Alkyl ester method glyphosate solvent recovery system and process based on three-stage condensation

A technology of alkyl ester method and recovery system, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of poor intrinsic safety, large logistics load, and low energy consumption of phase transition, and avoid the Large logistics load, reduced steam consumption, and improved intrinsic safety

Pending Publication Date: 2018-08-03
HUBEI TAISHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This method is easy to operate but has the disadvantages of being highly dependent on graphite condensers, poor in intrinsic safety and high energy consumption: the hydrolysis tail gas of this process is acidic gas containing a large amount of hydrogen chloride, so it is highly dependent on graphite condensers
[0010] This method has less phase change and low energy consumption, but has the disadvantages of poor operation stability: First, the remaining tail gas after hydrolyzing the tail gas to remove hydrogen chloride gas is composed of methylal (A)-methanol (B)-water (C)-chloromethane The quaternary mixed liq

Method used

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  • Alkyl ester method glyphosate solvent recovery system and process based on three-stage condensation
  • Alkyl ester method glyphosate solvent recovery system and process based on three-stage condensation

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Embodiment 1

[0047] A three-stage condensation-based alkyl ester method glyphosate solvent recovery system, including a primary tail gas condenser 6, an aqueous solution collection tank 8, a primary rectification tower 9, a secondary tail gas condenser 13, and a methanol solution collection tank 15 , two-stage rectification tower 16, three-stage tail gas condenser 20, methylal solution collection tank 21, three-stage rectification tower 22, the glyphosate hydrolysis tail gas pretreatment system produced by the alkyl ester method passes through the first-stage tail gas condenser 6 is connected with the aqueous solution collection tank 8, the aqueous solution collection tank 8 is connected with the primary rectification tower 9, the primary rectification tower 9 is connected with the methanol solution collection tank 15 through the pipeline, and the bottom of the primary rectification tower 9 is connected to the decontamination station 28 ;

[0048] The primary exhaust gas condenser 6 is con...

Embodiment 2

[0067] A kind of alkyl ester method based on above-mentioned system produces glyphosate solvent recovery process, and its concrete steps are as follows:

[0068] The mixture of hydrogen chloride, methyl chloride, methanol, methylal, and water vapor from the glyphosate hydrolysis station enters the tail gas neutralization tower together with liquid caustic soda and neutralizes to a pH of 7-14, removes the acidic components in the tail gas, and then The first, second, and third stage condensers carry out pressure control, staged condensation and separation, and the condensate goes to the aqueous solution collection tank, methanol solution collection tank, and methylal solution collection tank respectively; the aqueous solution collection tank, methanol solution collection tank, and methylal solution The aqueous solution, methanol solution, and methylal solution in the collection tank are decompressed and then rectified and purified; the non-condensable gas is sent to the methyl c...

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Abstract

The invention belongs to an alkyl ester method glyphosate solvent recovery system and method, and particularly relates to recovery equipment and process for tail gas with the major ingredients of hydrogen chloride, methylal, methanol, methyl chloride and water generated after the synthesis liquid hydrolysis in the alkyl ester method glyphosate production process. The equipment and the process provided by the invention thoroughly weed out a graphite condenser highly relied in the conventional liquid phase recovery process. Compared with a conventional gas phase recovery process, the equipment and the process provided by the invention have the stable system pressure. Compared with a liquid phase recovery process, the equipment and the process provided by the invention have the advantage thatthe ton glyphosate steam consumption is reduced by 2.6t; safety and energy-saving benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of solvent recovery for producing glyphosate by an alkyl ester method. Background technique [0002] Glyphosate is a high-efficiency, low-toxicity, broad-spectrum, destructive, non-selective herbicide with excellent biological characteristics. Currently, there are two mainstream production processes for glyphosate in China: the alkyl ester method and the iminodiacetic acid method. The production process abroad is mainly the iminodiacetic acid method of Monsanto Company in the United States, and the mainstream process for glyphosate production in my country is the alkyl ester method. The alkyl ester method is mainly the glycine-dialkyl phosphite method, and there are also small chloroacetic acid-alkyl ester methods that use chloroacetic acid as the starting material to produce glyphosate and the glycine-trimethyl phosphite method, etc. public routes. [0003] Brief Introduction of Glyphosate Solvent Recove...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/58C07C29/80C07C31/04C07C19/03C07C17/38
CPCC07C17/38C07C29/80C07C41/58C07C43/30C07C31/04C07C19/03
Inventor 胡波黄明华黄丹丹李晓晴张元成
Owner HUBEI TAISHENG CHEM
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