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Method for preparing glycine by using environment-friendly novel catalyst

A technology of glycine and catalyst, applied in the field of clean production technology of glycine, can solve the problems of insufficient catalytic capacity, many impurities in by-products, difficult treatment of waste water, etc., and achieves the effects of reducing the generation of by-products, improving catalytic efficiency, and reducing cost consumption.

Inactive Publication Date: 2020-05-01
北京长邦科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of insufficient catalytic ability, easy decomposition, many by-product impurities and difficult wastewater treatment of the old process urotropine catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Add 1300 kg of water, 12 kg of catalyst 4-dimethylaminopyridine, and 1115 kg of solid ammonium chloroacetate into a 2,000-liter enamel reaction kettle equipped with stirring and circulating water to cool down, heat the aqueous solution to 40°C, and start passing ammonia For the reaction, the temperature is controlled between 55°C and 65°C. When the pH value of the solution reaches 7.0, the ammonia flow is stopped, and the reaction is kept for 30 minutes. The reaction solution was cooled to 25°C for crystallization, and 451.9 kg of glycine ammonium chloride mixed crystal solid was separated by centrifugation. The centrifugate is the circulating reaction mother liquor.

Embodiment 2

[0053] The circulating reaction mother liquor obtained in Example 1 was continued to be put into the enamel reaction kettle, and 1115 kg of solid ammonium chloroacetate was added, and the aqueous solution was heated to 40°C, and the ammonia reaction was started, and the temperature was controlled between 55°C-65°C. When the pH value of the solution reached 7.0, the ammonia flow was stopped, and the reaction was incubated for 30 minutes. The reaction solution was cooled to 25°C for crystallization, and 1218.6 kg of glycine ammonium chloride mixed crystal solid was separated by centrifugation.

Embodiment 3

[0055] In a 2000-liter enamel reactor equipped with stirring and circulating water cooling, add 1300 kg of water, 12 kg of catalyst 4-dimethylaminopyridine, and add 950 kg of solid chloroacetic acid in ten batches. For ammonia reaction, control the reaction temperature between 30°C and 40°C. When the pH value of the solution reaches 6, no longer pass circulating water to cool down, and the ammonia reaction will heat up. The temperature is controlled between 55°C and 65°C. When the pH value reaches 7.0, stop passing ammonia, and keep warm for 30 minutes. The reaction solution was cooled to 25°C for crystallization, and 447.6 kg of glycine ammonium chloride mixed crystal solid was separated by centrifugation. The centrifugate is the circulating reaction mother liquor.

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Abstract

The invention discloses a method for preparing glycine by using an environment-friendly novel catalyst in a water phase. The novel catalyst is mainly a pyridine base compound, and comprises 4-dimethylaminopyridine (DMAP), 2,4-dimethylpyridine, 3,5-dimethylpyridine, 4-methylpyridine, 2-methylpyridine, 3-methylpyridine, 2,3-dimethylpyridine, 2-methyl-5-ethylpyridine, 3-ethylpyridine and 2-methylaminopyridine. Solid ammonium chloroacetate and chloroacetic acid are used as raw materials, and mixed crystal solids of glycine and ammonium chloride are obtained through an ammoniation reaction in a water solution. The water solution containing the catalyst can be circularly used. A glycine product and a byproduct (ammonium chloride) are prepared from the mixed crystal of glycine and ammonium chloride by adopting an electrodialysis membrane separation or alcohol precipitation separation method.

Description

technical field [0001] The invention relates to a clean production process of glycine, which uses a novel catalyst to produce glycine, and belongs to the technical field of chemical production. Background technique [0002] Glycine is an important raw material for products such as glyphosate and glycine ethyl ester hydrochloride, and it can also be refined into food-grade glycine for use. The traditional domestic water-phase chloroacetic acid aminolysis method for glycine production process is as follows: In a reaction kettle with cooling water, add an aqueous solution with a catalyst hexamethamine content of about 25%, and at the same time add a chloroacetic acid aqueous solution with a content of about 80%. For liquid ammonia, the ammonolysis reaction is carried out at a pH value of about 7 and a reaction temperature of about 80°C. The ammonolysis reaction liquid containing glycine and ammonium chloride obtained after the reaction is separated by methanol alcohol analysis...

Claims

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Application Information

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IPC IPC(8): C07C227/08C07C229/08C01C1/16
CPCC07C227/08C01C1/164C07C51/412C07C229/08C07C53/16
Inventor 刘长飞李志伟王云鹤
Owner 北京长邦科技有限公司
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