ULTRAPURE POLYCARBONATES HAVING GOOD NATURAL COLOUR AND HIGH THERMAL STABILITY, APPARATUS AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2015 - IPC C08G64/20 C08G64/40 B29C47/76 

FIELD: chemistry.

SUBSTANCE: invention relates to an apparatus for separating an aromatic polycarbonate from a solution obtained via interphase synthesis, which comprises an extruder with a vent for released gases with at least three degassing zones and a carrier agent dispersion zone, wherein the apparatus further includes a descending tubular evaporator and a foam evaporator and said extruder and evaporators are arranged in the series: descending tubular evaporator - foam evaporator - extruder with a vent for released gases, and the carrier agent dispersion zone is located before each degassing zone. Also described is a method of separating an aromatic polycarbonate from a solution obtained via interphase synthesis.

EFFECT: polycarbonates separated using said method, having extremely low residual content of volatile components and thermal decomposition products, as well as improved optical properties, particularly an optimum yellowness index and high thermal stability.

7 cl, 4 dwg, 6 ex