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:
Jul. 14, 2009
Filed:
Sep. 14, 2004
Applicants:
Frank Hoefer, Ludwigshafen, DE;
Volker Schliephake, Schifferstadt, DE;
Klaus Joachim Mueller-engel, Stutensee, DE;
Inventors:
Frank Hoefer, Ludwigshafen, DE;
Volker Schliephake, Schifferstadt, DE;
Klaus Joachim Mueller-Engel, Stutensee, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C 7/00 (2006.01); C07C 51/42 (2006.01); B01D 3/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A process for rectificatively separating an acrylic acid-containing liquid, by withdrawing an acrylic acid-rich stream from the rectification column above the feed point and polymerization-inhibiting the upper section of the rectification column by means of diacrylic acid.