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Method for producing glycine by electrodialysis membrane separation

A technology of electrodialysis membrane and glycine, which is applied in the field of clean production technology of glycine, can solve problems such as wastewater pollution, achieve the effects of solving wastewater pollution, improving yield and product quality, and reducing catalyst consumption

Inactive Publication Date: 2019-01-11
刘长飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a clean production process of glycine, which uses electrodialysis membrane separation technology to produce glycine, reduces catalyst consumption and saves a lot of steam consumption, and fundamentally solves the problem of wastewater pollution in the production of glycine by the traditional water phase method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In a 2000-liter enamel reaction kettle with stirring, add 1500 kg of water, 75 kg of catalyst urotropine, add 1115 kg of solid ammonium chloroacetate, heat the aqueous solution to 50 ° C, and start the ammonia reaction. The temperature is controlled at 55 Between ℃ and 65 ℃, when the pH value of the solution reaches 7.5, stop the ammonia flow, and keep the reaction for 30 minutes.

[0048] The reaction solution was cooled to 25°C for crystallization, and glycine was filtered out by centrifugation. After the glycine was washed with aqueous solution and dried, 375.3 kg of glycine product was obtained, with a glycine content of 98.7% and a chloride ion content of 0.4%. The aqueous solution for washing glycine is recycled, and when the concentration of ammonium chloride in the aqueous solution is enriched to more than 20%, glycine is recovered by electrodialysis to remove ammonium chloride.

[0049] The circulating reaction mother liquor obtained after centrifugation is sen...

Embodiment 2

[0053] In a 2,000-liter enamel reactor equipped with stirring, add 1,500 kg of water, 75 kg of catalyst urotropine, and add 951 kg of solid chloroacetic acid (99.3% chloroacetic acid content) in ten batches to start the ammonia reaction. The temperature is controlled between 30°C and 40°C, and when the pH value of the solution reaches 6, the ammonia flow is stopped. The solution is heated to 50°C, and the ammonia reaction is started. The temperature is controlled between 55°C and 65°C. When the pH value of the solution reaches 7.5, the ammonia flow is stopped, and the reaction is kept for 30 minutes.

[0054] The reaction solution was cooled to 25°C for crystallization, and glycine was filtered out by centrifugation. After the glycine was washed with aqueous solution and dried, 367.2 kg of glycine product was obtained, with a glycine content of 98.9% and a chloride ion content of 0.37%.

[0055] The circulating reaction mother liquor obtained after centrifugation is sent to el...

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Abstract

The invention provides a method for producing glycine by an electrodialysis membrane separation technology. The method reduces the consumption of a catalyst, and fundamentally solves the wastewater pollution problem of traditional aqueous phase process glycine technologies. Solid ammonium chloroacetate or solid chloroacetic acid undergoes an ammonia introduction reaction is the presence of a catalyst (urotropine or paraformaldehyde) in aqueous solution to synthesize glycine and ammonium chloride, and cooling crystallization and filtration are carried out to separate glycine and obtain a cyclereaction mother liquor; and ammonium chloride in the cycle reaction mother liquor is separated by an electrodialysis device, and the solid ammonium chloroacetate or chloroacetic acid is added and undergoes a cycle reaction to obtain glycine and a byproduct ammonium chloride.

Description

technical field [0001] The invention relates to a clean production process of glycine, which uses electrodialysis membrane separation technology 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. After the reaction, the obtained ammonolysis reaction solution containing glycine and ammonium chloride is separ...

Claims

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Application Information

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IPC IPC(8): C07C227/08C07C227/40C07C229/08
CPCC07C227/08C07C227/40C07C229/08Y02P20/584
Inventor 刘长飞李志伟王云鹤
Owner 刘长飞
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