Application of sulfurous acid as formaldehyde blocking agent and decolorizing agent

A sulfurous acid and reaction technology, which is used in the application field of sulfurous acid as a formaldehyde blocking agent and decolorizing agent, can solve the problems of large equipment investment, cumbersome operation, and long process

Inactive Publication Date: 2017-11-07
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in industrial production, it is usually necessary to add a large amount of activated carbon in the downstream or use high-cost membrane decolorization and other technologies for decolorization, which requires large equipment investment, long process and cumbersome operation.

Method used

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  • Application of sulfurous acid as formaldehyde blocking agent and decolorizing agent
  • Application of sulfurous acid as formaldehyde blocking agent and decolorizing agent
  • Application of sulfurous acid as formaldehyde blocking agent and decolorizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098]Take 1000 g of iminodiacetonitrile reaction solution produced by Xinjiang Ziguang Yongli Chemical Industry Co., Ltd., which is brown-black, with an iminodiacetonitrile content of 25%, quickly cool down to 45°C, feed sulfur dioxide gas until the reaction solution pH=3.0, and cool down to 10-15°C. ℃, stirred and crystallized for 6.0 h, filtered, washed the solid with a small amount of water, and dried to obtain 238.6 g of white iminodiacetonitrile product, the content of iminodiacetonitrile was 98.3%, and the impurity content of compound I was 0.38%.

Embodiment 2

[0104] Take 1000 g of iminodiacetonitrile reaction solution produced by Xinjiang Ziguang Yongli Chemical Industry Co., Ltd., which is brown-black, with an iminodiacetonitrile content of 25%, quickly cool down to 45°C, feed sulfur dioxide gas until the pH of the reaction solution is 2.0, and cool down to 10-15°C. ℃, stirred and crystallized for 6.0 h, filtered, washed the solid with a small amount of water, and dried to obtain a white iminodiacetonitrile product 236.8, with an iminodiacetonitrile content of 98.9% and an impurity content of 0.15% in Compound I.

Embodiment 3

[0106] Take 1000 g of iminodiacetonitrile reaction solution produced by Xinjiang Ziguang Yongli Chemical Industry Co., Ltd., which is brown-black, with an iminodiacetonitrile content of 25%, quickly cool down to 45°C, feed sulfur dioxide gas until the reaction solution pH=4.0, and cool down to 10-15°C. ℃, stirred and crystallized for 6.0 h, filtered, washed the solid with a small amount of water, and dried to obtain 233.5 g of white iminodiacetonitrile product, the content of iminodiacetonitrile was 97.9%, and the impurity content of compound I was 0.52%.

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Abstract

The invention belongs to the field of chemical industry, and in particular relates to the application of sulfurous acid as a formaldehyde blocking agent and a decolorizing agent. Sulfurous acid itself can be used as an acid regulator to acidify the system, and sulfurous acid can quickly react with the formaldehyde released during the acidification process to block the formation of impurities, that is, sulfurous acid can be used as a formaldehyde blocking agent; more unexpectedly, Sulfuric acid not only has the effect of preventing the formation of impurities, but also decolorizes the darker color produced by the polymerization or decomposition of nitrile substances. The dark reaction solution obtained from the preparation of aminoacetonitrile derivatives becomes light yellow after being treated with sulfurous acid Even colorless, the product obtained by crystallization is white or off-white. Similarly, when nitriles are hydrolyzed into carboxylic acids, sulfurous acid is added, and the cyanogen hydrolyzed carboxylic acid product obtained by crystallization is white or off-white.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to the application of sulfurous acid as a formaldehyde blocking agent and a decolorizing agent. Background technique [0002] The structural formula of aminoacetonitrile derivatives has been introduced in detail in the patents with application numbers 99105289.7 and 03801730.X. Aminoacetonitrile derivatives are mainly used in the production of medicine, rubber, metal cleaning agents, complexes, especially the herbicide glyphosate etc. [0003] According to different substituents, there are many aminoacetonitrile derivatives, the common ones are iminodiacetonitrile, anilinoacetonitrile, ethylenediaminetetraacetonitrile, aminoacetonitrile and N,N-dimethylglycylnitrile, etc., each The specific synthesis methods of these substances are also different, but the commonly used method is prepared by reacting ammonia or compounds containing amino groups with hydroxyacetonitrile, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C255/24C07C253/30C07C253/34
Inventor 丁永良郑道敏刘佳徐代行柳亚玲
Owner CHONGQING UNISPLENDOUR CHEM
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