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:
Feb. 18, 2003
Filed:
Jun. 27, 2001
Applicant:
Inventor:
Holger Geissler, Mainz, DE;
Assignee:
Clariant GmbH, Frankfurt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/38 ; C07D / ; C01B 7/07 ;
U.S. Cl.
CPC ...
B01D 3/38 ; C07D / ; C01B 7/07 ;
Abstract
A process for separating hydrogen chloride from a mixture including an N-(C -C )-alkyl-2-pyrrolidone and hydrogen chloride by distilling the mixture including an N-(C -C )-alkyl-2-pyrrolidone and hydrogen chloride at from 100 to 220° C. and from 50 to 850 hPa in the presence of water in a distillation column, condensing the water as water-hydrogen chloride azeotrope at the top by cooling, returning the water-hydrogen chloride azeotrope to the distillation column, separating off gaseous hydrogen chloride at the top and taking off the N-(C -C )-alkyl-2-pyrrolidone from the bottom.