Synthesis as well as tail gas treatment technology and device of iminodiacetate

A technology of iminodiacetate and synthesis process, which is applied in the preparation of organic compounds, organic chemistry, and cyanide reaction preparation, etc., which can solve the problems of cumbersome operation, numerous recovery procedures, and low hydrogen recovery rate, and achieve process operation Simple, thorough material reaction, beneficial to the effect of reaction efficiency

Inactive Publication Date: 2011-05-11
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the many types and high content of impurities in the tail gas, the recovery process is complicated, the operation is cumbersome, and the hydrogen recovery rate is not high

Method used

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  • Synthesis as well as tail gas treatment technology and device of iminodiacetate
  • Synthesis as well as tail gas treatment technology and device of iminodiacetate
  • Synthesis as well as tail gas treatment technology and device of iminodiacetate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Diethanolamine, liquid caustic soda, and deionized water are uniformly mixed in proportion to prepare a feed solution with a mass concentration of 20%. Use a metering pump to pump the feed liquid into a multi-stage tubular reactor filled with solid catalysts at a flow rate of 150Kg / h. The feed liquid is heated by a three-stage heater before entering the reactor. The material temperature is controlled at 175°C, the temperature in the reactor is controlled between 170 and 175°C, and the pressure in the reactor is maintained at 1.80Mpa. The liquid output from the gas-liquid separator enters the DSIDA metering tank, and the DSIDA yield reaches about 98.2%. The tail gas enters the water washing device through the pipeline after the regulating valve. The mixed gas obtained by water washing with a composition of 96.0% hydrogen and 3.9% water enters a drying device for drying treatment. The desiccant is molecular sieve, and 99.9% hydrogen is obtained, and the hydrogen recovery ...

Embodiment 2

[0037] Diethanolamine, liquid caustic soda, and deionized water are uniformly mixed in proportion to prepare a feed solution with a mass concentration of 20%. Use a metering pump to pump the feed liquid into a multi-stage tubular reactor filled with solid catalysts at a flow rate of 150Kg / h. The feed liquid is heated by a three-stage heater before entering the reactor. The material temperature is controlled at 155°C, the temperature in the reactor is controlled between 150 and 160°C, and the pressure in the reactor is maintained at 1.80Mpa. The liquid output from the gas-liquid separator enters the DSIDA metering tank, and the DSIDA yield reaches about 97.0%. The tail gas enters the water washing device through the pipeline after the regulating valve. The mixed gas obtained by water washing with a composition of 95.5% hydrogen and 4.4% water enters a drying device for drying treatment. The desiccant is molecular sieve, and 99.85% hydrogen is obtained, and the hydrogen recovery...

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Abstract

The invention relates to a synthesis technology and device of iminodiacetate. The technology uses diethanol amine as a main raw material and comprises the following steps: dissolving the diethanol amine, mixing with a caustic soda solution and deionized water evenly to prepare a feed liquid the mass concentration of which is 10-30%, and transferring the feed liquid into a multistage tubular reactor loaded with a solid catalyst through a metering pump to perform catalytic dehydrogenation reaction to obtain iminodiacetate; and treating the gas generated through catalytic dehydrogenation and the tail gas separated from the discharged liquid to recycle hydrogen. The device comprises the multistage tubular reactor which is designed on the basis of a kinetic model of isothermal constant-pressure reaction, wherein the multistage tubular reactor is formed by connecting 2 to 5 tubular reactors in series; each reactor is formed by a plurality of tubes; the same amount of catalyst is evenly filled in each tube; the upper part or lower part of each reactor is provided with a gas-liquid separator which is used for separating the gas generated through the dehydrogenation reaction from the discharged liquid; and the back of the gas-liquid separator is connected with a demister which is connected with a tail gas treatment device used for purification treatment through a regulating valve. The device provided by the invention has the characteristics that the technological operation is simple, the product yield is no less than 98%, the continuous production can be realized, the work efficiency can be increased, and the like.

Description

technical field [0001] The invention relates to a process device for continuously using diethanolamine to synthesize iminodiacetate, in particular to a process and device including recovery and purification of by-product hydrogen. Background technique [0002] Iminodiacetic acid is referred to as IDA, and its molecular formula is NH(CH 2 COOH) 2 , molecular weight 133.11, white crystalline powder or white monoclinic crystal, melting point 237°C, decomposition point 247.5°C, specific gravity 1.56, solubility in 5°C water 243g / 100ml, insoluble in ethanol, ether, acetone, carbon tetrachloride, It can react with acids and bases to form salts, and can form chelates with various metal ions, and can form blue chelates with divalent copper ions. [0003] Iminodiacetic acid (IDA) is used in the production of herbicide glyphosate, new amphoteric chromium complex magenta dye, pyrazine and 2-aminopyrazine, fuel detergent, cement retarder, detergent bleach activator, cisplatin Importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/16C07C227/02C01B3/52
CPCY02P20/584
Inventor 王伟周曙光陈静杨旭佘慧玲张海良屠民海林少耕
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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