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A kind of preparation method of methyl glycine diacetic acid alkali metal salt

A technology of methylglycine and metal salts, which is applied in the field of preparation of methylglycine diacetic acid alkali trisodium salt, can solve the problems of high production cost, large environmental impact, and large energy consumption, and achieve low production cost and low environmental impact. Small and safe effect

Active Publication Date: 2019-03-19
WEIFANG YUANJIE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In these two synthetic routes, the requirements for the purity of raw materials are relatively high, and both use cyanide as the main raw material. Cyanide is highly toxic and has a great impact on the environment.
The synthesis process needs to be equipped with high-purity reaction raw material refining equipment, the production cost is high, the energy consumption is large, and the refining process will generate waste water, causing serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 600ml of methanol to a 1000ml four-neck flask A with a reflux condenser, add 189g (2.0mol) of chloroacetic acid, slowly add 180g (4.5mol) of sodium hydroxide under stirring, heat the electric heating mantle to reflux, react for 8 hours, and the reaction is complete After that, remove the generated NaCl by filtration while it is hot; the filtrate is transferred to the four-necked flask B, and 400ml of methanol is evaporated to obtain a high-concentration methanol solution of the reaction product for use. In another 1000ml four-neck flask C, add 400ml deionized water, add 89g (1mol) L-alanine, add 40g (1mol) sodium hydroxide under stirring, let L-alanine and sodium hydroxide react in water reaction to obtain an aqueous solution of L-alanine sodium. Add the aqueous solution of sodium L-alanine into four-necked flask B to form a mixed system, distill the mixed system to remove methanol; transfer the mixed system from which methanol has been removed to a 1000ml agitated ...

Embodiment 2

[0030] Add 600ml of methanol to a 1000ml four-neck flask A with a reflux condenser, add 142g (1.5mol) of chloroacetic acid, slowly add 130g (3.25mol) of sodium hydroxide under stirring, heat the electric heating mantle to reflux, react for 6 hours, and the reaction is complete Afterwards, filter while hot to remove the NaCl generated, and the filtrate is transferred to the four-necked flask B, and 400ml of methanol is evaporated to obtain a high-concentration methanol solution of the reaction product for use. In another 1000ml four-neck flask C, add 500ml deionized water, add 67g (0.75mol) L-alanine, add 30g (0.75mol) sodium hydroxide under stirring, let L-alanine and sodium hydroxide The reaction is carried out in water to obtain an aqueous solution of sodium L-alanine. Add the aqueous solution of sodium L-alanine into the four-necked flask B to form a mixed system, distill the mixed system to remove methanol, transfer the mixed system from which methanol has been removed to ...

Embodiment 3

[0032] Add 600ml of ethanol to a 1000ml four-necked flask A with a reflux condenser, add 142g (1.5mol) of chloroacetic acid, slowly add 120g (3.0mol) of sodium hydroxide under stirring, heat the electric heating mantle to reflux, react for 6 hours, and the reaction is complete Filtrate while hot to remove the NaCl that generates afterward, and the filtrate is transferred in the four-necked flask B as the ethanol solution of the reaction product of low concentration to stand-by. In another 1000ml four-neck flask C, add 300ml deionized water, add 67g (0.75mol) L-alanine, add 30g (0.75mol) sodium hydroxide under stirring, let L-alanine and sodium hydroxide The reaction is carried out in water to obtain an aqueous solution of sodium L-alanine. Add the aqueous solution of sodium L-alanine into four-necked flask B to form a mixed system, distill the mixed system to remove ethanol, transfer the mixed system from which ethanol has been removed to a 1000ml agitated autoclave, add 3g of...

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PUM

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Abstract

The invention relates to a preparation method of methylglycine diacetic acid alkali metal salt. The preparation method comprises the following specific steps: by taking L-alanine and chloroacetic acid as raw materials, enabling the chloroacetic acid to reflux in a solvent together with strong alkali corresponding to an alkali metal such as sodium hydroxide and potassium hydroxide, thus generating glycolic acid alkali metal salt, performing neutralization by using the L-alanine, thus generating corresponding alkali metal salt, and dehydrating the glycolic acid alkali metal salt and the L-alanine under existence of a catalyst such as titanium dioxide, aluminum oxide and silicon oxide at certain temperature and pressure, thus generating alkali metal salt corresponding to methylglycine diacetic acid (MGDA). According to the method, the yield of the glycolic acid alkali metal salt generated from the chloroacetic acid is 98 percent or higher; the highest total yield of the methylglycine diacetic acid alkali metal salt is 95 percent. No ammonia gas and hydrocyanic acid substances exist in the raw materials, so that the generation safety is high, and no extremely toxic substances are generated; furthermore, no NTA exists in the product; the preparation method is high in yield, low in production cost and small in environmental impact.

Description

technical field [0001] The invention relates to a common compounding agent, a method for preparing an alkali metal methylglycine diacetate, especially an alkali trisodium methylglycine diacetate. Background technique [0002] Complexing agents include chelating agents, which are widely used in mineral flotation, electroplating process, cleaning agent production, pharmaceutical chemical industry and dyeing industry due to their good coordination properties of metal ions. Methylglycine diacetic acid (MGDA) is an excellent compounding agent. Compared with other traditional complexing agents (such as polycarboxylates, aminopolyphosphates, aminopolycarboxylates), methylglycine diacetic acid (MGDA) and its alkali metal salts have good coordination performance, are safe, non-toxic and easy to The advantages of degradation, its use and synthesis method are described in multiple patents CN101171226A and CN100580072C, CN1977036B, CN101029208A, CN106147734A, CN106148030A, CN105754753A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/02C07C229/16
CPCC07B2200/07C07C51/367C07C227/02C07C227/18C07C229/16C07C229/12C07C59/06
Inventor 潘明顾丽雅孟庆浩魏征何敬一
Owner WEIFANG YUANJIE ENVIRONMENTAL PROTECTION TECH CO LTD