Production process of O, O-dialkyl thiophosphoryl chloride

A technology for the production of alkyl thiophosphoryl and chlorine, which is applied in chemical instruments and methods, organic chemistry, compounds of Group 5/15 elements of the periodic table, etc. and other problems, to achieve the effect of low cooling consumption, low energy consumption and high steam consumption

Active Publication Date: 2010-09-15
荆州三才堂化工科技有限公司
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Problems solved by technology

[0014] In addition, methanol is excessive in the production of dichloride and monochloride. If methanol is not recovered, it will cause great pollution to the environment, and cause great economic losses. Therefore, the process must have a strong The methanol recovery system consumes a large amount of steam per ton of chloride
[0015] (2) The production of O, O-diethylphosphoryl thiochloride can also be obtained by the reaction of phosphorus trichloride and absolute ethanol in the presence of alkali, but at present there is no domestic enterprise using this method to produce
[0023] The purity of the

Method used

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  • Production process of O, O-dialkyl thiophosphoryl chloride

Examples

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example 1

[0048] Example 1: The raw materials used for the synthesis of this product are trimethyl phosphite, phosphorus pentasulfide, methanol, chlorine, and phosphorus trichloride. Trimethyl phosphite and phosphorus trichloride are reacted in the reactor to generate O, O-dimethyl phosphorus monochloride is added to the intermediate dichlorodisulfide after the reaction of phosphorus pentasulfide and methanol and chlorination, that is, O , O-dimethylphosphoryl thiochloride.

[0049]Phosphorus trichloride input amount 151Kg in the present embodiment, trimethyl phosphite 272Kg, phosphorus pentasulfide 364Kg, methyl alcohol 211Kg, chlorine 233Kg; The product O of producing, the weight of O-dimethylphosphoryl thiochloride is 1000Kg. The total yield of phosphorus trichloride is 94%, and its content is 99.1%.

example 2

[0050] Example 2: The raw materials used for the synthesis of this product are phosphorus trichloride, triethyl phosphite, dehydrated alcohol, phosphorus pentasulfide, and chlorine. The product O produced by the reaction of triethyl phosphite and phosphorus trichloride, O-diethyl phosphorus monochloride is added to the intermediate dichlorodisulfide after the reaction of phosphorus pentasulfide and absolute ethanol and chlorination, to obtain O, O-diethylthiophosphoryl chloride.

[0051] Phosphorus trichloride input amount 128Kg among the present example, triethyl phosphite 308Kg, phosphorus pentasulfide 309Kg, dehydrated alcohol 257Kg, chlorine 198Kg; The product O of producing, the weight of O-diethylphosphoryl thiochloride is 1000Kg. The total yield of phosphorus trichloride is 94%, the total yield of phosphorus pentasulfide is 94%, and its content is 99.1%.

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Abstract

The invention relates to a production process of O, O-dialkyl thiophosphoryl chloride, which improves the production process of the O, O-dialkyl thiophosphoryl chloride produced by a phosphorus pentasulfide method. An O, O-dialkyl thiophosphoryl chloride product is synthesized by adding a by-product obtained by reacting phosphorus pentasulfide with alkanol and introducing chlorine to O, O-dialkyl phosphorus chloride obtained by reacting trialkyl phosphite with phosphorus trichloride. The invention can achieve the total yield of the trialkyl phosphite by 94 percent and the total yield of the phosphorus pentasulfide more than 95 percent and has safe production, little energy consumption and pollution without generating sulphur residues.

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. technical background [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 the reaction of phosphorus trichloride and excess methanol generates O-methylphosphorothioate Acyl dichloride (referred to as dichloride), dichloride reacts with excess methanol in the presence of a base to generate O, O-dimethylphosphoryl thiochloride (abbreviated as monochloride). [0003] During production, sulfur reacts with phosphorus trichloride to generate phosphorus trichloride, and its yield and content can reach 97%. When phosphorus trichloride reacts with methanol to generate dichloride, methanol must be in large excess, and its molar ratio is three Chlorathion:methanol=...

Claims

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Application Information

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IPC IPC(8): C07F9/20
Inventor 罗方明刘国罗朝林
Owner 荆州三才堂化工科技有限公司
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