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
CN102050751AInactive Publication Date: 2011-05-11ZHEJIANG XINAN CHEM INDAL GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG XINAN CHEM INDAL GROUP
Publication Date
2011-05-11
Estimated Expiration
Not applicable · inactive patent

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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.
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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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