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. 03, 2015
Filed:
Mar. 29, 2012
Vanessa Simone Lehr, Mannheim, DE;
Torsten Mattke, Freinsheim, DE;
Carsten Knösche, Niederkirchen, DE;
Heiner Schelling, Kirchheim, DE;
Gerhard Olbert, Dossenheim, DE;
Vanessa Simone Lehr, Mannheim, DE;
Torsten Mattke, Freinsheim, DE;
Carsten Knösche, Niederkirchen, DE;
Heiner Schelling, Kirchheim, DE;
Gerhard Olbert, Dossenheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The present invention relates to gas phase phosgenation of amines for preparation of isocyanates. In the present invention, phosgene is prepared by reacting chlorine with an excess of carbon monoxide in a gas phase. The obtained phosgene-containing reaction mixture is divided into two streams by a thermal and/or a membrane separating process. The first stream is a low-carbon monoxide stream of no more than 1% by weight of carbon monoxide, based on a total weight of the first stream. The second stream is a carbon monoxide-rich stream of more than 10% by weight of carbon monoxide, based on a total weight of the second stream. The first stream is used as the phosgene-containing reactant stream in the gas phase phosgenation of amines to prepare isocyanates. The second stream can be recycled into the phosgene synthesis.