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Method for treating mother liquor discharged from amino acetic acid production

A treatment method, aminoacetic acid technology, applied in chemical instruments and methods, heating water/sewage treatment, preparation of organic compounds, etc., can solve the problems of high ammonium chloride content, easy to block pipelines, and affect the quality of methanol, etc. The effect of improving the efficiency and solving the blockage

Active Publication Date: 2006-09-27
石家庄东华金龙化工有限公司
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

Its mother liquor contains methanol, water, ammonium chloride, free ammonia and other impurities. Ammonium chloride entrained by ammonia rises to the top of the rectification tower. After condensation, ammonium chloride crystals are easy to block the pipeline and affect work efficiency; methanol contains chlorine A lot of ammonium chloride affects the quality of methanol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0007] Add appropriate amount of hydrochloric acid in the mother liquor to adjust the pH value to 6, so that the mother liquor is neutral. The mother liquor is pumped into the feed flow meter through the transfer pump, and a small amount of feed is carried out through the feed preheater. The temperature of the preheater is 50°C-55°C, and the condenser is turned on for water supply. When the temperature at the top of the tower reaches 66°C-70°C , and remained unchanged for about 10 minutes. When the concentration was 91-94% by sampling test, a small amount of methanol began to distill out, then condensed, and methanol was recovered. ammonium chloride. The ammonium chloride impurity content in the methanol is 0.16%, which is much lower than the 1.8% impurity content when no acid is added, and the problem of pipeline blockage is solved.

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Abstract

This invention refers to the handling method of mother liquid in chemaical production, concretely is handling method of the discharged mother liquid in aminoacetic acid production. The mother liquid is entered into feed flowmeter by mother liquid transfer pump, entering feed preheater after metering, entering fractionating tower after warm-uping to 50Deg C-55Deg C, and then passing through condensator, gas-liquor separator would get carbinol and outgrowth ammonii chloridum, the charater is lies in adding right amount hydrochloric acid in the mother liquid before entering in feed flowmeter, adjusting pH value about 6, neutralizing free ammonia in mother liquid, making the mother liquid to neutral. This invention improves carbinol qulity, prevents pipeline blocking, at the same time improves the output of aminoacetic acid greatly.

Description

technical field [0001] The invention relates to a treatment method for mother liquor in chemical production, in particular to a treatment method for mother liquor discharged from aminoacetic acid. Background technique [0002] Generally, the mother liquor discharged into the mother liquor pool from the production of aminoacetic acid is not treated and directly enters the feed flowmeter through the mother liquor delivery pump. The rectifying tower, and then through the action of the condenser and the gas-liquid separator, obtain methanol and by-product ammonium chloride. Its mother liquor contains methanol, water, ammonium chloride, free ammonia and other impurities. Ammonium chloride entrained by ammonia rises to the top of the rectification tower. After condensation, ammonium chloride crystals are easy to block the pipeline and affect work efficiency; methanol contains chlorine A lot of ammonium chloride will affect the quality of methanol. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C07C227/08C07C229/08C07C31/04C01C1/16
Inventor 阎福顺闫文忠闫振法谷英瑞孙连生闫森林
Owner 石家庄东华金龙化工有限公司