Continuous industrial production method of high-purity bisphenol a-bis(diphenyl phosphate)

A continuous industrial production method of high-purity bisphenol A-bis(diphenyl phosphate), comprising the following processes:

• 1) dividing bisphenol A into two parts, firstly premixing a part of the bisphenol A with phosphorus oxychloride and a Lewis acid catalyst to form a reaction liquid;
• adding the reaction liquid into a continuous multistage crosslinked reactor in a continuous feeding manner, and taking a reaction by controlling a reaction temperature at 80° C. to 120° C. and a reaction pressure at −0.015 to −0.02 MPa;
• after the reaction is completed, removing excessive phosphorus oxychloride by using a film evaporator through reduced pressure distillation, adding an organic base acid binding agent and the rest of the bisphenol A into a distillation remaining liquid, and taking a reaction for 1.5 to 3 h at a temperature of 115° C. to 120° C. to obtain an intermediate product reaction liquid;
• 2) premixing the intermediate product reaction liquid obtained in the step 1) with a phenol initial raw material, then, adding the mixture into a multistage esterification reactor in a continuous feeding manner, and taking an esterification reaction by controlling a reaction temperature at 90 to 150° C. and a reaction pressure at −0.015 to 0.02 MPa;
• continuously supplying consumed phenol in the multistage esterification reaction process so that a reaction progress is accelerated, obtaining a bisphenol A-bis(diphenyl phosphate) crude product after the reaction is completed, and dissolving the crude product into an organic solvent to form a crude product solution;
• and
• 3) sequentially performing continuous acid washing, continuous alkali washing and continuous water washing on the crude product solution obtained in the step 2), and performing continuous solvent recovery and filtration to obtain a bisphenol A-bis(diphenyl phosphate) finished product.