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. 06, 2005
Filed:
Jun. 20, 2003
Joachim Thiel, Neustadt, DE;
Ulrich Hammon, Mannheim, DE;
Dieter Baumann, Frankenthal, DE;
Jörg Heilek, Bammental, DE;
Jürgen Schröder, Ludwigshafen, DE;
Klaus Joachim Müller-engel, Stutensee, DE;
Joachim Thiel, Neustadt, DE;
Ulrich Hammon, Mannheim, DE;
Dieter Baumann, Frankenthal, DE;
Jörg Heilek, Bammental, DE;
Jürgen Schröder, Ludwigshafen, DE;
Klaus Joachim Müller-Engel, Stutensee, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
In a process for preparing acrylic acid, an acrylic acid-containing product gas mixture obtained by catalytic gas phase partial oxidation of a Cprecursor of acrylic acid, after direct cooling with a quench liquid, is fractionally condensed in a separating column provided with internals, rising into itself with sidestream takeoff of crude acrylic acid, and the acrylic acid oligomers which form are dissociated and the resulting dissociation gas is subjected to a countercurrent rectification before it is recycled.