Separation of bisphenol-a from the alkaline phase generated...

Details Separation of bisphenol-a from the alkaline phase generated... Separation of bisphenol-a from the alkaline phase generated...

C - Chemistry, Metallurgy

07

C

402/178, 260/623

C07C 68/02 (2006.01) C08G 64/24 (2006.01) C08G 64/40 (2006.01)

Patent

CA 1049565

ABSTRACT OF THE DISCLOSURE This invention relates to polycarbonates and more particularly to separating unreacted bisphenol-A from the alkaline phase generated in the production of polycarbonates, comprising contacting the alkaline phase with phosgene in a secondary reaction stream in the presence of an organic solvent to convert the unreacted bisphenol-A to a low mole- cular weight polymer having chlorocarbonate end groups, separating the solvent solution of the low molecular weight polymer from the aqueous alkaline phase and, preferably, returning said solvent solution to the main reaction stream.

242479

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