its preparation method is to put p-chlorophenol and toluene into a reaction kettle for stirring and dissolution, add a certain amount of thion trichloride to the reaction kettle under stirring, add a certain amount of catalyst solution dropwise below 20 ℃ for reaction, add a certain amount of water at the end of the reaction, stir evenly, and then stand and delaminate to obtain the product.
In the early 2090 s, a domestic unit has improved this process, using toluene as a solvent, mixing phosphorus trichloride and p-chlorophenol, adding the phase transfer catalyst benzyl triethylammonium chloride aqueous solution, stirring at room temperature Drop the alkali solution to get O,O-bis (p-chlorophenyl) thiophosphoryl chloride. This method eliminates the anhydrous conditions for the preparation of intermediates, does not use any other separation steps, and eliminates the need for expensive triethylamine as an acid binding agent, greatly reducing the cost of raw materials and increasing the yield.