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

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...

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Problems solved by technology

[0008] This method is easy to operate but has the disadvantages of being highly dependent on graphite condensers, poor 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 liquid system composed of (D) has a large total amount of materials, a large logistics load (1.5 times that of the liquid phase) and a large proportion of methyl chloride components (accounting for 30% of the total tail gas) compared with the liquid phase route, resulting in Recycling system is not working properly

Especially in the event of an emergency power failure, a large amount of methylal (A), methanol (B), and methyl chloride (D) material systems are discharged from the emergency pressure relief system to release pressure. Therefore, poor operation stability presents great safety and environmental protection risks

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