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:
Dec. 15, 2015
Filed:
Jul. 29, 2011
Stefan Altwasser, Wachenheim, DE;
Jürgen Zühlke, Speyer, DE;
Frank Rosowski, Mannheim, DE;
Michael Krämer, Mannheim, DE;
Stefan Altwasser, Wachenheim, DE;
Jürgen Zühlke, Speyer, DE;
Frank Rosowski, Mannheim, DE;
Michael Krämer, Mannheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The present invention relates to a catalyst for the oxidation of o-xylene and/or naphthalene to phthalic anhydride, which has a plurality of catalyst zones which are arranged in series in the reaction tube and have been produced using an antimony trioxide which comprises a significant proportion of valentinite. The present invention further relates to a process for gas-phase oxidation, in which a gas stream comprising at least one hydrocarbon and molecular oxygen is passed through a catalyst produced using an antimony trioxide which comprises a significant proportion of valentinite.