Isolation and purification of bisphenol-phenol adducts, e.g. for production of Bisphenol A, involves separation from mother liquor in a rotary vacuum filter, washing the crystals and removing washings by suction

摘要

A method for the isolation and purification of bis-(4-hydroxyaryl)-alkane/phenol adducts from the acid-catalysed reaction of ketones with phenols involves separating the crystallized adduct from the mother liquor by continuous filtration in a rotary vacuum filter with several filter cells, washing the crystals and removing the washings by suction. An Independent claim is also included for 2,2-bis-(4-hydroxyphenyl)-propane (BPA) obtained by this method.