CIRCULATION FLOW DEHYDRATION IN BISPHENOL A OBTAINMENT

摘要

FIELD: chemistry. ^ SUBSTANCE: method involves the following stages: a) reaction of phenol and acetone in the presence of acid catalyst to obtain reaction mix containing bisphenol A. Further, b) water is removed from reaction mix by distillation, with distillation column operated at 100C to 150C in the bottom column part and at 20C to 80C in the top column part, 50 mbar to 300 mbar absolute pressure in the top column part and 100 mbar to 300 mbar absolute pressure in the bottom column part. Bisphenol A adduct with phenol is removed from reaction mix before distillation at b) stage by crystallisation and filtration. ^ EFFECT: maximum retention of unreacted residual acetone in reaction solution. ^ 9 cl, 1 ex