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A device and process for applying dimethyl phosphite by-product hydrogen chloride to glyphosate synthesis

A technology of dimethyl phosphite and hydrogen chloride, which is applied in the fields of compounds of group 5/15 elements of the periodic table, organic chemistry, chemical instruments and methods, etc., can solve the problems of increasing the cost of environmental protection treatment, and achieve the improvement of purity and quality, Reduced water usage and energy consumption cost reduction effects

Active Publication Date: 2021-07-13
内蒙古兴发科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In this method, 1 ton of glyphosate produces about 3.6 tons of acidic mother liquor, and a large amount of high-salt mother liquor increases the cost of environmental protection treatment

Method used

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  • A device and process for applying dimethyl phosphite by-product hydrogen chloride to glyphosate synthesis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]A device for synthesizing glyphosate with dimethyl phosphite by-product hydrogen chloride, the dimethyl phosphite tail gas pipeline is connected to compressor one 1, compressor one 1 is connected to primary condenser 2, and primary condenser 2 Connect with compressor two 3, compressor two 3 is connected with secondary condenser 4, secondary condenser 4 is connected with hydrogen chloride gas cabinet 5, hydrogen chloride gas cabinet 5 is connected with gas buffer tank 6, gas buffer tank 6 is connected with hydrolysis mixer 7 is connected, the hydrolysis mixer 7 is connected with the hydrolysis kettle 8, the hydrolysis kettle 8 is connected with the crystallizer 9, the crystallizer 9 is connected with the solid-liquid separation device 11, the solid-liquid separation device 11 is connected with the drying device 13, and the drying device 13 is connected to the product packaging area. The hydrolysis kettle 8 is provided with a solvent recovery device 10; the solid-liquid se...

Embodiment 2

[0032] In the traditional dimethyl phosphite production process, when hydrogen chloride is produced as a by-product, hydrochloric acid is generally recovered first, and then methyl chloride is recovered. In this process, the absorbed water is soft water, and the cost in the production process is relatively high. There are many hydrochloric acid indicators, such as calcium and magnesium ions, etc., and the water intake during the subsequent hydrolysis of glyphosate is increased, which increases the cost of precipitation and post-treatment of mother liquor. In this process, the link of absorbing and reusing hydrochloric acid with soft water is cancelled, and the tail gas by-product of dimethyl phosphite is condensed by pressure and graded to separate hydrogen chloride, methyl chloride and other gases, and hydrogen chloride is directly used in the synthetic acid hydrolysis process . The water (alcohol) solution condensed by the primary condenser during the pressurized condensatio...

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Abstract

The invention provides a method and a device for applying dimethyl phosphite hydrogen chloride tail gas to glyphosate synthesis. The dimethyl phosphite tail gas is transported to the compressor through the pipeline, and after the first-stage pressurized condensation, the high-boiling alcohol aqueous solution and non-condensable gas are obtained, and the non-condensable gas is separated after being cryogenically cooled by the second-stage pressurized condenser The hydrogen chloride gas enters the hydrogen chloride gas tank for storage; the hydrogen chloride gas and the synthetic liquid undergo acidolysis reaction in the hydrolysis kettle, and then enter the cooling crystallization process after heating up, desolventizing, and deacidifying, and then carry out solid-liquid separation through the washing device, and then dry to obtain straw Glyphosate original drug. Pressurize and condense to separate hydrogen chloride and methyl chloride, and then enter the refining process. The separated hydrogen chloride is used in the production of glyphosate, which can reduce the introduction of water in the reaction system, reduce the steam consumption during solvent recovery, and reduce the amount of waste water. The water used for glyphosate production is reduced, the waste water treatment and energy consumption are equally reduced, and the economic and environmental protection benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of glyphosate production by dimethyl phosphite and alkyl ester method, and specifically relates to a method and a device for applying dimethyl phosphite hydrogen chloride tail gas to glyphosate synthesis. Background technique [0002] Glyphosate, also known as Roundup, is a non-selective systemic conduction herbicide. There are two mainstream production methods of glyphosate, one is the production method using iminodiacetic acid (IDA) as the raw material, and the other is the production method using glycine and alkyl phosphite as the raw material. In my country, the synthesis of glyphosate by the glycine-alkyl ester method occupies a dominant position. The specific process is as follows: triethylamine is used as a catalyst, and paraformaldehyde is depolymerized in the solvent methanol to form hemiacetal, which is further reacted with glycine and then combined with Dimethyl phosphite is esterified, and then t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/38C07C17/38C07C19/03
CPCC07C17/38C07F9/3813C07C19/03
Inventor 许长泽胡波黄明华黄丹丹包俸川
Owner 内蒙古兴发科技有限公司