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:
Apr. 28, 2009
Filed:
Dec. 13, 2003
Martin Sohn, Mannheim, DE;
Eckhard Stroefer, Mannheim, DE;
Filip Nevejans, St.Gillis-Waas, BE;
Ulrich Penzel, Tettau, DE;
Hans-juergen Pallasch, Kallstadt, DE;
Peter Van Den Abeel, Brasschaat, BE;
Filip Deberdt, Muizen, BE;
Jan D. Jacobs, Baton Rouge, LA (US);
Wolfgang Mackenroth, Bad Duerkheim, DE;
Martin Sohn, Mannheim, DE;
Eckhard Stroefer, Mannheim, DE;
Filip Nevejans, St.Gillis-Waas, BE;
Ulrich Penzel, Tettau, DE;
Hans-Juergen Pallasch, Kallstadt, DE;
Peter Van Den Abeel, Brasschaat, BE;
Filip Deberdt, Muizen, BE;
Jan D. Jacobs, Baton Rouge, LA (US);
Wolfgang Mackenroth, Bad Duerkheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably two-stage, distillation process in which the solvent is separated off at a pressure of 0.1-15 bar in a first apparatus and at 1-900 mbar in a second apparatus or further apparatuses, with the heat of condensation of the solvent vapor from the first apparatus being used for partial or complete vaporization of solvent in the second apparatus.