PROCESS FOR PRODUCING BISPHENOL A

摘要

A process for producing bisphenol A which comprises crystallizing an adduct of bisphenol A with phenol from a reaction mixture comprising phenol and acetone, subjecting the resultant slurry to solid-liquid separation, and then removing the phenol from the solid matter, characterized by introducing the bisphenol A/phenol slurry solution containing a bisphenol A/phenol adduct in a crystalline state onto a horizontal endless belt filter at a reduced pressure in a stream of a heated inert gas to form a layer of the crystalline bisphenol A/phenol adduct on the filter, separating the mother liquor from the adduct layer through the filter to regulate the liquid content in the adduct layer to 30 wt.% or lower, and then allowing the adduct layer to separate from the filter by its own weight. By the process, crystals of a bisphenol A/phenol adduct can be stably and continuously separated from the mother liquor and the crystals having a high purity can be efficiently recovered.