METHOD OF RECOVERING PHENOL IN BISPHENOL A PRODUCTION

摘要

In a process for bisphenol A production which comprises cleaning with phenol a strongly acid ion-exchange resin partially modified with a sulfur-amine compound, subsequently condensing phenol with acetone in the presence of the cleaned ion-exchange resin as a catalyst, distilling the resultant liquid reaction mixture under vacuum to separate it into a top fraction and a bottom fraction containing bisphenol A, concentrating the bottom fraction and crystallizing the concentrate, and recovering the bisphenol A from the crystallization product, the phenol solution resulting from the cleaning is distilled to recover the phenol. Thus, the phenol can be recovered, without adversely influencing the quality of bisphenol A, from the phenol solution resulting from the cleaning of the strongly acid ion-exchange resin.