Process for continuous production of polycarbonates and a reactor therefor

US6630563B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Uwe Hucks · Alpen, DE
• Thomas König · Nuremberg, DE
• Silke Kratschmer · Krefeld, DE
• Eike Schulz Van Endert · Berlin, DE
• Klaus Schroder · East Syracuse, US
• Hans-Peter Hoffmann · Dachau, DE

Key dates

• Filing date: Apr 22, 2002
• Grant date: Oct 7, 2003
• Expiry date: Apr 22, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31504
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for producing polycarbonate is disclosed. The process entails obtaining an oligocarbonate produced by transesterification of diaryl carbonate with dihydroxyaryl compound in the presence of catalysts and introducing the oliogocarbonate into a reactor that enables continuous formation of free films at a rate higher than 10. The reactor including a horizontal cylinder equipped with a heating jacket, at least one vapor outlet, a feed nozzle an outlet nozzle, a rotatable cylindrical basket having a cylindrical perforated wall and annular discs positioned at intervals around the periphery of said basket and along the length thereof, and means for rotating said basket, the interior of said basket including no central shaft, the diameter of the cylindrical basket corresponding to about ⅔ of the diameter of the horizontal cylinder, and said discs being formed of perforated sheet metal.