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. 10, 2009
Filed:
Dec. 11, 2007
Applicants:
Fritz Pohl, Brunsbüttel, DE;
Klaus Biskup, Leverkusen, DE;
Rainer Bruns, Leverkusen, DE;
Friedhelm Steffens, Leverkusen, DE;
Herbert Stutz, Dormagen, DE;
Inventors:
Fritz Pohl, Brunsbüttel, DE;
Klaus Biskup, Leverkusen, DE;
Rainer Bruns, Leverkusen, DE;
Friedhelm Steffens, Leverkusen, DE;
Herbert Stutz, Dormagen, DE;
Assignee:
Bayer MaterialScience AG, Leverkusen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C 263/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Isocyanates are produced by reaction of primary amines with phosgene in the gas phase. In this process, the reaction is terminated by guiding the reaction mixture from the reaction chamber through a cooling stretch into which liquids are injected. Direct cooling takes place in the cooling stretch in one stage in two or more cooling zones connected in series.