Green Synthesis of Methyl Chlorides

A technology of green synthesis and methyl sulfide, which is applied in the field of green synthesis of methyl-chloride, can solve the problems of poor stability of methyl-chloride, high environmental protection pressure, and difficult filtration, so as to avoid the odor of elastic sulfur and a large amount of Saline wastewater, no waste of sulfur atoms, and low overall cost
CN110483568BActive Publication Date: 2022-03-08湖北驰顺化工有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
湖北驰顺化工有限公司
Publication Date
2022-03-08

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Abstract

The invention discloses a green synthesis method of methyl-chloride, which comprises the following steps: S1. In the reaction system for preparing methyl-chloride with methyl sulfide and chlorine gas as raw materials, disulfide dichloride can be used to Make the characteristic of methyl sulfide chlorination, by controlling the intake of chlorine, the disulfur dichloride produced in the reaction process continues to react with methyl sulfide to be converted into methyl-chloride and sulfur; S2, until the reaction is completed Finally, add Catalyst A and Catalyst B to the reaction system, so that the sulfur in the system is precipitated as loose crystals, and the crude sulfur and methyl-chloride are separated, and high-purity methyl-chloride is obtained through vacuum distillation. The present invention can not only prepare high-purity methyl-chloride, increase the yield, but also obtain crystalline sulfur with excellent properties, which can be reused; effectively avoiding the production of a large amount of saline wastewater and elastic sulfur waste residue, and also avoiding the pollution caused by waste gas. Pollution, green environmental protection, social benefits and environmental benefits are remarkable.
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Description

technical field

[0001] The invention belongs to the technical field of preparation of pesticide intermediates, and in particular relates to a green synthesis method of methyl-chloride. Background technique

[0002] O, O-dimethylphosphorothioate chloride (referred to as methyl chloride, the same below) is a special intermediate for the synthesis of phosphorothioate pesticides. Methyl-chloride can be used to prepare nearly twenty kinds of high-efficiency, medium-low toxicity organophosphorus pesticides, such as pirimiphos-methyl, chlorpyrifos-methyl, fenitrothion, tolclofos-methyl, etc. Among them, chlorpyrifos-methyl, chlorpyrifos, and pirimiphos-methyl are high-efficiency and low-toxic organophosphate varieties recommended by the Food and Agriculture Organization of the United Nations (FAO). In recent years, the demand for methyl-chloride in the pesticide market has shown an increasing trend year by year.

[0003] At present, the mainstream methyl-chloride synthesis route ...

Claims

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