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A new method for the preparation of aminoacetic acid in an environment-friendly environment

A technology of aminoacetic acid and chloroacetic acid, which is applied in the preparation of cyanide reaction, chemical instruments and methods, and the preparation of organic compounds, can solve problems such as retention and inability to realize industrial production, and achieve energy saving, significant economic benefits and social benefits. The effect of high efficiency and product yield

Active Publication Date: 2019-02-22
仇荣庆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are new technologies for the production of aminoacetic acid reported in the literature, most of which remain in the stage of small laboratory tests and cannot be industrialized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] A new method for preparing aminoacetic acid in an environment-friendly environment, comprising the following steps:

[0017] 1) Put the same amount of water and chloroacetic acid into the reaction kettle (1-5 tons), stir and dissolve, then pass ammonia gas, and control the temperature within 60°C; when the pH value reaches about 6, stop the ammonia flow, and cool to room temperature After centrifugation, solid ammonium chloroacetate was obtained for use in the next step. The centrifuged mother liquor continues to be put into the same amount of chloroacetic acid, and then passed through the ammonia gas to reach the end point, then cool down and centrifuge, so as to circulate and use repeatedly.

[0018] Chloroacetic acid can be prepared by reacting chlorine gas with acetic acid, or purchased for use.

[0019] 2) Put ammonium chloroacetate into 5% urotropine aqueous solution, and feed ammonia gas when the temperature rises to 40-60°C, control the temperature between 60-7...

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PUM

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Abstract

The invention discloses a novel method for preparing glycine in a green and environment-friendly manner. The novel method has the advantages that the glycine prepared by the aid of the novel method is stable in quality, and various indexes of the glycine are higher than existing industrial grade standards; the glycine is high in yield, and the yield is increased to reach 95% at least from the original 80-85%; the novel method includes membrane separation technologies, methanol precipitation is omitted, accordingly, a large quantity of energy consumption can be saved, the glycine can be safely produced, wastewater can be completely eradicated, and the novel method is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a novel method for preparing aminoacetic acid which is green and environment-friendly. The method is green and environment-friendly and can realize large-scale industrial production. Background technique [0002] Domestic manufacturers currently producing aminoacetic acid (also known as glycine) all use traditional acetic acid chlorination, then ammonification, and finally alcohol analysis with methanol to obtain industrial-grade aminoacetic acid, with a content of ≥98.5% and a chloride ion of ≤0.4%. Because the chemical reaction adopts the method of cooking in one pot, and the separation adopts a large dose of methanol alcohol analysis, the yield is only 80-85%. However, distilling methanol consumes a large amount of energy. In addition, excessive ammonia and catalyst urotropine cannot be recycled during the ammonification reaction, resulting in the generation of a large amount of waste water and waste gas. It does not confor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/08C07C227/40C07C227/42C07C229/08
CPCC07C227/08C07C227/40C07C227/42C07C229/08
Inventor 仇荣庆
Owner 仇荣庆