Novel preparation method of green chelating agent tetrasodium glutamate diacetate

A technology of sodium glutamate diacetate and sodium glutamate, which is applied in the preparation of organic compounds, chemical instruments and methods, and preparation of cyanide reactions, etc. It can solve the problem of equipment damage, difficult treatment of toxic waste water, and impact on product quality, etc. problems, achieve the effect of reducing by-products, simple and mild reaction conditions, and improving atom utilization

Active Publication Date: 2020-12-04
HENAN QINGSHUIYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Japanese Patent JP1987039554A mentions the method about utilizing sodium cyanide to prepare alkyl amino acid; The use of the mixture is mainly used in detergents; European patent EP1004571 has announced the method for preparing high-purity glutamic acid diacetic acid sodium salt, which has improved the use value of the product; Chinese patent CN101784513B has proposed about using sodium glutamate, hydrogen Cyanic acid and formaldehyde prepare the method for glutamic acid diacetic acid sodium salt, but still do not avoid the use of highly toxic substances such as cyanide, produce toxic waste water and be difficult to handle; Chinese patent CN109369427A proposes using sodium glutamate, chloroacetic acid as raw The method of preparing glutamic acid diacetic acid sodium salt, but the product contains a large amount of chloride ions, which not only affects the quality of the product, but also causes damage to some equipment used

Method used

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  • Novel preparation method of green chelating agent tetrasodium glutamate diacetate

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Experimental program
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Effect test

Embodiment 1

[0028] 936g sodium glutamate monohydrate and 702g deionized water are added to the reactor, stirred and mixed evenly at room temperature, 1727g glyoxylic acid (mass fraction is 45%), 530g formic acid (mass fraction is 88%) and 980g sodium hydroxide The solution (mass fraction is 32%) was separately loaded into the dropping device for standby. Raise the temperature of the reaction system to 90°C, start adding glyoxylic acid dropwise, control the drop rate, keep the reaction temperature at 90°C, complete the dropwise addition in 1.5 hours, and keep warm for 1 hour after the dropwise addition. After the heat preservation is completed, the temperature of the reaction system is raised to 95°C, and the dropwise addition of formic acid is started, and the drop rate is controlled to keep the reaction temperature at 95°C, and the dropwise addition is completed in 2 hours. Remove excess water from the reaction. Start to add liquid caustic soda dropwise, control the temperature to less ...

Embodiment 2

[0030] 936g sodium glutamate monohydrate and 936g deionized water are added to the reactor, stirred and mixed evenly at room temperature, 2056g glyoxylic acid (mass fraction is 45%), 445g formic acid (mass fraction is 88%) and 1080g sodium hydroxide The solution (mass fraction is 32%) was separately loaded into the dropping device for standby. Raise the temperature of the reaction system to 60°C, start adding glyoxylic acid dropwise, control the dropping rate, keep the reaction temperature at 60°C, complete the dropwise addition in 2 hours, and keep warm for 1 hour after the dropwise addition. After the heat preservation is completed, the temperature of the reaction system is raised to 75°C, and the dropwise addition of formic acid is started, and the rate of addition is controlled to keep the reaction temperature at 75°C, and the dropwise addition is completed in 2 hours. Remove excess water from the reaction. Start to add liquid caustic soda dropwise, control the temperatur...

Embodiment 3

[0032] 936g sodium glutamate monohydrate and 1158g deionized water were added to the reactor, stirred and mixed evenly at room temperature, 1727g glyoxylic acid (mass fraction was 45%), 530g formic acid (mass fraction was 88%) and 1030g sodium hydroxide The solution (mass fraction is 32%) was separately loaded into the dropping device for standby. Raise the temperature of the reaction system to 65°C, start adding glyoxylic acid dropwise, control the rate of addition, keep the reaction temperature at 65°C, complete the dropwise addition in 4 hours, and keep warm for 1 hour after the dropwise addition. After the heat preservation is completed, the temperature of the reaction system is raised to 95°C, and the dropwise addition of formic acid is started, and the rate of addition is controlled to keep the reaction temperature at 95°C, and the dropwise addition is completed in 3 hours. Remove excess water from the reaction. Start to add liquid caustic soda dropwise, control the tem...

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Abstract

The invention relates to a preparation method of tetrasodium glutamate diacetate, belonging to the technical field of organic synthesis. The preparation method comprises the following steps: with sodium glutamate, glyoxylic acid and formic acid as raw materials, subjecting glyoxylic acid and sodium glutamate to a sufficient reactionat a certain temperature, and then generating an aqueous tetrasodium glutamate diacetate solution under the action of formic acid. According to the invention, sodium glutamate, glyoxylic acid and formic acid used in the method are easily available raw materials, byproducts are mainly water and carbon dioxide, highly toxic substances such as cyanide and the like are abandoned, and generation of a large amount of wastewater and toxic byproducts are avoided; usageof chloroacetic acid as a raw material is also discarded, so the influence of chloride ions in the product on some use scenes is prevented; and the method is green, economical, environment-friendly and easy for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis and provides a preparation method for synthesizing a green chelating agent glutamic acid diacetic acid sodium salt by using sodium glutamate and glyoxylic acid as raw materials. Background technique [0002] Glutamic acid diacetic acid sodium salt (GLDA) is a green chelating agent widely used in the market. Glutamic acid diacetic acid sodium salt has a strong metal chelating ability, which is similar to aminotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), sodium tripolyphosphate (STTP) and other properties. Among them, NTA is a suspected carcinogen that has been banned in Europe and the United States, EDTA is not easily biodegradable, and STTP contains phosphorus, which is likely to cause eutrophication of rivers and lakes, and all three of them will cause harm to the environment and human body. Under the requirement of phosphorus-free, and considering the negative impact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/24C07C227/18C07C227/40
CPCC07C227/18C07C227/40C07C229/24
Inventor 敬元元张鑫卢亚楠邱培辉贺潇潇姚金钱刘迎迎原金妮
Owner HENAN QINGSHUIYUAN TECH
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