General Electric Company

Viney P Aneja

Subhas K Sikdar

John P Skilbeck

A method and apparatus for devolatilizing high viscosity polymer solutions are provided wherein high viscosity polymer solutions are heated along a short zone of indirect heat exchange. The residence time within the zone of indirect heat exchange ranges from approximately 5 seconds to 120 seconds.

Method for devolatilizing polymer solutions

Bisphenol A is commonly purified by a method which includes formation of an adduct thereof with phenol from a liquid mixture to which water has been added. This method is improved by the simultaneous addition of an organic liquid in an amount up to about 15% by weight of the mixture. The preferred organic liquids are acetone and toluene.

Method for purification of bisphenol A

A method for simultaneously extracting and recovering 2,2-bis(4-hydroxy phenyl) propane and phenol from aqueous effluent streams by liquid-liquid extraction using toluene.

Azeotropic recovery of BPA and phenol from aqueous effluent streams

A method for simultaneously extracting and recovering 2,2-bis(4-hydroxyphenyl) propane and phenol from aqueous effluent streams by liquid-liquid extraction using methyl isobutyl ketone.

Recovery of BPA and phenol from aqueous effluent streams

A method for a purifying aqueous effluent streams containing BPA and phenol using liquid-liquid extraction with methyl isobutyl ketone.

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Schenectady, NY, United States of America

Viney P Aneja