Recycling process of methyl sulcotrione solvent

Abstract

The invention discloses a recycling process of a methyl sulcotrione solvent. The recycling process comprises the following steps: transferring a methyl sulcotrione dichloroethane solution which is subjected to condensation and rearrangement and contains triethylamine into a triethylamine salifying kettle and adding water under the condition that the volume ratio of dichloroethane to the water is 1 to (1-5) (v / v) (Volume Per Volume), starting stirring, slowly dripping a 80% to 91% dilute sulphuric acid solution according to the condition that the molar ratio of the triethylamine to the dilute sulphuric acid is 1 to (0.5-0.8) (mol / mol), regulating pH within 1 to 1.5, stirring for 15 minutes, separating out a methyl sulcotrione dichloroethane solution at a lower layer, and carrying out reduced pressure distillation for recycling the dichloroethane containing the water; putting a triethylamine sulfate aqueous solution at an upper layer into a storage tank; and simultaneously treating the obtained dichloroethane containing the water and the triethylamine sulfate aqueous solution. According to the recycling process, an acid-base neutralization salifying theory is adopted; the performances of dehydration and water absorption of materials are utilized, so that the whole recycling process is low in energy consumption, low in cost, mutually complementary, less in equipment investment and simple to operate, and is used for completely solving the problems of high cost and high energy consumption of the solvent separated in a distillation recycling manner. Thus, the recycling process disclosed by the invention conforms to the ideals of energy conservation and emission reduction in China.

Description

technical field [0001] The invention belongs to the field of resource recycling and environmental protection, and in particular relates to a solvent recovery process in the synthesis of mesotrione. Background technique [0002] The full name of mesotrione is 2-(4-methylsulfonyl-2-nitro-benzoyl)cyclohexane-1,3-dione, which is a triketone herbicide developed by Syngenta, and is known as The trade name callisto (Mistone) was sold in Europe in 2001. It is a broad-leaf herbicide before and after buds in corn fields. It is not only safe for corn fields, but also safe for the environment and subsequent crops. It is a broad-spectrum herbicide that can control many weeds such as cocklebur, velvetleaf, Artemisia annua, lettuce, thorn, and tribulus. Urea herbicides are effective in developing resistant weeds. [0003] At present, the process of producing mesotrione at home and abroad mainly uses p-thiamphenicol toluene as the main raw material, which is nitrated and oxidized to synth...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a new process for solvent recovery of mesotrione, which can overcome the problems of high energy consumption and high cost of rectification. Apply directly, reduce energy consumption, reduce waste water discharge, simplify operation and reduce cost