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:
Mar. 28, 2006
Filed:
Jun. 20, 2003
Martin Dieterle, Mannheim, DE;
Jochen Petzoldt, Mannheim, DE;
Klaus Joachim Müller-engel, Stutensee, DE;
Hans Martan, Frankenthal, DE;
Martin Dieterle, Mannheim, DE;
Jochen Petzoldt, Mannheim, DE;
Klaus Joachim Müller-Engel, Stutensee, DE;
Hans Martan, Frankenthal, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
In a process for partially oxidizing propene to acrylic acid in the gas phase under heterogeneous catalysis, a starting reaction gas mixture comprising propene and oxygen and having a specific composition is oxidized in a first reaction stage over a first fixed catalyst bed having a volume-specific activity which is constant or increases in the flow direction and the acrolein-containing product gas mixture of the first reaction stage is subsequently oxidized in a second reaction stage over a second fixed catalyst bed having a volume-specific activity increasing in the flow direction, and the shaped catalyst bodies of both fixed catalyst beds are annular and each have a specific multimetal oxide composition.