Process for preparing sodium percarbonate

A technology of sodium percarbonate and hydrated sodium carbonate, which is applied in the preparation of carboxylic acid amides, chemical instruments and methods, and the preparation of organic compounds, etc. It can solve the problems of poor wet stability of crystallized products, pollution of waste liquid discharge water, and insufficient reaction. , to achieve the effects of environmental protection, heat load reduction and consumption reduction

Inactive Publication Date: 2003-12-31
ZHEJIANG JINKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the above-mentioned preparation method, the synthesis reaction is fast, so that the reaction is not sufficient, and the crystalline product obtained by the reaction has poor wet stability.
At the same time, the consumption of sodium carbonate in the reaction is also high, and the discharge of waste liquid has certain water pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 840 grams of mother liquor and import it into the pulping kettle, start the shear emulsification machine, add 280 grams of light anhydrous sodium carbonate, 80 grams of sodium chloride and 3 grams of sodium silicate; shear and emulsify for 20 minutes, and generate sodium carbonate monohydrate suspension Liquid, suspension temperature is controlled at 38~43 ℃; Contain 840 grams of 6.0% sodium carbonate mother liquor in this reaction solution, 280 grams of sodium carbonate, 80 grams of sodium chloride and 3 grams of sodium silicate. 440 g concentration of 27.5% aqueous hydrogen peroxide is introduced into the hydrogen peroxide tank, and 4 g of aminotrimethylene phosphonic acid (ATMP), 1 g of disodium edetate, and 2 g of magnesium sulfate are added, and stirred evenly. Get mother liquor 250 grams again simultaneously, add average particle size and be 3 grams of sodium percarbonate of 100 μ m as crystal seed.

[0028] Then, import the hydrated sodium carbonate suspensi...

Embodiment 2

[0030] Method step is identical with embodiment 1, and different processing conditions are as follows: first step reaction, 840 grams of mother liquors of sodium carbonate content 5%, add anhydrous sodium carbonate 280 grams, sodium chloride 80 grams, reaction time 25 minutes, temperature of reaction 25 ~30 ℃, generate sodium carbonate decahydrate suspension; The second step reaction, concentration is 450 grams of aqueous hydrogen peroxide solution of 27.5%, 1 gram of seed crystals, aqueous hydrogen peroxide feed rate 430ml / h, sodium carbonate hydrate suspension feed intake Speed ​​800ml / h, feed reaction time 60 minutes, reaction temperature 22~23 ℃, obtained 410 grams of sodium percarbonate finished products.

Embodiment 3

[0032] The method steps are the same as in Example 1, and the different process conditions are as follows: the first step reaction, containing 840 grams of sodium carbonate 7% mother liquor, adding 280 grams of anhydrous sodium carbonate, 60 grams of sodium chloride, hydration reaction time 25 minutes, hydration reaction temperature 25~30 ℃, generate sodium carbonate decahydrate suspension; The second step reaction, concentration is 330 grams of aqueous hydrogen peroxide solution of 35%, 5 grams of seed crystals, the feeding speed of sodium carbonate hydrate suspension is 960ml / h, aqueous hydrogen peroxide solution The feeding rate is 400ml / h, the feeding crystallization reaction time is 50 minutes, and the reaction temperature is 22-23° C. to obtain 395 grams of sodium percarbonate finished product.

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Abstract

The present invention belongs to the field of oxygen-containing bleaching agent preparing technology. Sodium carbonate solution is emulsified and hydrated to prepare hydrated sodium carbonate suspension, and hydrated sodium carbonate suspension is reacted with 25-70 % concentration hydrogen peroxide solution to obtain crystal while adding sodium chloride or sodium sulfate as sallification agent,sodium silicate, organic phosphonic acid, EDTA or its sodium salt as crystallization assistant. The said preparation process has fast reaction rate and lowered sodium carbonate content in mother liquid, high sodium percarbonate yield and low material consumption, and the sodium percarbonate product has high active oxygen content, large grain size, high humid and heat stability.

Description

technical field [0001] The invention relates to a preparation method of sodium percarbonate and belongs to the technical field of preparation of oxygen-containing bleaching agents. Background technique [0002] Sodium percarbonate, also known as sodium peroxycarbonate, is the molecular formula Na 2 CO 3 1.5H 2 o 2 Sodium carbonate peroxyhydrate, the commonly used name PCS of sodium percarbonate in industry. The most widespread use of PCS is as a bleaching agent in detergent compositions, especially as a bleaching agent in concentrate and super concentrate compositions. Sodium percarbonate is usually prepared by reacting hydrogen peroxide and sodium carbonate aqueous solution, commonly known as wet crystallization processing method. Wet reaction comprises generation sodium carbonate aqueous solution, makes it react with hydrogen peroxide aqueous solution, reaction condition comprises the selection of sodium carbonate and hydrogen peroxide concentrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/10C07C231/02C07C233/36
CPCC07C233/36C01B15/103C07C231/02
Inventor 朱志刚章金龙
Owner ZHEJIANG JINKE CHEM
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