A kind of production technology of bifenthrin

Abstract

The invention discloses a production process of bifenthrin. The production process comprises the following steps: mixing 2-methyl-3-phenyl benzyl alcohol and a catalyst, putting in a reaction vessel,increasing the temperature to 10-60 DEG C to a molten state, dropwise adding 3-(2-chlorine-3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropane methyl halide under the condition of a certain negativepressure, absorbing negative-pressure tail gas by using tertiary water to obtain by-product acid; after the completion of dropwise adding, performing thermal-insulation reaction for 1-3 hours at a temperature of 10-60 DEG C, ending the reaction when the 2-methyl-3-phenyl benzyl alcohol is controlled to be less than 0.1 percent, performing product washing treatment, directly standing, layering andremoving water to obtain the bifenthrin. The production process disclosed by the invention has the beneficial effects that a solvent required for bifenthrin synthesis is cancelled, the subsequent treatment is simple, no re-crystallization treatment is required, by-product halogen acid is recovered, other three wastes are not generated, and the quality of the obtained bifenthrin is obviously improved. The production process disclosed by the invention has the advantages that the processes are simple, the product quality is high, the economy is improved through the by-product halogen acid, and the requirements for industrial clean production are met.

Description

technical field [0001] The invention relates to a production method of a compound, in particular to a production process of bifenthrin. Background technique [0002] Bifenthrin is a highly efficient pyrethroid insecticide and acaricide, which has the characteristics of high efficiency, low toxicity, and low residue. It is mainly used to control various Lepidoptera larvae, whiteflies, aphids, herbivorous The main mode of action of spider mites and other pests is contact killing and stomach poisoning. At present, bifenthrin has been widely used in the market. [0003] The current method for industrialized production is basically to use 2-methyl-3-benzyl benzyl alcohol in an acid-binding agent and a corresponding solvent, and 3-(2-chloro-3,3,3-trifluoro-1-propene base)-2,2-dimethylcyclopropanecarbonyl chloride for chemical reaction to generate bifenthrin, which is synthesized by water phase method in this process and produces a large amount of high-salt waste water with a cont...

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Problems solved by technology

[0006] Chinese patent CN103145558A introduces the use of permethrin to carry out ester synthesis with methanol first, and then carry out transesterification with biphenyl alcohol to obtain bifenthrin. Larger, long reaction time, and in the process of transesterification, an excess of biphenyl alcohol is usually required, resulting in a low conversion rate of about 93%, and the residual biphenyl alcohol has a greater impact on the quality of bifenthrin

[0007] In addition, some manufacturers still use pyridine as an acid-binding agent for oil-phase synthesis. This method produces a large amount of pyridine wastewater, which is difficult to treat and has a strong smell, which does not meet the requirements of clean production.

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