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:
May. 25, 2004
Filed:
Apr. 22, 2002
Andreas Tenten, Maikammer, DE;
Hartmut Hibst, Schriesheim, DE;
Otto Machhammer, Mannheim, DE;
Claus Hechler, Ludwigshafen, DE;
Klaus Joachim Müller-Engel, Stutensee, DE;
Signe Unverricht, Mannheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
In a process for the two-stage catalytic gas-phase oxidation of propene to acrylic acid, the reaction gas starting mixture is passed, in a tube-bundle reactor, with a propene loading of ≧160 l (S.T.P.) of propene/l·h, first over a fixed catalyst bed present in two successive temperature zones A, B and then over a fixed catalyst bed which is housed either in one further temperature zone C or in two further temperature zones D, E, the temperature of the zone A being kept at a lower temperature than the zone B and the temperature of the zone D at a lower temperature than the zone E.