Preparing (co)polycarbonate or diaryl carbonate, useful in e.g. sunglasses, comprises converting di-, mono-phenol and phosgene to chloroformic acid aryl ester, oligo- or diaryl-carbonate, and reacting the product under alkaline solution

摘要

Continuously preparing polycarbonate or copolycarbonate and/or diaryl carbonate comprises (a) continuously producing a mixture of an organic phase containing a solvent suitable for the polycarbonate and/or diaryl carbonate, and aqueous phase containing a solvent suitable for diphenol, monophenol, water and alkaline solution; (b) converting the diphenol, monophenol and phosgene to oligocarbonate and/or chloroformic acid aryl ester and/or diaryl carbonate; and (c) reacting an oligocarbonate, chloroformic acid aryl ester and/or diaryl carbonate under the addition of alkaline solution. Continuous preparation of polycarbonate or copolycarbonate and/or diaryl carbonate after the interfacial phase process of at least a diphenol and/or monophenol, phosgene and at least a catalyst optionally in the presence of at least a chain breaker and/or brancher, comprises (a) continuously producing a mixture of an organic and aqueous phase, where the organic phase contains at least a solvent suitable for the polycarbonate and/or diaryl carbonate and the phosgene and the aqueous phase contains the diphenol, monophenol, water and alkaline solution; (b) converting the diphenol, monophenol and phosgene to oligocarbonate and/or chloroformic acid aryl ester and/or diaryl carbonate; and (c) subsequently reacting an oligocarbonate, chloroformic acid aryl ester and/or diaryl carbonate in at least a reactor under the addition of further alkaline solution, optionally chain breaker and optionally at least a further catalyst, where: the steps (a) and (b) takes place in one or more pump(s), which have at least an inlet for the organic and aqueous phase and optionally further inlet for catalyst, chain breaker, brancher and/or alkali solution, respectively, and at least an outlet for the oligocarbon containing and/or chloroformic acid aryl ester-diaryl carbonate mixture; and the pump has thermostatic temperature and operates in stator-rotor principle.