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:
Sep. 08, 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 the partial or complete separation of a mixture comprising hydrogen chloride and phosgene, possibly solvents and possibly low boilers and inerts as are typically obtained in the preparation of isocyanates by reaction of amines with phosgene, which comprises firstly carrying out a partial or complete condensation of phosgene, then a distillation or stripping step in a column to remove the hydrogen chloride from the bottom product phosgene and subsequently a scrub of the top product hydrogen chloride by means of the process solvent to absorb the phosgene in the process solvent. An after-purification by means of adsorption on activated carbon or by another suitable method can subsequently be carried out to remove solvent residues.