PRETREATMENT OF CATALYST FOR PRODUCING BISPHENOL A AND PRODUCTION OF BISPHENOL A HAVING STABLE HUE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing bisphenol A which has a stable hue at high temperature and is not discolored, and to provide a method for preliminarily treating a sulfonic acid type ion exchange resin used as a catalyst for the above method. ;SOLUTION: This method for preliminarily treating a catalyst for producing bisphenol A comprises charging a sulfonic acid type ion exchange resin as the catalyst into a reactor, washing the sulfonic acid type ion exchange resin with water until the pH of the washing drain becomes 6 or larger, and subsequently washing the sulfonic acid type ion exchange resin with phenol until the released sulfonic acid concentration (converted into paratoluenesulfonic acid) in the washing drain becomes 2 wt.ppm or smaller. The method for producing the bisphenol A having a stable hue comprises reacting phenol with acetone in the coexistence of the pretreated catalyst for producing the bisphenol A and an alkyl mercaptan as an auxiliary catalyst.;COPYRIGHT: (C)2000,JPO