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:
Jun. 14, 2016
Filed:
Dec. 14, 2009
Klaus Biskup, Buchholz, DE;
Rainer Bruns, Leverkusen, DE;
Wolfgang Lorenz, Dormagen, DE;
Lars Padeken, Itzehoe, DE;
Bernd Pennemann, Gladbach, DE;
Fritz Pohl, Brunsbuttel, DE;
Andreas Rausch, Neuss, DE;
Friedhelm Steffens, Leverkusen, DE;
Klaus Biskup, Buchholz, DE;
Rainer Bruns, Leverkusen, DE;
Wolfgang Lorenz, Dormagen, DE;
Lars Padeken, Itzehoe, DE;
Bernd Pennemann, Gladbach, DE;
Fritz Pohl, Brunsbuttel, DE;
Andreas Rausch, Neuss, DE;
Friedhelm Steffens, Leverkusen, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
Meta-toluene-diisocyanate is produced by reacting meta-toluenediamine with phosgene in the gas phase. The meta-toluenediamine to be vaporized for use in this phosgenation process must contain less than 0.5 wt. % of toluenediamine residue, a total of less than 0.2 wt. % of ammonia and cycloaliphatic amines, and less than 20 ppm of heavy metals. At least 0.1 wt. % of the liquid meta-toluenediamine being to be vaporized must not be vaporized. This non-vaporized content of the meta-toluenediamine must not be fed to the phosgenation reactor.