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A kind of technique for continuous production of tetrasodium glutamic acid diacetate

A technology of tetrasodium glutamic acid diacetate and sodium glutamate, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of lack of research and low production efficiency, and achieve easy control and liberation Labor productivity, no by-product effects

Active Publication Date: 2018-01-05
HEBEI CHENGXIN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] US2500019 proposes that sodium cyanide, formaldehyde can be used to produce tetrasodium glutamate diacetate, describes the preparation of this type by reacting an alpha-amino acid with formaldehyde and sodium cyanide, preferably in a strongly alkaline aqueous solution at a temperature of 30-100°C Diacetic acid derivatives, when glutamic acid is used as an α-amino acid, a mixture of glutamic acid-N,N-diacetic acid and α-aminobutyric acid-N,N-diacetic acid is obtained, because the terminal carboxyl group is under strong alkaline conditions Partial removal of carboxyl groups, this process is a batch production method, and the production efficiency is low
[0005] The above-mentioned several preparation methods are all batch or semi-continuous preparation methods, and the method for the complete continuous production of tetrasodium glutamate diacetate is rarely mentioned, while the method for continuously synthesizing glutamic acid diacetate using sodium cyanide Tetrasodium method more without any research

Method used

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  • A kind of technique for continuous production of tetrasodium glutamic acid diacetate

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Experimental program
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Effect test

Embodiment 1

[0022] First adjust the temperature of the first reaction kettle to be controlled at 100°C. Under the action of the pump, the 30% sodium cyanide aqueous solution after the heat exchange treatment of the heat exchange system will be used at a flow rate of 327kg / h, and the 37% formaldehyde solution at a flow rate of 327kg / h. The flow velocity of 162kg / h and 40% glutamic acid sodium salt solution are fed into the first reactor at a flow velocity of 422kg / h, and under strong stirring, act rapidly, and simultaneously, the ammonia gas that hydrolysis generates from the first reactor The top of the reactor is discharged and collected, and the feed liquid stays in the first reactor for 15 minutes. After the first stage reaction is completed, the feed liquid enters the second reactor. Stay in the second reactor for 8 minutes, and at the same time, the ammonia gas generated by the further reaction is further discharged from the top of the second reactor and collected, thereby completing ...

Embodiment 2

[0024] First adjust the temperature of the first reaction kettle to be controlled at 100°C. Under the action of the pump, the 30% sodium cyanide aqueous solution after the heat exchange treatment of the heat exchange system will be used at a flow rate of 350kg / h, and the 37% formaldehyde solution at a flow rate of 350kg / h. The flow rate of 175kg / h and 40% sodium glutamate solution are fed into the first reactor at a flow rate of 422kg / h, and under strong stirring, they act rapidly. The top of the reactor is discharged from the entire system and collected. The feed liquid stays in the first reactor for 20 minutes. After the first stage reaction is completed, the feed liquid enters the second reactor. Stay in the second reactor for 10 minutes. At the same time, the ammonia gas generated by the further reaction is further discharged from the top of the second reactor, thereby completing the entire reaction. After the reaction, the feed liquid enters the storage tank for the next s...

Embodiment 3

[0026] First adjust the temperature of the first reaction kettle to be controlled at 90°C. Under the action of the pump, the 30% sodium cyanide aqueous solution after the heat exchange treatment of the heat exchange system will be used at a flow rate of 327kg / h, and the 37% formaldehyde solution at a flow rate of 327kg / h. The flow rate of 162kg / h and 40% sodium glutamate solution enter the first reaction kettle at a flow rate of 422kg / h, and act rapidly under strong stirring. At the same time, the ammonia gas generated by hydrolysis flows from the top of the first reaction kettle It is discharged from the whole system, and the feed liquid stays in the first reactor for 30 minutes. After the first-stage reaction is completed, the feed liquid enters the second reactor, and the temperature of the second reactor is controlled at 110 ° C. The feed liquid stays in the second reactor for 5 minutes. At the same time, the ammonia gas generated by the further reaction is further discharg...

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Abstract

The invention provides a process for producing tetrasodium glutamate diacetate through a continuous method.Production is conducted through a continuous reactor.The process includes the following steps that A, a sodium glutamate saline solution, a sodium cyanide solution and a formaldehyde solution are used as raw materials and fed into a first reaction kettle to react through a heat exchange system according to the flow speed, and generated ammonia gas is collected at the same time; B, feed liquid generated after reaction in the first reaction kettle is discharged from the bottom of the kettle and directly enters a second reaction kettle to continue to react, and ammonia gas generated in the second reaction kettle is collected at the same time; C, feed liquid reacting in the second reaction kettle is discharged from the bottom of the kettle and enters a storage tank to be subjected to decoloration, filtration and concentration regulation so that a tetrasodium glutamate diacetate solution can be obtained.By means of the process, tetrasodium glutamate diacetate can be continuously produced, the quality of the obtained product is good, the production stability is good, control is easy, and by-products generated by kettle type reaction can be avoided.

Description

technical field [0001] The invention belongs to the technical field of tetrasodium glutamate diacetate, and relates to a production process of tetrasodium glutamate diacetate, in particular to a process for continuously producing tetrasodium glutamate diacetate. The method can continuously produce tetrasodium glutamic acid diacetate, and the obtained product has good quality, good production stability, easy control, and can avoid by-products generated by kettle reaction. Background technique [0002] Tetrasodium glutamic acid diacetate is an important chelating agent, which has a very prominent effect in cleaning and washing, and, in today's increasingly severe environmental protection situation, the carcinogenicity of NTA has led to the limitation of its use, EDTA Problems such as non-degradability and environmental friendliness frequently appear, and tetrasodium glutamic acid diacetate is a substance that is easily biodegradable. [0003] There has been a lot of research ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/18C07C229/16
CPCC07C227/18C07C229/16
Inventor 贾荣荣张艳章李燕李兴波刘旭程丽华郭翠红
Owner HEBEI CHENGXIN
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