General Electric Company

Ming K Li

Michael R MacLaury

Pure bisphenol-A can be obtained by treating the adduct of the latter and phenol with water in two stages.

Purification of bisphenol-A

Pure bisphenol-A can be obtained by treating the adduct of the latter and phenol with either toluene or a mixture of toluene and water.

Pure bisphenol-A can be obtained by subjecting the adduct of the latter and phenol to spray drying conditions and recovering the bisphenol-A from the released phenol. The use of an inert liquid carrier for the adduct, such as acetone, facilitates the desired separation and purification of the bisphenol-A.

Impure bisphenol-A can be purified by treatment of a phenol adduct of the latter with methylene chloride and then recovering the purified bisphenol-A.

Impure 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene can be purified by heating the latter either with phenol alone or with a mixture of methylene chloride and phenol, allowing the heated mixture to cool until crystallization occurs and removing the above-identified purified dichloroethylene compound.

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Schenectady, NY, United States of America

Ming K Li