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. 24, 1998
Filed:
Mar. 06, 1997
Applicant:
Inventors:
Jurgen Dahmer, Koln, DE;
Dieter Schleenstein, Odenthal, DE;
Heinrich Steude, Leverkusen, DE;
Oswald Wilmes, Koln, DE;
Christian Rasp, Gladbach, DE;
Georg Ronge, Dusseldorf, DE;
Klaus Nachtkamp, Dusseldorf, DE;
Wilfried Litz, Koln, DE;
Stephan Kabelac, Wunstdorf, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560345 ;
Abstract
This present invention relates to a process for thermally cracking carbamic acid esters into the corresponding isocyanate and hydroxyl compounds in the liquid phase, wherein the reaction proceeds as a reactive rectification in the stripping zone of a column and in an inert, high-boiling solvent, which acts as a buffer to keep the reaction away from the evaporator region of the column.