Method for preparing particle type coating sodium percarbonate

A sodium percarbonate and granular technology, applied in chemical instruments and methods, peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, inorganic chemistry, etc., can solve the difficulty of obtaining and production cost High, cumbersome process and other problems, to achieve good storage stability, reduce production costs, and easy operation

Active Publication Date: 2008-09-24
浙江金科日化新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Sodium percarbonate is unstable in a humid environment, and it is easy to decompose and release active oxygen. In order to improve the storage time of the product and expand the use of the product, it is necessary to prepare a percarbonate with good stability, active oxygen content and solubility and other indicators that meet user requirements. For sodium carbonate products, researchers from various countries have carried out a lot of research and exploration from various aspects such as synthesis process, reaction conditions, and stabilizer selection, and have achieved certain results. But so far, how to further improve the stability of sodium percarbonate still remains It is the biggest problem faced by scientific and technological personnel at home and abroad
[0007] ZL93115283.6 (notification number CN1031254C) discloses a kind of method of stabilizing sodium percarbonate, what this method obtains is powdery sodium percarbonate, and stability is relatively poor, and the reaction time in the method is too long, and hydrogen peroxide concentration is low, industrial The application value is not high
[0008] CN1435449A di

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare mother liquor (800kg): hydrogen peroxide 4kg, sodium carbonate 80kg, sodium chloride 160kg, water 556kg, stir until all dissolve.

[0033] Add 300kg of industrial sodium carbonate, 6kg of sodium metasilicate, 4kg of sodium pyrophosphate, 2kg of EDTA, and 70kg of sodium chloride into the prepared mother liquor to form a sodium carbonate slurry, and keep the temperature at 30-60°C.

[0034] Configuration concentration is 380kg of hydrogen peroxide solution of 35% (mass fraction), adds the mixed stabilizer (mass ratio 1:1:1) of 12kg ethylenediaminetetramethylene phosphonic acid, hydroxyethylidene diphosphoric acid and EDTA, 1kg sodium polyacrylate and 1kg polyacrylamide.

[0035] Add 100kg of mother liquor and 5kg of sodium percarbonate crystal nuclei with a particle size of 0.05mm to 0.1mm into the reaction kettle with a cooling jacket, and start the stirring motor. Control the flow ratio of sodium carbonate slurry and hydrogen peroxide mixed solution to be 3:1 (...

Embodiment 2

[0042] Industrial sodium carbonate 300kg and 3kg sodium metasilicate, 4kg sodium pyrophosphate, 2kg EDTA, 3kg magnesium sulfate, 3kg sodium citrate and 60kg sodium chloride are joined in the reuse mother liquor of specific embodiment 1 to form sodium carbonate slurry, The temperature is maintained at 30-60°C.

[0043] Configuration concentration is 350kg of hydrogen peroxide solution of 35% (mass fraction), adds the mixing stabilizer (mass ratio 1: 4: 1) of 23kg ethylenediaminetetramethylene phosphonic acid, hydroxyethylidene diphosphoric acid and EDTA, 10kg sodium polyacrylate .

[0044] Add 100kg of mother liquor and 5kg of sodium percarbonate crystal nuclei with a particle size of 0.05mm to 0.1mm into the reaction kettle with a cooling jacket, and start the stirring motor. Control the flow ratio of sodium carbonate slurry and hydrogen peroxide to be 3:1 (mass ratio), and input sodium carbonate slurry and hydrogen peroxide into the reactor.

[0045] The stirring speed of t...

Embodiment 3

[0051] 300kg of industrial sodium carbonate, 3kg of sodium metasilicate, 4kg of sodium pyrophosphate, 3kg of sodium citrate and 80kg of sodium chloride were added to the recycled mother liquor in Example 2 to form a slurry, and the temperature was kept at 30-60°C.

[0052] Configuration concentration is 350kg of hydrogen peroxide solution 35% (mass fraction), adds the mixing stabilizer (mass ratio 1: 2) of 15kg ethylenediamine tetramethylene phosphonic acid and EDTA, the mixture of 5kg polyacrylamide and sodium polyacrylate (mass ratio 1:0.5).

[0053] Add 100kg of mother liquor and 5kg of sodium percarbonate crystal nuclei with a particle size of 0.05mm to 0.1mm into the reaction kettle with a cooling jacket, and start the stirring motor. Control the flow ratio of sodium carbonate slurry and hydrogen peroxide to be 3:1 (mass ratio), and input sodium carbonate slurry and hydrogen peroxide into the reactor.

[0054] Control the stirring speed of the reactor to 150 rpm, the rea...

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Abstract

The invention discloses a preparation method of granular film coated sodium percarbonate, which solves the problem of the quite low stability of the prior products. In the invention, hydrogen peroxide and sodium carbonate are used as raw materials, an appropriate stabilizer and process parameters are selected to synthesize the granular type film coated sodium percarbonate product, and the raw materials are treated by the steps of dissolution, reaction, centrifugation, fluid bed spray liquid pocket, drying, etc. to prepare the high-stability granular type film coated sodium percarbonate; the bulk density of the granular type film coated sodium percarbonate prepared by the method of the invention is 750 to 1150kg/m3, the grain size is 0.8 to 1.4mm, the content of reactive oxygen species is 13.1 percent to 13.6 percent; the moisture stability is higher than 70 percent and the thermal stability is higher than 90 percent; the product is widely applicable in daily chemical, organic synthesis and other industrial fields.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a preparation method and wet coating technology of high-stability granular film-coated sodium percarbonate. Background technique [0002] Sodium percarbonate, also known as sodium percarbonate, has the general chemical formula 2Na 2 CO 3 ·3H 2 o 2 , the relative molecular mass is 314.0, and the theoretical active oxygen content is 15.28%. Coated sodium percarbonate (coated sodium percarbonate) is based on granular sodium percarbonate, and a layer of stabilizer is wrapped on the outside to improve product stability. [0003] In addition to being used as a strong oxidant, sodium percarbonate is also widely used in washing, textile, medical treatment, papermaking, electroplating, etc. Because of its high active oxygen content, sodium percarbonate is often used as a bleaching agent, bactericide, disinfectant and food preservation agent etc. Utilizing the characteristic tha...

Claims

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Application Information

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IPC IPC(8): C09C1/00C09C3/06C01B15/10
Inventor 陈惜明章伟新胡根良
Owner 浙江金科日化新材料股份有限公司
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