METHOD AND DEVICE FOR PRODUCING POLYCARBONATE Russian patent published in 2017 - IPC C08G64/30 C08G64/40 

FIELD: chemistry.

SUBSTANCE: method for producing polycarbonate is described, comprising at least the following stages: a) transesterification of one or more bisphenols with one or more diaryl carbonates in at least one transesterification reactor with continuous removal of cleaved hydroxyaryl reaction product; b) pre-polycondensation of the transesterification reaction product in at least one pre-polycondensation reactor with continuous removal of hydroxyaryl reaction product; c) polycondensation of the pre-polycondensation reaction product in at least one polycondensation reactor, wherein the removal of the hydroxyaryl reaction product during the transesterification reaction and removal of the hydroxyaryl reaction product during the pre-polycondensation reaction are carried out in the common column where diaryl carbonate transported together with said products is separated from the removed hydroxyaryl reaction product. The device for producing polycarbonate is described as well, having: a) at least one transesterification reactor to obtain a reaction mixture which comprises at least one bisphenol and at least one diaryl carbonate, and to obtain a transesterified intermediate product; b) at least one pre-polycondensation reactor to form an intermediate pre-polycondensation product from the interesterified intermediate product; c) at least one polycondensation reactor (finisher) to obtain polycarbonate from the intermediate pre-polycondensation product in which at least one transesterification reactor and one polycondensation reactor have a means for removal of the hydroxyaryl reaction product split off during the transesterification reaction and the pre-polycondensation reaction, said means representing one common column. The polycarbonate produced by means of the above method and its application are described as well.

EFFECT: obtaining high-quality polycarbonate with using closed material cycles with improved economic efficiency.

21 cl, 6 dwg