The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2015
Filed:
Mar. 25, 2011
Applicants:
Pieter Ooms, Krefeld, DE;
Andreas Bulan, Langenfeld, DE;
Inventors:
Pieter Ooms, Krefeld, DE;
Andreas Bulan, Langenfeld, DE;
Assignee:
Bayer MaterialScience AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 68/02 (2006.01); C08G 64/30 (2006.01); C01B 7/04 (2006.01); C01B 7/07 (2006.01);
U.S. Cl.
CPC ...
C08G 64/307 (2013.01); C01B 7/04 (2013.01); C01B 7/0731 (2013.01); C07C 68/02 (2013.01);
Abstract
The present invention relates to a process for the continuous preparation of diaryl carbonates from phosgene and at least one monohydroxy compound (monophenol) in the presence of catalysts, and also the use thereof for preparing polycarbonates. The hydrogen chloride formed in the reaction is converted by thermal oxidation into chlorine, with the chlorine being recirculated to the preparation of phosgene. In particular, the process comprises utilization of the hydrogen chloride formed for the process for preparing diphenyl carbonate (DPC process).