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Method for producing glyphosate by comprehensively utilizing glycine crystallization mother liquor

A technology of crystallizing mother liquor and glycine, which is applied in the field of pesticides, can solve the problems of high equipment and catalyst requirements, difficult biochemical treatment, by-product formaldehyde, etc., and achieve social and economic benefits, simplification of reaction procedures, and reduction of material consumption and energy consumption. Effect

Inactive Publication Date: 2014-03-19
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods all have unavoidable shortcoming, at first, use iminodiacetonitrile as starting material, the production cost of glyphosate is lower, but every ton of glyphosate will produce nearly 10 tons of waste liquid, and these Biochemical treatment of waste liquid is relatively difficult; moreover, chlorine dioxide and hydrogen peroxide are mostly used to produce glyphosate by oxidation of diglyphosate, but the cost is relatively high; although the air oxidation method is efficient, it has high requirements for equipment and catalysts , especially the recovery of metal ions of the catalyst is difficult
Although the use of iminodiacetic acid as a starting material can greatly reduce the discharge of waste water, it also faces the problem of producing glyphosate from diglyphosate
Regardless of whether iminodiacetonitrile or iminodiacetic acid is used as the starting material, there is a problem of recovery of by-product formaldehyde in the process of oxidation of diglyphosate

Method used

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  • Method for producing glyphosate by comprehensively utilizing glycine crystallization mother liquor
  • Method for producing glyphosate by comprehensively utilizing glycine crystallization mother liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Glycine crystallization mother liquor neutralization reaction, its concrete operation is as follows:

[0042] Weigh 507 grams of glycine crystallization mother liquor (wherein the content of glycine is 14%, and the content of iminodiacetic acid is 16%) and placed in a 2000mL four-necked flask equipped with a stirrer, a thermometer, a constant pressure dropping funnel, and a condenser, and then add 155 grams of 40% aqueous sodium hydroxide solution is heated and decompressed and the ammonia in the system is completely removed.

[0043] Chloroacetic acid is converted into sodium chloroacetate aqueous solution, and its concrete operation is as follows:

[0044] Weigh 100 grams of chloroacetic acid and place it in a 500mL beaker, add 300 grams of water, then slowly add 104 grams of 40% aqueous sodium hydroxide solution dropwise, and control the neutralization temperature not to exceed 60°C. After the dropwise addition, we get Sodium chloroacetate in water.

[0045] Slowly...

Embodiment 2

[0051] Glycine crystallization mother liquor neutralization reaction, its concrete operation is as follows:

[0052] Weigh 507 grams of glycine crystallization mother liquor (the content of glycine is 14%, the content of iminodiacetic acid is 16%) and put it in a 2000mL four-neck flask equipped with stirrer, thermometer, constant pressure dropping funnel and condenser, and then add 40 % sodium hydroxide aqueous solution 155 grams, the ammonia in the system is completely removed by heating and decompression.

[0053] Chloroacetic acid is converted into sodium chloroacetate aqueous solution, and its concrete operation is as follows:

[0054] Weigh 100 grams of chloroacetic acid and place it in a 500mL beaker, add 300 grams of water, then slowly add 104 grams of 40% aqueous sodium hydroxide solution dropwise, and control the neutralization temperature not to exceed 60°C. After the dropwise addition, we get Sodium chloroacetate in water.

[0055] Slowly add the obtained sodium c...

Embodiment 3

[0061] The neutralization reaction of glycine crystallization mother liquor, its concrete operation is as follows:

[0062] Weigh 507 grams of glycine crystallization mother liquor (the content of glycine is 14%, the content of iminodiacetic acid is 16%) and place it in a 2000mL four-necked flask equipped with a stirrer, thermometer, constant pressure dropping funnel and condenser, and then add 40 % sodium hydroxide aqueous solution 155 grams, the ammonia in the system is completely removed by heating and decompression.

[0063] Chloroacetic acid is converted into sodium chloroacetate aqueous solution, and its concrete operation is as follows:

[0064] Weigh 100 grams of chloroacetic acid and place it in a 500mL beaker, add 300 grams of water, then slowly add 104 grams of 40% aqueous sodium hydroxide solution dropwise, and control the neutralization temperature not to exceed 60°C. After the addition is completed, we get Sodium chloroacetate in water.

[0065] Slowly add the ob...

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Abstract

The invention belongs to the technical field of pesticides, and relates to a method for producing glyphosate by comprehensively utilizing a glycine crystallization mother liquor. The method comprises the following steps: carrying out a chemical reaction of glycine residual in the glycine mother liquor to convert glycine into an iminodiacetate-containing mother liquor, reacting the iminodiacetate mother liquor with phosphorus trichloride for converting iminodiacetate, adding formaldehyde, adjusting the pH to obtain an N-phosphonomethyliminodiacetic acid mixture, and oxidizing the mixture to obtain N-phosphonomethylglycine. The method effectively utilizes glycine residual in the waste mother liquor and iminodiacetic acid to produce glyphosate, so the glycine crystallization mother liquor is effectively comprehensively utilized, the emission of three wastes in the glycine production and the waste of the glycine resource are reduced, social and economic benefits are created, and a glycine crystallization mother liquor treatment problem is well solved.

Description

technical field [0001] The invention belongs to the technical field of pesticides, and relates to a method for producing glyphosate by using glycine crystallization mother liquor. Background technique [0002] Glycine is an important raw material in chemical, pharmaceutical, pesticide and other industrial production, and has a wide range of uses. In recent years, most of the production methods of glycine adopt the hydroxyacetonitrile route to produce glycine, such as the method disclosed in the invention patent with application number 201110351893.0. The method is: react hydroxyacetonitrile with ammonia to obtain aminoacetonitrile, and then hydrolyze aminoacetonitrile to obtain glycine Sodium aqueous solution, sodium glycinate aqueous solution is neutralized by acid to obtain glycine, and glycine is obtained. In the preparation process, the hydrolysis of aminoacetonitrile is divided into acid hydrolysis and alkali hydrolysis, such as JP-A-2-286651, JP-A-04-066559, JP-A-02-3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38
Inventor 吴传隆丁永良秦岭王用贵朱丽利杨帆任星宇陈宏杨李欧
Owner CHONGQING UNISPLENDOUR CHEM
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