Method for treating mother liquid discharged in glycine production

A treatment method, the technology of aminoacetic acid, applied in the preparation/separation of ammonia, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problems of low environmental and economic benefits, unrecoverable catalyst urotropine, difficult Survival and other issues, to achieve the effect of high price, large amount, and zero emission

Inactive Publication Date: 2014-12-10
沈美忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst urotropine in the reaction cannot be recovered, and the environmental and economic benefits are very low, making it difficult for the industry to survive

Method used

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  • Method for treating mother liquid discharged in glycine production

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Effect test

specific Embodiment 1

[0020] (1) Put the mother liquor in a rectification tower, distill under reduced pressure, the pressure is -0.09Mpa, the temperature is 60°C, and the methanol and the ammonium chloride aqueous solution are separated; the methanol solution containing 8% ammonia is obtained at the top of the tower, and the methanol solution containing 8% ammonia is obtained at the bottom of the tower. Aqueous solution of ammonium chloride, urotropine, glycine;

[0021] (2) The ammonia-containing methanol separated from the top of the rectification tower in step (1) is stripped of ammonia gas, and the process is as follows:

[0022] The ammonia-containing methanol condensed from the top of the rectification tower continuously flows into the ammonium solution, and the sodium hydroxide solution is continuously added dropwise to adjust the pH value of the methanol solution to 11.8~12, so that the ammonia gas is separated from the methanol, and at the same time, air is introduced The ammonia gas is b...

specific Embodiment 2

[0026] (1) Put the mother liquor in a rectification tower, distill under reduced pressure, the pressure is -0.09Mpa, the temperature is 70°C, and the methanol and ammonium chloride aqueous solution are separated; the top of the tower obtains a methanol solution containing 12% ammonia, and the bottom of the tower contains Aqueous solution of ammonium chloride, urotropine, glycine;

[0027] (2) The ammonia-containing methanol separated from the top of the rectification tower in step (1) is stripped of ammonia gas, and the process is as follows:

[0028] The ammonia-containing methanol condensed from the top of the rectification tower continuously flows into the ammonium solution, and the sodium hydroxide solution is continuously added dropwise to adjust the pH value of the methanol solution to 11.8~12, so that the ammonia gas is separated from the methanol, and at the same time, air is introduced The ammonia gas is brought out with a resolution rate of more than 98%, and the amm...

specific Embodiment 3

[0032] (1) Put the mother liquor in a rectification tower, distill under reduced pressure, the pressure is -0.09Mpa, the temperature is 80°C, and the methanol and ammonium chloride aqueous solution are separated; the top of the tower obtains a methanol solution containing 10% ammonia, and the bottom of the tower contains Aqueous solution of ammonium chloride, urotropine, glycine;

[0033] (2) The ammonia-containing methanol separated from the top of the rectification tower in step (1) is stripped of ammonia gas, and the process is as follows:

[0034] The ammonia-containing methanol condensed from the top of the rectification tower continuously flows into the ammonium solution, and the sodium hydroxide solution is continuously added dropwise to adjust the pH value of the methanol solution to 11.8~12, so that the ammonia gas is separated from the methanol, and at the same time, air is introduced The ammonia gas is brought out with a resolution rate of more than 98%, and the amm...

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Abstract

The invention belongs to methods for treating wastewater of chemical production, and in particular provides a method for treating a mother liquid discharged in glycine production. The method comprises the following steps: (1) performing reduced pressure distillation on the mother liquid so as to obtain an amino-containing methanol solution from a top tower layer and an aqueous solution containing ammonium chloride, urotropin and glycine from a bottom tower layer; (2) blowing off the ammonia gas of the amino-containing methanol solution, so as to obtain high-concentration ammonia water; (3) performing vacuum flashing on the solution obtained from the tower bottom, and concentrating the ammonium chloride solution at the tower bottom; and (4) continuously cooling the ammonium chloride solution, thereby separating ammonium chloride. An environment-friendly treatment method for recycling the mother liquid discharged in the glycine production process is adopted, effective recycling and repeated use of ammonia water, sodium hydroxide and urotropin are achieved, and thus the standard of zero sewage discharge is met.

Description

technical field [0001] The invention belongs to a method for treating waste water in chemical production, in particular to a method for treating mother liquor discharged from the production of aminoacetic acid. Background technique [0002] Glycine is an important chemical product used in the research fields of chemical industry, medicine, pesticide, organic synthesis and biochemistry. At present, the production of aminoacetic acid mainly adopts the ammonolysis method of chloroacetic acid, that is, under the condition of normal temperature and pressure, chloroacetic acid and liquid ammonia are used as raw materials, and the synthesis is carried out under the catalysis of urotropine, and then alcohol analysis, centrifugation, refining and drying are carried out. Glycine is produced. [0003] In the production process of aminoacetic acid, every ton of finished product will produce 400 kg of black water to pollute the environment; in the traditional process, the treatment meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D487/18C07C227/40C07C229/08C01C1/02C01C1/16
CPCC07D487/18C01C1/164C07C227/40
Inventor 沈美忠
Owner 沈美忠
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