Production process of chloropinacolone

Abstract

The invention relates to a chloropinacolone production process, which comprises: 1, adding a pinacolone-methanol solution into a reaction kettle, starting a stirring and cooling system, and reducing the temperature of the pinacolone-methanol solution in the reaction kettle to less than 0 DEG C; 2, starting a circulating pump, repeatedly circulating the pinacolone-methanol solution from a circulating discharge port to a feed port of the reaction kettle, arranging a chlorine adding device on a circulating pipeline, introducing chlorine into the pinacolone-methanol circulating solution by the chlorine adding device, and repeatedly circulating until the reaction is finished; and 3, heating and desolventizing the reaction mother liquor obtained in the step 2, and cooling the desolventized feed liquid to obtain the chloropinacolone. The invention provides a production process of chloropinacolone, which can improve the production yield of chloropinacolone, reduce the production time, improve the production efficiency and reduce the consumption of raw materials.

Description

technical field [0001] The invention relates to a production process of chloropinatone, which belongs to the technical field of pesticide production. Background technique [0002] Chloropinatone is an important organic chemical intermediate. Its chemical name is 1-chloro-3,3-dimethyl-2-butanone. Chloropinatone can undergo condensation reaction with many compounds, widely It is applied in the field of preparing pesticide production. Chloropinatone is produced by chlorination of pinacolone. The current production process uses methanol as a solvent for liquid-phase chlorination. Chlorine gas is directly passed into the methanol solution of pinacolone below zero. After reacting for 24 hours, monochloropinatone was obtained. This production method needs to pass into excessive chlorine gas due to the long reaction time of chlorine gas and pinatonone, and the reaction selectivity is poor. During the process, byproducts such as dichloropinatone can be produced, and the obtained Ch...

AI Technical Summary

Problems solved by technology

Chloropinatone is produced by chlorination of pinacolone. The current production process uses methanol as a solvent for liquid-phase chlorination. Chlorine gas is directly passed into the methanol solution of pinacolone below zero. After reacting for 24 hours, monochloropinatone was obtained. This production method needs to pass into excessive chlorine gas due to the long reaction time of chlorine gas and pinatonone, and the reaction selectivity is poor. During the process, byproducts such as dichloropinatone can be produced, and the obtained Chloropinatone has a turbid appearance, high viscosity, and low content. The product purity can only reach about 90%. In severe cases, even stratification may occur. Subsequent rectification is required to obtain more than 98% of Chloropinatone products , and the content of residual chlorine and hydrogen chloride in the tail gas is high, the reaction time is long, the material loss is high, and the production yield is also low

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