| 摘要 |
PURPOSE:To smoothly and efficiently isomerize isomers other than the objective phenols and convert the isomers into the objective bisphenols by using a partially modified strongly acidic ion exchange resin as a catalyst. CONSTITUTION:A carbonyl compound is condensed with phenols using a strongly acidic ion exchange resin in which an acidic functional group is modified with mercapto-thiazolines expressed by the formula (R<1> to R<5> are H, OH, NH2, N03, carbonyl, carboxyl, acetyl, sulfone, alkyl, cycloalkyl, allyl or mercapto, with the proviso that at least one thereof is mercapto), e.g. 2-mercapto-thiazoline as a catalyst to produce bisphenols. In the process, isomers of bisphenols formed as a by-product other than the objective bisphenols are brought into contact with the catalyst and converted into the objective bisphenols. A sulfonic acid type styrene-divinylbenzene-based cation exchange resin is preferred as the strongly acidic ion exchange resin. The modification ratio is preferably <=70%, especially preferably 10-25%. |
