A kind of methylal refining process equipment and method for producing glyphosate by-products by glycine method

Abstract

The invention discloses process equipment and a process method for refining dimethoxymethane in byproducts produced in the production of glyphosate by a glycine method. The equipment comprises a light component removing tower, a methanol removing tower, a pressurizing power and a methanol reflux tower, wherein each tower top of the light component removing tower, the methanol removing tower, the pressurizing power and the methanol reflux tower is connected with a condenser and a reflux tank in sequence through pipelines, and reflux is formed by communicating a reflux pump with each tower top; meanwhile, a reboiler is arranged on the bottom of each tower bottom; the bottom of the light component removing tower is provided with a material discharge pipe and is connected with the methanol removing tower through a material discharging pump; the bottom of the methanol removing tower is also provided with a material discharging pipe and is connected with a material inlet of the methanol reflux tower through another material discharging pump; an outlet of the reflux pump at the tower top of the methanol removing tower is provided with a branch pipe and is connected with a material inlet of the pressurizing tower; product outlets are formed in the bottoms of both the pressurizing tower and the methanol reflux tower. According to the process equipment and the process method, the dimethoxymethane in the byproducts of the glyphosate is refined and recycled effectively, so that the waste emission and environment pollution are reduced, the production benefits are improved, the additional value of the byproduct of the glyphosate is greatly improved, and waste is turned into treasure.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology and equipment, and mainly relates to a method for refining methylal in by-products of glyphosate produced by a glycine method. Background technique [0002] Glyphosate is a broad-spectrum organophosphorus herbicide. It is a non-selective herbicide for post-emergent systemic, conduction, and kill. It has excellent biological characteristics and cannot be replaced by other herbicides at present. At present, the mainstream process for the production of glyphosate in my country is the glycine method (dialkyl phosphite method), which uses glycine as the starting material to obtain glyphosate through addition, condensation and hydrolysis of paraformaldehyde and dimethyl phosphite. Glyphosate. The solvent methanol will generate methylal during the depolymerization process of paraformaldehyde. In the mother liquor concentration process, in the process of recovering methanol, about 0...

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Problems solved by technology

[0004] The traditional process of producing methylal uses concentrated sulfuric acid or acidic resin catalysts to carry out reactive distillation or intermittent reaction of methanol solution and formaldehyde solution in a synthesis tower. Since methanol is in a liquid state during the reaction, the reaction product is methylated. Aldehyde and methanol are easy to form a co-solution, and the co-solution is not easy to separate from methylal, thus affecting the quality of the product methylal

The unreacted methanol solution is directly discharged, resulting in waste of materials and excessive methanol content in wastewater, polluting the environment

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