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Novel glycine synthesis process

A technology of glycine and new process, applied in the field of new process of glycine synthesis, can solve the problems of low quality of ammonium chloride, large energy consumption by-products, increase production cost, etc., and achieve the reduction of dosage, energy consumption and energy consumption. Effect

Inactive Publication Date: 2019-04-05
SICHUAN LESHAN FUHUA TONGDA AGRO-CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problems in the prior art that the solvent uses alcohol-water mixture to increase production costs, mother liquor distillation requires a lot of energy consumption, and the quality of the by-product ammonium chloride is not high.

Method used

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Embodiment 1

[0030] A new process for synthesizing glycine, comprising the following process steps:

[0031] A, prepare the chloroacetic acid solution in the reactor, and add urotropine, slowly feed ammonia into the reactor for reaction, when the pH of the solution is 8, the ammonia is finished;

[0032] B. After the reaction is completed, the solution is transferred to the first crystallization kettle for the first cooling crystallization, and then the mixed crystallization of glycine and ammonium ammonia is obtained by centrifugation, and the remaining mother liquor is used for subsequent use;

[0033] C. Put the mixed crystals into the second crystallization tank and add water to dissolve them, then carry out the second cooling crystallization, and obtain the initial product by centrifugal separation, wash the initial product with low-temperature water, perform centrifugal dehydration after washing, and finally dry to obtain Glycine products;

[0034] D. The mother liquor is separated ...

Embodiment 2

[0036] On the basis of embodiment 1, preferred:

[0037] In step A, the concentration of the chloroacetic acid is 80%.

[0038] In step A, the quality of urotropine after the addition of urotropine is 20% of the quality of chloroacetic acid.

[0039] In step A, the controlled rate of adding ammonia gas keeps the temperature in the reactor at 65°C.

[0040] In step B, the crystallization temperature at lower temperature is 6°C.

[0041] In step C, the crystallization temperature at lower temperature is 6°C.

[0042] In step C, the temperature of the low temperature water is 5°C.

[0043] In step C, the washing is performed until the chloride ion concentration is less than 0.5%.

[0044] In step C, the drying temperature is 120°C.

Embodiment 3

[0046] On the basis of embodiment 1, preferred:

[0047] In step A, the concentration of the chloroacetic acid is 80%.

[0048] In step A, the quality of urotropine after the addition of urotropine is 28% of the quality of chloroacetic acid.

[0049] In step A, the controlled rate of adding ammonia gas keeps the temperature in the reactor at 95°C.

[0050] In step B, the temperature of the cooling crystallization is 25°C.

[0051] In step C, the temperature of the cooling crystallization is 25°C.

[0052] In step C, the temperature of the low temperature water is 10°C.

[0053] In step C, the washing is performed until the chloride ion concentration is less than 0.5%.

[0054] In step C, the drying temperature is 155°C.

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Abstract

The invention discloses a novel glycine synthesis process, and belongs to the technical field of glycine production. Chloroacetic acid and ammonia gas serve as raw materials, aminolysis reaction is performed in water solution of methenamine serving as a catalyst, first cooling crystallization is performed after reaction to obtain mixed crystals and mother solution, the mixed crystals are dissolvedby water and then subjected to second cooling crystallization, obtained initial products are washed by low-temperature water and then centrifugally separated and dried to obtain a glycine product, the mother solution is separated by electrodialysis to obtain glycine and methenamine mixed solution and ammonium chloride water solution; conveying the glycine and methenamine mixed solution to a preceding procedure for mechanical application; evaporating, concentrating and crystallizing the ammonium chloride water solution to obtain ammonium chloride. The novel glycine synthesis process solves theproblems that production cost is increased by alcohol-water mixture, mother solution distillation needs a large quantity of energy consumption, and by-product ammonium chloride product is low in theprior art.

Description

technical field [0001] The invention belongs to the technical field of glycine production, and in particular relates to a new technique for synthesizing glycine. Background technique [0002] Glycine, also known as aminoacetic acid, is an important fine chemical product, widely used in medicine, food, chemical industry, pesticide and other industries. In medicine, it is mainly used in amino acid preparations, aureomycin buffer, and ethyl imidazolate intermediate. In the food industry, it is used as a food additive for seasoning, sterilization and antisepsis, anti-oxidation, nutritional enhancement, etc. In the pesticide industry, it is mainly used as a raw material for the synthesis of glyphosate and glyphosate. Glycine is synthesized, and most foreign countries currently adopt the Strecker method using sodium cyanide (or cyanide-containing wastewater) as the main raw material. The process conditions of this method are harsh and the yield is not high, but the wastewater pro...

Claims

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Application Information

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IPC IPC(8): C07C229/08C07C227/08C07C227/42C01C1/16
CPCC01C1/164C07C227/08C07C227/42C07C229/08
Inventor 沈美忠
Owner SICHUAN LESHAN FUHUA TONGDA AGRO-CHEM TECH CO LTD
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