Invention Grant
- Patent Title: Process for preparing isocyanates
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Application No.: US14546587Application Date: 2014-11-18
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Publication No.: US09302983B2Publication Date: 2016-04-05
- Inventor: Vanessa Simone Lehr , Torsten Mattke , Carsten Knoesche , Heiner Schelling , Gerhard Olbert
- Applicant: BASF SE
- Applicant Address: DE Ludwigshafen
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE Ludwigshafen
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Main IPC: C07C263/10
- IPC: C07C263/10 ; C01B7/04

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.
Public/Granted literature
- US20150080600A1 PROCESS FOR PREPARING ISOCYANATES Public/Granted day:2015-03-19
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