The electrochemical method of obtaining a disinfectant according to claim 1, wherein the process is conducted while maintaining the velocity of the flow of the electrolyte in the cathode chamber 2 to 5 times greater than the rate of flow of the electrolyte in the anode chamber.

5. The electrochemical method of obtaining a disinfectant according to claim 1, wherein the process is conducted using 2-10 electrochemical cells in a sequential hydraulic connection of anode and cathode chambers of the cell.

6. Disinfectant containing peroxisome the care, being in a metastable state, characterized in that it is obtained by treating an aqueous solution of a carbonate of an alkali metal concentration of 0.2-2 g/l in the anode chamber of the electrochemical diaphragm cell with coaxial electrodes and coaxial ultrafiltration ceramic diaphragm, and the processing is carried out to achieve a pH of 6-7.



 

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11 cl, 1 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: 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

The invention relates to the chemical industry, in particular to household chemicals, and can be used in the manufacture of percarbonate sodium and other chemical products, where the process of synthesis is combined with granulation synthesized product

The invention relates to a method for nadali and more specifically to percarbonate sodium and thus obtained the sodium percarbonate

The invention relates to percarbonate sodium-containing detergent compositions

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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