Patent ID: 9410015
Filing Date: 2016-08-09
CPC Classification: B01J,C08G

Claim Text:
1. A method for production of a polycarbonate, comprising at least the following steps: a) transesterification of one or more bisphenols with one or more diaryl carbonates in at least one transesterification reactor, with continuous removal of the hydroxyl-aryl reaction product which is released, b) pre-polycondensation of the reaction product of the transesterification in at least one pre-polycondensation reactor, with continuous removal of the hydroxyl-aryl reaction product, c) polycondensation of the reaction product of the pre-polycondensation in at least one polycondensation reactor, wherein the removal of the aryl reaction product during the transesterification reaction, and the removal of the hydroxyl-aryl reaction product during the pre-polycondensation reaction, is performed by a shared column, wherein diaryl carbonate carried along with the same is separated from the removed hydroxyl-aryl reaction product.