Method for decoloration when crude sodium pyrophosphate is purified to produce sodium pyrophosphate product

A technology for sodium pyrophosphate and crude products, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of filtration difficulties, redness and redness of sodium pyrophosphate products, and achieve the solution of filtration difficulties and improve product quality. Effect

Active Publication Date: 2017-06-23
ZHENJIANG JIANGNAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a method for decolorizing when the crude product sodium pyrophosphate is purified to produce sodium pyrophosphate products in response to the above problems, which solves the redness of sodium pyrophosphate products, or the problem of redness during product storage and use; reduces impurity phosphoric acid (pyrophosphoric acid) Salt is brought into the sodium pyrophosphate product, which affects the crystal form, improves product quality, and solves the production problem of difficult filtration

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] A method for decolorizing crude product sodium pyrophosphate purification when producing sodium pyrophosphate product, its steps are as follows:

[0019] (1) Mix the crude sodium pyrophosphate, fresh water and the applied sodium pyrophosphate mother liquor at a weight ratio of 1:1.02:4.5, and stir at 90°C for 2 hours to fully dissolve the crude sodium pyrophosphate;

[0020] (2) After the crude sodium pyrophosphate is fully dissolved, add sodium chlorate, and after stirring for 30-60 minutes, continue to drop hydrogen peroxide as an oxidant to carry out the oxidation reaction. 2.8% of;

[0021] (3) continue to drip sodium hydroxide solution, after the pH value of sodium pyrophosphate mother liquor is adjusted to 11, make Fe 3+ Precipitate formation, adsorption of oily organics and Fe using activated carbon 3+ The formed colloidal precipitate was removed by filtration;

[0022] (4) Use hydrochloric acid or phosphoric acid to adjust the pH value of the filtered solutio...

Embodiment 2

[0025] A method for decolorizing crude product sodium pyrophosphate purification when producing sodium pyrophosphate product, its steps are as follows:

[0026] (1) Mix the crude sodium pyrophosphate, fresh water and the applied sodium pyrophosphate mother liquor according to the weight ratio of 1:1.3:5, and stir at a temperature of 85°C for 2.5 hours to fully dissolve the crude sodium pyrophosphate;

[0027] (2) After the crude product sodium pyrophosphate is fully dissolved, chlorine dioxide is added as an oxygenant to carry out oxidation reaction, and the addition of chlorine dioxide is 1.5% of the crude product quality of sodium pyrophosphate;

[0028] (3) continue dripping sodium hydroxide solution, after the pH value of sodium pyrophosphate mother liquor is adjusted to 12, make Fe 3+ Precipitate formation, adsorption of oily organics and Fe using activated carbon 3+ The formed colloidal precipitate was removed by filtration;

[0029] (4) Use hydrochloric acid or phosph...

Embodiment 3

[0032] A method for decolorizing crude product sodium pyrophosphate purification when producing sodium pyrophosphate product, its steps are as follows:

[0033] (1) Mix the crude sodium pyrophosphate, fresh water and the applied sodium pyrophosphate mother liquor at a ratio of 1:0.8:3 by weight, and stir at a temperature of 95°C for 1.8 hours to fully dissolve the crude sodium pyrophosphate;

[0034] (2) After the crude product sodium pyrophosphate is fully dissolved, ozone is added as an oxidizing agent to carry out an oxidation reaction. The oxidation temperature is 70° C., the oxidation time is 1.5 h, and the addition of ozone is 4.2% of the crude product quality of sodium pyrophosphate;

[0035] (3) continue dripping sodium hydroxide solution, after the pH value of sodium pyrophosphate mother liquor is adjusted to 12, make Fe 3+ Precipitate formation, adsorption of oily organics and Fe using activated carbon 3+ The formed colloidal precipitate was removed by filtration; ...

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Abstract

The invention relates to a Method for decoloration when crude sodium pyrophosphate is purified to produce a sodium pyrophosphate product. In the process of purifying the crude sodium pyrophosphate to produce the sodium pyrophosphate product, oxidizing agent is adopted for processing, other micro-soluble aluminum phosphate (pyrophosphate), ferrous phosphate (pyrophosphate), calcium phosphate (pyrophosphate) and the like are prevented from separating out to influence product quality, the problem that the sodium pyrophosphate product is reddish or becomes reddish in storage and application is solved; the introduction of phosphate (pyrophosphate) impurities into the sodium pyrophosphate product to influence crystallization morphology is reduced; product quality is improved; and the difficulty of filtration in production is overcome.

Description

technical field [0001] The invention relates to the technical field of sodium pyrophosphate preparation, in particular to a method for decolorizing crude sodium pyrophosphate during purification and production of sodium pyrophosphate products. Background technique [0002] Sodium pyrophosphate is an important species of condensed phosphate. Whether it is industrial grade or food grade, its consumption is second only to sodium tripolyphosphate. In industry, it is mainly used as complexing agent, degreasing agent, water treatment agent, washing, printing and dyeing bleaching agent, dispersant, etc. In the food industry, it is used for food water retention and freshness preservation, anti-oxidation, etc., collectively referred to as quality improvers. With the rapid development of my country's industrial-grade and food-grade sodium pyrophosphate market, the application, research and development and improvement of related core production technologies will surely become the att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/42
CPCC01B25/425
Inventor 詹波朱建民姜胜宝张立新刘冰郑新王垚魏利
Owner ZHENJIANG JIANGNAN CHEM
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