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:
Jun. 16, 2009
Filed:
Apr. 05, 2004
Applicants:
Werner Peschel, Freinsheim, DE;
Hartmut Schoenmakers, Dossenheim, DE;
Klaus Althaus, Mannheim, DE;
Tanja Kirchner, Nierstein, DE;
Hartmut Staatz, Heidelberg, DE;
Inventors:
Werner Peschel, Freinsheim, DE;
Hartmut Schoenmakers, Dossenheim, DE;
Klaus Althaus, Mannheim, DE;
Tanja Kirchner, Nierstein, DE;
Hartmut Staatz, Heidelberg, DE;
Assignee:
BASF Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/42 (2006.01); C07C 231/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a process for distillatively purifying crude dimethylacetamide (crude DMAc) comprising DMAc, low boilers and high boilersby removing the low boilers and the high boilers to obtain pure DMAc in one of the column configurations listed hereinbelow: