Patent ID: 7863403

Claim:
A process for continuously preparing a polycarbonate or a copolycarbonate or a diaryl carbonate by the phase boundary process from a diphenol or a monophenol, phosgene and a catalyst, optionally in the presence of at least one chain terminator and/or branching agent, comprising (a) continuously mixing an organic phase and an aqueous phase, said organic phase comprising a solvent suitable for said polycarbonate or copolycarbonate or diaryl carbonate and phosgene and said aqueous phase comprising said a diphenol or a monophenol, water, and alkali solution; (b) reacting said diphenol or monophenol and said phosgene in the presence of a catalyst to give a polycarbonate or a copolycarbonate or an aryl chloroformate or a diaryl carbonate or a mixture of an aryl chloroformate and a diaryl carbonate; and (c) reacting said polycarbonate or copolycarbonate or aryl chloroformate or diaryl carbonate or mixture of aryl chloroformate and diaryl carbonate in a reactor with additional alkali solution and optionally a chain terminator and optionally a further catalyst; wherein said continuous mixing in (a) and said reaction in (b) are effected in a pump, wherein said pump operates according to the stator-rotor principle and comprises a static housing P, a rotating internal apparatus R comprising blades S, and a circulation channel K; is thermostatable to a temperature of from âˆ’5Â° C. to 100Â° C.; and comprises an entrance for said organic phase and an entrance for said aqueous phase and optionally comprises entrances for a catalyst, a chain terminator, a branching agent, and/or additional alkali solution and at least one exit for said polycarbonate or copolycarbonate or aryl chloroformate or diaryl carbonate or mixture of aryl chloroformate and diaryl carbonate.