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:
Oct. 13, 2009
Filed:
Jul. 13, 2007
Hisashi Sakaitani, Ibaraki, JP;
Katsuhiro Iura, Ibaraki, JP;
Isao Hagiwara, Ibaraki, JP;
Hiroshi Hasegawa, Ibaraki, JP;
Hisashi Matsuda, Ibaraki, JP;
Hisashi Sakaitani, Ibaraki, JP;
Katsuhiro Iura, Ibaraki, JP;
Isao Hagiwara, Ibaraki, JP;
Hiroshi Hasegawa, Ibaraki, JP;
Hisashi Matsuda, Ibaraki, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
The present invention provides a method for producing hydrogen peroxide, comprising the steps of: alternately reducing and oxidizing a working solution containing anthraquinone compounds as a reaction medium, wherein a mixture of alkyl-substituted anthraquinones and alkyl-substituted tetrahydroanthraquinones in a molar ratio of from 2:1 to 8:1 is used as the anthraquinone compounds in the working solution, in the reduction step all of the tetrahydroanthraquinones and some or all of the anthraquinones in the working solution are reduced; and keeping the content of alkyl-substituted anthrahydroquinones in the working solution after the reduction step and before the oxidation step higher than the content of alkyl-substituted tetrahydroanthrahydroquinones, wherein ethylanthraquinone and ethyltetrahydroanthraquinone are used as anthraquinone compounds in the working solution in a total proportion of both of from 10 to 45 mol % of all of the anthraquinone compounds in the working solution.