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. 20, 2016
Filed:
Nov. 09, 2010
Gerhard Olbert, Dossenheim, DE;
Hans-jürgen Bassler, Neustadt, DE;
Michael Steiniger, Neustadt, DE;
BASF SE, Ludwigshafen, DE;
Abstract
Apparatus for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a stream containing hydrocarbons having at least 4 carbon atoms per molecule, which includes a reactor with reaction tubes into which a solid-state catalyst over which the exothermic reaction of the stream with an oxygen-comprising gas stream takes place is introduced and one or more pumps and heat exchangers located outside the reactor and through which a heat transfer medium formed by a salt melt flows through the intermediate space in the reactor between the reaction tubes and takes up the heat of reaction, with the temperature of the melt being in the range from 350 to 480° C. The reaction tubes are made of a heat-resistant alloy steel which includes at least 0.5% by weight of chromium or at least 0.25% by weight of molybdenum or both.