ACETOPHENONE REMOVED FROM PHENOL PURIFICATION RESIDUES

摘要

A process for separating phenol obtained by the decomposition of cumene hydroperoxide from high boiling impurities, includes the following steps:PPa) feeding phenol rectification bottoms comprising phenol, acetophenone, cumylphenol, alpha-methylstyrene dimers and high boiler residues to a first phenol freeing distillation column A; PPb) feeding concentrated bottoms with substantially reduced phenol content from column A to a second residue concentration distillation column B;PPc) withdrawing a stream rich in compounds boiling between phenol and residue, particularly cumylphenol, from said column B from a point below the feed and returning at least a portion of said stream to said column A at a point above the feed; PPd) recovering overheads from column A comprising at least 95 weight percent phenol; andPPe) recovering acetophenone- rich overheads from column B comprising at least 70 weight percent acetophenone.