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A kind of method preparing sodium percarbonate with sodium carbonate decahydrate

A technology of sodium carbonate decahydrate and sodium percarbonate, applied in chemical instruments and methods, peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, inorganic chemistry, etc., can solve reaction stability impact and other issues, to achieve far-reaching effects of increasing productivity and environmental protection

Active Publication Date: 2016-05-18
JIANGXI BOHOLY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain high-quality products, but due to the increase of emulsification and hydration reactions, the stability of the reaction is more or less affected

Method used

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  • A kind of method preparing sodium percarbonate with sodium carbonate decahydrate
  • A kind of method preparing sodium percarbonate with sodium carbonate decahydrate
  • A kind of method preparing sodium percarbonate with sodium carbonate decahydrate

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Embodiment 1

[0022] Proceed as follows:

[0023] 1. Preparation of sodium carbonate decahydrate slurry: 32% mother liquor and 67.7% sodium carbonate decahydrate crystals, in which 0.15-0.3% sodium metasilicate pentahydrate mixture of mother liquor is heated to 26°C-40°C and begins to dissolve, after filtration Then add a certain amount of salt, so that the salt content is 13%-19%, and then add 0.5-0.8% magnesium sulfate heptahydrate, mix evenly, and set aside.

[0024] 2. Preparation of hydrogen peroxide mixture: Add 8g of stabilizer HEDP (hydroxyethylene diphosphonic acid) and the same amount of dispersant PAAS (sodium polyacrylate) per kilogram of 35% hydrogen peroxide solution, mix well, and cool to -5°C-5 ℃, for use.

[0025] 3. Prepare the reaction bottom solution: start stirring at a speed of 40 rpm, add 1L of mother liquor to the reaction tank, and dissolve 1.5-1.7% of sodium tripolyphosphate and 1.1-1.3% of the weight of the mother liquor. Magnesium sulfate heptahydrate.

[0026]...

Embodiment 21

[0046] 1. Preparation of sodium carbonate decahydrate slurry: 32% mother liquor and 67.7% sodium carbonate decahydrate, 0.15-0.3% sodium metasilicate pentahydrate mixture is heated to 26 ° C and begins to dissolve, and the temperature is raised until it is completely dissolved. The highest temperature is less than 40°C, filter and then add a certain amount of salt to make the salt content 13-19%, then add 0.5-0.8% magnesium sulfate heptahydrate, mix well, and set aside.

[0047] 2. Preparation of hydrogen peroxide mixture: Add 8g of stabilizer HEDP (hydroxyethylene diphosphonic acid) and the same amount of dispersant PAAS (sodium polyacrylate) per kilogram of 35% hydrogen peroxide, mix well, and cool to -5°C-5°C ,stand-by.

[0048] 3. Prepare the reaction bottom liquid: start stirring, the frequency is 40 rpm, 3m 3 Add 0.1m into the reaction kettle 3 In the mother liquor, 1.5-1.7% of sodium tripolyphosphate and 1.1-1.3% of magnesium sulfate heptahydrate are dissolved to acco...

Embodiment 22

[0051] 1. Preparation of sodium carbonate decahydrate slurry: 32% mother liquor and 67.7% sodium carbonate decahydrate, 0.15-0.3% sodium metasilicate pentahydrate mixture is heated to 26 ° C and begins to dissolve, and the temperature is raised until it is completely dissolved. The highest temperature is less than 40°C, filter and then add a certain amount of salt to make the salt content 13-19%, then add 0.5-0.8% magnesium sulfate heptahydrate, mix well, and set aside.

[0052] 2. Preparation of hydrogen peroxide mixture: Add 8g of stabilizer HEDP (hydroxyethylene diphosphonic acid) and the same amount of dispersant PAAS (sodium polyacrylate) per kilogram of 35% hydrogen peroxide, mix well, and cool to -5°C-5°C ,stand-by.

[0053] 3. Start stirring, the frequency is 40 rev / min, 3m 3 Add 0.1m into the reaction kettle 3 In the mother liquor, 1.5-1.7% of sodium tripolyphosphate and 1.1-1.3% of magnesium sulfate heptahydrate are dissolved to account for the weight of the mother...

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Abstract

The invention relates to a method for preparing sodium percarbonate and a product and in particular relates to a method for preparing sodium percarbonate from sodium carbonate decahydrate and a product. The product is prepared by reacting among sodium carbonate decahydrate crystals, mother liquor, a crystallization promoting agent and a hydrogen peroxide solution. The crystallization promoting agent is added to sodium carbonate decahydrate dissolved in the mother liquor, the hydrogen peroxide solution and the reactive crystallization reaction process, thus ensuring that a full amount of the crystallization promoting agent is added at a certain temperature. Supersaturation is quickly broken by the crystallization reaction, so that the sodium percarbonate product with high active oxygen content is obtained after the crystallization reaction.

Description

technical field [0001] The invention relates to a preparation method and product of sodium percarbonate, in particular to a method and product for preparing sodium percarbonate with sodium carbonate decahydrate. Background technique [0002] Sodium percarbonate has the molecular formula Na 2 CO 3 1.5H 2 Sodium carbonate peroxyhydrate of O is used industrially as a bleaching agent in detergent compositions. Sodium percarbonate is usually prepared by reacting hydrogen peroxide and sodium carbonate aqueous solution, which is called wet crystallization processing method. During the reaction process, crystal aids and salting-out agents, such as industrial salt, etc. are usually added to ensure the stability of the product, submit the yield, and reduce the cost. Factors affecting the quality of sodium percarbonate include the selection of the crystallization aid type and the way of adding it, the concentration of hydrogen peroxide, the reaction temperature, the amount of salti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B15/10
Inventor 刘林生曾道龙骆家明
Owner JIANGXI BOHOLY CHEM