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. 13, 2011
Filed:
Apr. 22, 2008
Ulrich Hammon, Mannheim, DE;
Thorsten Friese, Mannheim, DE;
Jochen Petzoldt, Weisenheim am Berg, DE;
Klaus Joachim Mueller-engel, Stutensee, DE;
Ulrich Cremer, Mannheim, DE;
Andreas Raichle, Ludwigshafen, DE;
Ulrich Hammon, Mannheim, DE;
Thorsten Friese, Mannheim, DE;
Jochen Petzoldt, Weisenheim am Berg, DE;
Klaus Joachim Mueller-Engel, Stutensee, DE;
Ulrich Cremer, Mannheim, DE;
Andreas Raichle, Ludwigshafen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process for starting-up a heterogeneously catalyzed partial gas phase oxidation of acrolein to acrylic acid or of methacrolein to methacrylic acid over a fixed catalyst bed disposed in a tube bundle reactor cooled by a heat exchange medium, wherein the temperature of the heat exchange medium is ≧290° C. and the temperature of that reactor plate surface which faces the reaction gas entry mixture and the temperature of the reaction gas entry mixture itself are ≦285° C.