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:
Nov. 04, 2014
Filed:
Oct. 27, 2011
Yuta Nakazawa, Sanyoonoda, JP;
Susumu Matsumoto, Sanyoonoda, JP;
Tomoaki Kobayashi, Sanyoonoda, JP;
Tatsuhiko Kurakami, Sanyoonoda, JP;
Yuta Nakazawa, Sanyoonoda, JP;
Susumu Matsumoto, Sanyoonoda, JP;
Tomoaki Kobayashi, Sanyoonoda, JP;
Tatsuhiko Kurakami, Sanyoonoda, JP;
NipponKayaku KabushikiKaisha, Tokyo, JP;
Abstract
The present invention relates to a method for producing acrylic acid through vapor-phase contact oxidation of acrolein, wherein a reactor tube is divided into at least two catalyst layers, and catalysts having a higher activity are charged in the reactor tube sequentially toward an outlet port side from a material source gas inlet port side for a reaction therein to give acrylic acid, and wherein a catalyst activity-controlling method is a method comprising: a step of mixing a molybdenum-containing compound, a vanadium-containing compound, a copper-containing compound and an antimony-containing compound with water, then drying and calcining a resulting mixture, in which a catalytically-active element composition is kept constant but material source compounds are made to vary in type to give composite metal oxides having a different activity.