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. 26, 2019
Filed:
Jul. 12, 2016
Applicant:
Covestro Deutschland Ag, Leverkusen, DE;
Inventors:
Friedhelm Steffens, Leverkusen, DE;
Bastian Mahr, Bergisch Gladbach, DE;
Assignee:
COVESTRO DEUTSCHLAND AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 263/10 (2006.01); C07C 263/20 (2006.01); B01D 3/16 (2006.01); B01D 3/42 (2006.01);
U.S. Cl.
CPC ...
C07C 263/10 (2013.01); B01D 3/16 (2013.01); B01D 3/42 (2013.01); C07C 263/20 (2013.01);
Abstract
A method for producing isocyanates by reacting primary amines with phosgene in a stoichiometric excess in the gas phase, wherein the excess phosgene is subsequently recovered and recirculated back into the reaction. particular a method for the feedback-controlled recirculation of the recovered phosgene, particularly when the phosgene stream that should be recovered is distributed between multiple gas-phase reactors operated in parallel.