Method for continuously synthesizing tetrasodium glutamate diacetate through tubular reactor

A technology of tetrasodium glutamic acid diacetate and tubular reactor, which is applied in the fields of chemical instruments and methods, cyanide reaction preparation, organic compound preparation, etc., and can solve the problem of many reaction by-products, difficult control of product quality, and reaction problems. Long cycle and other issues, to achieve high production efficiency, easy control of product quality, and save labor

Active Publication Date: 2016-09-07
HEBEI CHENGXIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above preparation method uses highly toxic hydrocyanic acid, the product quality is not easy to control, and there are many reaction by-products, and the reaction cycle is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for continuously synthesizing tetrasodium glutamic acid diacetate using a tubular reactor, comprising the steps:

[0029] (1) First, under the action of the pump, the hydroxyacetonitrile aqueous solution with a mass concentration of 51% is continuously fed into the tubular reactor at a rate of 22 kmol / h, and the aqueous solution of glutamic acid monosodium salt with a mass concentration of 40% is continuously entered into the tubular reactor at a rate of 10 kmol / h. Under the action of the tube reactor, stay for 3 minutes, the temperature controlled by the tube reactor is 100°C, the two raw materials react rapidly, and the compound shown in formula I is obtained continuously.

[0030] (2) After the above reaction, the feed liquid enters the hydrolysis device or enters the hydrolysis device continuously, and is hydrolyzed under the action of sodium hydroxide to generate tetrasodium glutamic acid diacetate, and ammonia gas is obtained as a by-product, and the gener...

Embodiment 2

[0032] A method for continuously synthesizing tetrasodium glutamic acid diacetate using a tubular reactor, comprising the steps:

[0033] (1) First, under the action of the pump, the hydroxyacetonitrile aqueous solution with a mass concentration of 51% is continuously fed into the tubular reactor at a rate of 22 kmol / h, and the aqueous solution of glutamic acid monosodium salt with a mass concentration of 40% is continuously entered into the tubular reactor at a rate of 10 kmol / h. Under the action of the tubular reactor, stay for 50 minutes, the temperature controlled by the tubular reactor is 30°C, the two raw materials react rapidly, and the compound shown in formula I is obtained continuously.

[0034] (2) After the above reaction, the feed liquid enters the hydrolysis device or enters the hydrolysis device continuously, and is hydrolyzed under the action of sodium hydroxide to generate tetrasodium glutamic acid diacetate, and ammonia gas is obtained as a by-product, and the...

Embodiment 3

[0036] A method for continuously synthesizing tetrasodium glutamic acid diacetate using a tubular reactor, comprising the steps:

[0037] (1) First, under the action of the pump, the hydroxyacetonitrile aqueous solution with a mass concentration of 51% is continuously fed into the tubular reactor at a rate of 18 kmol / h, and the aqueous solution of glutamic acid monosodium salt with a mass concentration of 40% is continuously entered into the tubular reactor at a rate of 10 kmol / h. Under the action of the type reactor, stay for 20min, the temperature controlled by the tube type reactor is 110°C, the two raw materials react rapidly, and the compound shown in formula I is obtained continuously.

[0038] (2) After the above reaction, the feed liquid enters the hydrolysis device or enters the hydrolysis device continuously, and is hydrolyzed under the action of sodium hydroxide to generate tetrasodium glutamic acid diacetate, and ammonia gas is obtained as a by-product, and the gene...

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PUM

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Abstract

The invention discloses a method for continuously synthesizing tetrasodium glutamate diacetate through a tubular reactor, and relates to the technical field of tetrasodium glutamate diacetate preparation. The method comprises the following steps that 1, a monosodium glutamate salt solution and a hydroxy acetonitrile solution are continuously injected into the tubular reactor, and a compound shown as a formula I (please see the formula in the description) is generated; 2, the generated compound shown as the formula I is hydrolyzed to generate tetrasodium glutamate diacetate and a by-product-ammonia gas under the action of sodium hydroxide, the generated ammonia gas is exhausted, and the etrasodium glutamate diacetate solution is obtained. According to the method, hydrocyanic acid is avoided, the product quality is easy to control, safety and environmental friendliness are achieved, and industrialized production can be achieved; in addition, by-products generated in a kettle reaction can be avoided, the production efficiency is high, labor is greatly saved, and automation control is easy to achieve.

Description

technical field [0001] The invention relates to the technical field of preparation of tetrasodium glutamic acid diacetate. 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 nitrilotriacetic acid (NTA) has led to its use Problems such as the limitation of ethylenediaminetetraacetic acid (EDTA) and the non-degradability of ethylenediaminetetraacetic acid (EDTA) are not friendly to the environment frequently appear. Tetrasodium glutamate diacetate is a readily biodegradable substance. [0003] There has been a lot of research on tetrasodium glutamate diacetate. [0004] Patent DE4122713 mentions the use of glutamic acid, hydrocyanic acid and formaldehyde to react with alkaline hydrolysis to obtain the final product. [0005] Patent WO9622351 mentions that glutamic acid diacet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/24C07C227/26
CPCC07C227/26C07C253/30C07C229/24C07C255/24
Inventor 贾荣荣李燕张艳章侯静静刘旭杨晓林程丽华
Owner HEBEI CHENGXIN
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