Production method of O, O-dialkyl thiophosphoryl chloride

Abstract

The invention discloses a manufacturing method of O, O-dialkyl thiophosphoryl chloride; the manufacturing method comprises the steps that phosphorus trichloride, alcohol, sulfur and the like are taken as raw materials, wherein, the phosphorus trichloride reacts with alcohol in a trialkyl synthesis kettle to produce phosphorous acid trialkyl ester; then, the phosphorous acid trialkyl ester reacts with the phosphorus trichloride in a chlorinator to produce O, O-dialkyl phosphorus chloride; and the O, O-dialkyl phosphorus chloride reacts with sulfur in a vulcanizing apparatus to produce the crude products of O, O-dialkyl thiophosphoryl chloride which then is processed to obtained the refined products of the O, O-dialkyl thiophosphoryl chloride. The overall yield of the manufacturing method can be up to 94 percent, the content of the O, O-dialkyl thiophosphoryl chloride can reach 99 percent, and the manufacturing method is characterized by safe production, low energy consumption and no pollution.

Description

Technical field: [0001] The present invention relates to the chemical production of O,O-dialkylphosphorylthiochlorides, such as O,O-dimethylphosphorylchloride and O,O-diethylphosphorylchloride. Background technique: [0002] (1) At present, the production of O, O-dimethylphosphoryl thiochloride in China adopts the reaction of phosphorus trichloride and sulfur to generate phosphorus trichloride, and reacts with excess methanol to generate O-methylphosphoryl thiochloride (referred to as dichloride); dichloride reacts with excess methanol in the presence of a base to generate O, O-dimethylphosphoryl thiochloride (abbreviated as monochlorine). [0003] During production, sulfur reacts with phosphorus trichloride, and its yield and content can reach 97%. [0004] When phosphorus trichloride reacts with methanol to generate dichloride, methanol must be in excess, and the molar ratio is 1:5. The reaction temperature must be maintained at about 0°C, and the reaction will generate ...

AI Technical Summary

Problems solved by technology

However, it can be seen from the above reaction formula that a large amount of HCl and SO are produced by the reaction. 2 , S and NaCl, which cause great difficulties for recycling and post-processing, and make the surrounding residents unbearable due to too much pollution to the environment

[0031] Due to the many by-products, the yield of the product to phosphorus pentasulfide is only 78%.

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