| US 7,592,479 B2 | ||
| Reprocessing of reaction material discharged from phosgenation reactors | ||
| Eckhard Stroefer, Mannheim (Germany); Stephan Scholl, Braunschweig (Germany); Martin Sohn, Mannheim (Germany); Andreas Woelfert, Bad Rappenau (Germany); Hans-Juergen Pallasch, Ludwigshafen (Germany); and Jan Peter Bredehoeft, Boehl-Iggelheim (Germany) | ||
| Assigned to BASF Aktiengesellschaft, Ludwigshafen (Germany) | ||
| Appl. No. 10/529,182 PCT Filed Sep. 18, 2003, PCT No. PCT/EP03/10381 § 371(c)(1), (2), (4) Date Mar. 24, 2005, PCT Pub. No. WO2004/031132, PCT Pub. Date Apr. 15, 2004. |
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| Claims priority of application No. 102 45 584 (DE), filed on Sep. 27, 2002. | ||
| Prior Publication US 2006/0052629 A1, Mar. 09, 2006 | ||
| Int. Cl. C07C 263/101 (2006.01) | ||
| U.S. Cl. 560—352 [560/330] | 10 Claims |
| 1. A process for preparing an isocyanate, comprising:
reacting a primary amine with phosgene in a reactor; and
working up a reaction discharge from the reactor in a film evaporator;
wherein the reaction discharge from the reactor comprises a suspension including the isocyanate as a liquid and a carbamyl
chloride as a solid.
|