Alkyl ester method glyphosate solvent recovery system and process

Abstract

The invention provides an alkyl ester method produced glyphosate solvent recovery method. A diluted methanol solution collection tank is connected with the upper part of a primary rectifying tower through a pipeline, and the primary rectifying tower is connected with a return tank I through a condenser I; the return tank I is connected with a methyl alcohol methylal solution intermediate tank; themethyl alcohol methylal solution intermediate tank is connected with a secondary rectifying tank, a return tank II is connected to a methyl alcohol methylal finished product tank, and the secondary rectifying tank is connected to a methyl alcohol finished product tank. The recovery process comprises the following steps: enabling diluted methanol inside the diluted methanol solution collection tank to enter into the primary rectifying tower, enabling gas inside the primary rectifying tower to condense through the condenser to return back to the return tank, and feeding to the methyl alcohol methylal solution intermediate tank; feeding to the methyl alcohol finished product tank from a secondary rectifying tower extraction pump, condensing liquid at the bottom of the tower through the condenser and then feeding to the methyl alcohol finished product tank. According to the equipment and process provided by the invention, the defect that a traditional liquid-phase recovery process highlydepends on a graphite condenser and the problem that a traditional gas-phase recovery process is unstable in operation are solved, the process has the characteristics of energy saving and economical efficiency, and the steam consumption of glyphosate is 1.2t.

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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