Patent ID: 6710211
Filing Date: 2004-03-23
Classification: C07C

Abstract:
A process for the production of p,p-bisphenol A (BPA) comprising the steps ofa) reacting acetone and phenol in the presence of a cross-linked sulfonated polystyrene resin, b) crystallizing the reactants in a crystallization unit wherein, the crystallization is layer crystallization, the crystallization is carried out continuously or batchwise, and a mixture containing p,p-BPA, phenol and secondary components is obtained, c) purifying the mixture by distillation or desorption, wherein p,p-BPA is obtained, d) optionally performing a second purification of the p,p-BPA by distillation or crystallization, e) circulating the mixture through a rearrangement reactor, wherein the reactor contains an acidic ion-exchange material, and f) distilling water, acetone or phenol off the mixture.