Green synthesis technology of O,O-diethyl thiophosphoryl chloride

Abstract

The invention provides a green synthesis technology of O,O-diethyl thiophosphoryl chloride and relates to the field of chemical synthesis. The green synthesis technology comprises the following steps:taking O,O-diethyl dithiophosphate to react with chlorine gas at low temperature, so as to obtain a crude product of the O,O-diethyl thiophosphoryl chloride; then transferring the crude product to react at high temperature; enabling the residual O,O-diethyl dithiophosphate to further completely react with the chlorine gas. Meanwhile, in a high-temperature reaction process, a polymeric compound isprevented from being generated when a compound catalyst is used and sulfur monochloride impurities are completely removed through reaction, so that a byproduct sulfur has a crystalline state and a product more easily separated and purified. Moreover, HCl and sulfur-containing odorous gas are pumped away through applying negative pressure and the tail gas is absorbed to prevent air pollution. In awhole reaction process, technological water does not need to be added, so that wastewater is not generated and the treatment cost of sulfur-containing and phosphorus-containing wastewater is reduced.The technology has the advantages of simplicity in operation, easiness for obtaining raw materials, moderate reaction conditions, small pollution and environment friendliness.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a green synthesis process of O, O-diethylphosphorylthiochloride. Background technique [0002] O, O-diethylthiophosphoryl chloride is an important pesticide and pharmaceutical intermediate, which can be used to synthesize organophosphorus insecticides parathion, phoxim, diazinon, quinoxafos, pyridazine sulfur Phosphorus, triazophos, pyrimidinoxon, phosphinophos, chlorpyrifos, demeton and synergist synergistic phosphorus, etc., can also be used as synthetic raw materials for lubricating oil additives and other sulfur-containing organophosphorus compounds. At present, there are many domestic manufacturers with large annual output. [0003] The production method of O,O-diethylphosphorothioate is based on different raw materials, and there are two methods: phosphorus trichloride method and phosphorus pentasulfide method. The production cost of phosphorus trichloride is high, the s...

AI Technical Summary

Problems solved by technology

The phosphorus trichloride method has high production costs, many side reactions, and serious environmental pollution. It is basically not used in production. The phosphorus pentasulfide method is currently a common production method.

The impurity in the crude product of O, O-diethylthiophosphoryl chloride produced by phosphorus pentasulfide method is mainly disulfur dichloride (content is about 25%). Alkali metal reducing salt method, ammonium bisulfite method and sodium sulfite method, but a large amount of sulfur-containing and foul-smelling wastewater will be generated during the process of production, which seriously affects the surrounding environment