Process for purifying phenol-containing bisphenol A

摘要

The process of the present invention comprises a first step in which crude molten bisphenol A containing phenol is supplied to a flash evaporator and separated into a gaseous phase comprising phenol and a liquid phase comprising bisphenol A and residual phenol, and a second step in which the liquid phase obtained in the first step is heated by a thin film evaporator and separated into a gaseous phase comprising phenol and a liquid phase comprising concentrated bisphenol A and residual phenol, part of the liquid phase obtained in the second step being circulated to the first step and supplied to the flash evaporator along with crude molten bisphenol A. It is possible with this process to obtain high-quality bisphenol A stably from phenol-containing bisphenol A.