Method for removing impurities in glycine synthetic process

A technology of glycine and glycine master, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc. It can solve problems such as increased viscosity, abnormal production, difficulty in crystallization and separation of glycine, etc., and achieves improved yield and suppressed The generation of impurities and the effect of reducing the cost of decolorization

Active Publication Date: 2010-06-23
BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a period of time, the production reaction system, especially the viscosity of the mother liquor of glycine increases, and the crystallization and separation of glycine is difficult, which even leads to the failure of normal production.

Method used

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  • Method for removing impurities in glycine synthetic process
  • Method for removing impurities in glycine synthetic process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0037] Embodiment 2 glycine mother liquor direct alkaline hydrolysis treatment

[0038] Get glycine mother liquor, analyze wherein α-acid content is 22.59%, and IDA content is 5.68%, detects that its visible light transmittance is 75.65% through ultraviolet-visible spectrophotometer, and its proton nuclear magnetic resonance spectrogram is shown in accompanying drawing 1.

[0039] This glycine mother liquor 100g is added in the 250ml four-neck flask, according to the alpha-acid in the glycine mother liquor and the OH in the liquid caustic soda - The mol ratio is 1: 2 and adds 75.3g of 32% liquid caustic soda altogether, and alkalinity is 13.1%, and α-acid content is 12.86%, and IDA content is 3.24%, then heating up reflux reaction. The reflux reaction temperature is controlled at about 115° C., and the reflux time is 8 hours.

[0040] After refluxing for 8 hours, the reaction was stopped, and a black precipitate was obtained by suction filtration. The precipitate weighed 1.82...

Embodiment 3

[0043] Embodiment 3 glycine mother liquor and alkaline hydrolysis solution mixed alkali hydrolysis treatment

[0044] Get glycine mother liquor, analyze wherein α-acid content is 22.59%, and IDA content is 5.68%, (NH 4 ) 2 SO 4 was 2.6%. The alkaline hydrolysis solution was taken, and the α-acid content was analyzed to be 15.87%, and the IDA content was 2.27%.

[0045] This glycine mother liquor 100g is joined in the 250ml four-necked flask, then adds 200g alkali hydrolysis solution in the flask, and the α-acid content is 18.14% in the analysis mixed solution, and IDA content is 3.41%, (NH 4 ) 2 SO 4 0.9%, the total alkalinity is 8.72%, and then the temperature rises to reflux reaction. The reflux reaction temperature is controlled at about 115° C., and the reflux time is 6 hours. Obtain filtrate 291.8g reaction liquid after reflux, analyze wherein α-acid (in terms of glycine) content is 19.43%, IDA (in terms of iminodiacetic acid) content is 3.73%, basically can't dete...

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Abstract

The invention provides a method for removing impurities in glycine reaction liquid and mother liquid in a glycine preparing process by using a glycolonitrile method. The method comprises the following steps: carrying out independent backflow to alkaline hydrolysis synthetic liquid after alkaline hydrolysis is finished or mixing the glycine mother liquid and liquid alkaline synthetic liquid and then carrying out the alkaline hydrolysis; carrying out intermittent or continuous production under high-temperature backflow; and finally removing the impurities.

Description

technical field [0001] The invention relates to removing organic impurities such as amides and peptides and inorganic impurities such as ammonium sulfate in glycine reaction liquid and mother liquor in the process of producing glycine from hydroxynitrile compounds, precipitating colored impurities therein, and effectively recovering glycine products and glycine in glycine mother liquor. A method for the by-production of iminodiacetic acid. Its characteristic is that the alkali hydrolysis solution of glycine and the mother liquor are refluxed under relatively strong alkaline conditions, and most of the condensation products such as amides and peptides can be hydrolyzed into products such as glycine and iminodiacetic acid, etc. A large number of impurities such as polymerized coke and metal complexes are removed by filtration, and ammonium sulfate is converted into by-product sodium sulfate. In this way, by treating and optimizing the process conditions, not only can the conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/08C07C227/40
Inventor 喻宏贵崔建斌黄仁才廖翠莺孙响响杨立雯查正炯尹应武
Owner BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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