Patent ID: 6960697
Filing Date: 2005-11-01
Classification: C07C

Abstract:
1. A method for producing bisphenol-A by crystallization from a product solution comprising the following steps: forming a product solution comprised of phenol, bisphenol-A, isomers of bisphenol-A, un-reacted reactants, and a solvent comprised of two or more solvent components, selectively controlling the amount of said solvent in the product solution to manipulate a phase behavior of the product solution such that a maximum amount of substantially pure crystalline bisphenol-A will be crystallized from said product solution before a solid adduct of bisphenol A and phenol appears, where the total weight percent of said solvents prior to crystallization is at or below about 40%, and separating substantially pure bisphenol-A, where the final separation of substantially pure bisphenol-A is achieved by direct crystallization.