Patent ID: 7157544
Filing Date: 2007-01-02
Classification: C08G

Abstract:
1. A process for producing an aromatic polycarbonate oligomer which comprises: (a) charging an alkali aqueous solution of a bisphenol compound and a liquid organic solvent to a vessel shape reactor, equipped with a phosgene gas injection nozzle, a reflux condenser for organic solvent, a pipe positioned on an upper portion of said reflux condenser for returning an exhaust gas to said reactor, a stirrer and a cooling jacket (b) then, forming a liquid mixture with stirring (c) then, injecting phosgene into said liquid mixture through said phosgene gas injection nozzle with stirring to react said bisphenol compound with phosgene, (d) removing reaction heat generated during the reaction by cooling, utilizing vaporization latent heat of said liquid organic solvent (e) condensing vaporized organic solvent with said reflux condenser to return to said reactor and returning an exhaust gas comprising non-condensed organic solvent vapor to said reactor via said pipe for returning to said reactor (f) thereby, obtaining a reaction liquid comprising an aromatic polycarbonate oligomer, and (g) passing water through said cooling jacket to cool said reaction liquid comprising an aromatic polycarbonate oligomer.