METHOD FOR RECOVERING A DIHYDRIC PHENOL FROM A SCRAP POLYESTER

摘要

08CL-06627 METHOD FOR RECOVERING A DIHYDRIC PHENOL FROM A SCRAP POLYESTER A method for recovering a dihydric phenol from scrap polyester which comprises: a. contacting an aromatic polyester selected from the group consisting of polycarbonate, copolyestercarbonate and a polyarylate with (1) an aqueous ammoniacal solution of sufficient strength to sever the ester bonds of the aromatic polyester and (2) an alkylchloride in which the polyester is at least partially soluble, b. forming two mobile liquid phases, the top phase being aqueous and the bottom phase being the alkyl chloride and containing ammonium dihydric phenolate; c. separating the top phase from the bottom phase; d. recovering from the bottom phase the dihydric phenol.