Polycarbonate During CD Alcoholysis for Preparation of Bisphenol A

In order to recycle the polycarbonate during CD,Bisphenol A( BPA) was prepared by methan-olysis under atmospheric pressure using toluene as solvent,NaOH as catalyst and Na2 S as protective agent. All factors affecting the reaction were studied. The result showed that all polycarbonate during CD could be depolymerized under the optimum conditions of reaction time 40 min,reaction temperature 60 ℃,stirring at uniform speed,V( methanol) ∶ V( toluene) = 1∶ 3,m( PC /g) ∶ V( organic solution/mL) =1∶3. 15,m( Na2S) ∶ m( PC) = 1 ∶ 300,( NaOH) ∶ m( PC) = 1 ∶ 20,and the yield of BPA was over88%.