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. 03, 2015
Filed:
Jun. 12, 2009
Mitsuo Konishi, Tokyo, JP;
Mitsuo Konishi, Tokyo, JP;
ASAHI KASEI CHEMICALS CORPORATION, Tokyo, JP;
Abstract
There is provided a method for producing cycloolefin where the nickel which elutes in the liquid-contact portion of the reactor is removed from the reaction system of the partial hydrogenation reaction and cycloolefin can be stably produced from a monocyclic aromatic hydrocarbon over a long term. A method for producing a cycloolefin by a partial hydrogenation reaction of a monocyclic aromatic hydrocarbon in an aqueous phase, which contains a metal salt-containing acidic aqueous solution and a ruthenium catalyst in a reactor with a liquid-contact portion formed of a nickel-containing material, the method comprising a first step of bringing at least a part of the ruthenium catalyst contained in the aqueous phase into contact with oxygen, a second step of separating the aqueous phase containing the ruthenium catalyst that has been processed in the first step into a first phase containing the ruthenium catalyst at a high ratio and a second phase containing the ruthenium catalyst at a lower ratio than the first phase, and a third step of feeding the first phase to a reaction system of a partial hydrogenation reaction.