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:
Mar. 14, 2017
Filed:
Mar. 15, 2013
Applicant:
Bayer Intellectual Property Gmbh, Monheim, DE;
Inventors:
Rainer Bruns, Leverkusen, DE;
Wolfgang Lorenz, Dormagen, DE;
Andreas Karl Rausch, Kaarst, DE;
Stefan Wershofen, Monchengladbach, DE;
Tim Loddenkemper, Dormagen, DE;
Assignee:
Covestro Deutschland AG, Kaiser-Wilhelm-Allee, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 263/10 (2006.01); C07C 263/20 (2006.01);
U.S. Cl.
CPC ...
C07C 263/10 (2013.01); C07C 263/20 (2013.01); Y02P 20/582 (2015.11);
Abstract
The invention relates to a method for preparing isocyanates by phosgenating the corresponding amines, wherein low-boiling secondary components, excess phosgene, and the co-product hydrogen chloride are separated from the crude liquid isocyanate stream, which is obtained after the phosgenation has occurred, within a maximum of 60 minutes, and wherein the crude liquid isocyanate stream is not exposed to temperatures above 250° C. until said separation.