PROCESS FOR PRODUCING HIGH-PURITY BISPHENOL A AND PRODUCTION APPARATUS

摘要

A process for producing bisphenol A containing a free-acid removing step in the following step (D) so as to remove free acid contained in a mother liquid or an isomerized liquid, in a process for producing bisphenol A including: a condensation reaction step (A) reacting phenol with acetone in the presence of an acidic catalyst, a concentration step (B) concentrating the reaction mixture, a crystallization and solid-liquid separation step (C) separating into an adduct of bisphenol A and phenol and a mother liquid by cooling the concentrated reaction mixture, an isomerization step (D) isomerizing the whole of the mother liquid with an isomerization catalyst and circulating the resultant isomerized liquid to the step (A) and/or step (B), as necessary, a recovery step (E) recovering an adduct of bisphenol A and phenol from part of the isomerized liquid treated in the step (D), an adduct decomposition step (F) preparing a bisphenol A melt by removing phenol from the adduct obtained in the step (C), and a prilling step (G) preparing product prill by granulating the bisphenol A melt.