Patent ID: 6399685
Filing Date: 2002-06-04
Classification: C07F

Abstract:
A process of minimizing or preventing emulsion formation and suppressing hydrolytic product degradation during the purification of an impure bisphenol-A bis(diphenylphosphate) product mixture, which process comprises:a) mixing such impure product with a liquid hydrocarbon solvent comprising at least one aromatic hydrocarbon and at least one paraffinic hydrocarbon in proportions of such impure product to such liquid hydrocarbon solvent in the range of about 25:75 to about 75:25 to form a hydrocarbon solution; b) washing hydrocarbon solution from a) one or more times with an aqueous alkaline washing solution that has a specific gravity that differs from the specific gravity of the hydrocarbon solution by at least about 0.05 gram per cubic centimeter, after each such washing having the washed mixture settle into a purified organic phase and a separate aqueous phase, and separating these phases from each other, each such washing and separating being performed with the phases at a temperature in the range of about 25 to about 100Â° C.; and c) after completing the one or more washings and separations in b), washing the resultant purified organic phase one or more times with water to remove alkaline components from the hydrocarbon solution, after each such washing having the washed mixture settle into a less alkaline purified organic phase and a separate aqueous phase, and separating these phases from each other, each such washing and separating being performed with the phases at a temperature in the range of about 25 to about 100Â° C.