Method and device for preparing O-methyl thiophosphoryl dichloride from thiophosphoryl chloride

Abstract

The invention discloses a method and a device for preparing O-methyl thiophosphoryl dichloride from thiophosphoryl chloride. The method utilizes a three-stage reaction unit series mode, a first-stage reaction unit comprises a stirring reaction kettle and a cooling medium system, a raw material containing thiophosphoryl chloride and methyl alcohol is continuously added into through an inlet of a circulation pump, the raw material is cooled by a cooling medium system to be sent into the stirring reaction kettle, a part of material flow generated by reaction of the stirring reaction kettle can automatically flow into a second-stage reaction unit through liquid level difference, a part of material flow is conveyed to the cooling medium system by the circulation pump to be cooled and returned to the stirring reaction kettle, the second-stage reaction unit and a third-stage reaction unit are communicated through a horizontal pipeline to jointly form a U-shaped material flow channel, and self oscillation can be generated in a material flow flowing process. The preparation method disclosed by the invention has the advantages of high reaction speed, large production capacity, low energy consumption and good product quality.

Description

technical field [0001] The invention belongs to the technical field of chemical reactors, and in particular relates to a method and a device for preparing O-methylphosphorylthiodichloride from phosphorus trichloride. Background technique [0002] O-Methyl thiophosphoryl dichloride is widely used in the synthesis of acephate, pyrimethion, vegetable and fruit phosphorus, isocarbophos, pyrimiphos-methyl, fenitrothion, fenthion, chlorpyrifos-methyl , Methamidophos, methyl parathion and other pesticides. As an intermediate of organophosphorus pesticides, its production process includes batch production process and continuous production process. Among them, the batch production process uses enamel stirring reactor (built-in double-layer coil to enhance heat transfer) as a device for production. The device exists The defects of poor heat transfer ability and high energy consumption. The continuous production method is as follows: the raw material is fully mixed with the pump, and...

AI Technical Summary

Problems solved by technology

As an intermediate of organophosphorus pesticides, its production process includes batch production process and continuous production process. Among them, the batch production process uses enamel stirring reactor (built-in double-layer coil to enhance heat transfer) as a device for production. The device exists Defects of poor heat transfer ability and high energy consumption

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