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. 19, 2017
Filed:
Jun. 16, 2014
Applicant:
Basf SE, Ludwigshafen, DE;
Inventors:
Nico F. Fischer, Heidelberg, DE;
Michael Krämer, Katzweiler, DE;
Jürgen Zühlke, Speyer, DE;
Hans-Martin Allmann, Neunkirchen, DE;
Assignee:
BASF SE, Ludwigshafen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 307/89 (2006.01); C07C 51/265 (2006.01); C07C 51/31 (2006.01);
U.S. Cl.
CPC ...
C07D 307/89 (2013.01); C07C 51/265 (2013.01); C07C 51/313 (2013.01);
Abstract
The present invention relates to a process for preparing phthalic anhydride by gas phase oxidation of aromatic hydrocarbons, in which a gas stream comprising at least one aromatic hydrocarbon and molecular oxygen is passed continuously over a thermostatted catalyst and the supply of the at least one aromatic hydrocarbon to the catalyst is temporarily interrupted after putting the catalyst on stream.