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. 16, 2010
Filed:
Apr. 27, 2007
Hiroshi Hasegawa, Ibaraki, JP;
Katsuhiro Iura, Ibaraki, JP;
Isao Hagiwara, Ibaraki, JP;
Shinjiro Sawamoto, Ibaraki, JP;
Hiroshi Hasegawa, Ibaraki, JP;
Katsuhiro Iura, Ibaraki, JP;
Isao Hagiwara, Ibaraki, JP;
Shinjiro Sawamoto, Ibaraki, JP;
Mitsubishi Gas Chemical Compayn, Inc., Tokyo, JP;
Abstract
A method for producing hydrogen peroxide by an anthraquinone process includes the steps of: reducing with hydrogen a working solution containing an organic solvent and anthraquinone in the presence of a hydrogenation catalyst; and activating the hydrogenation catalyst when a hydrogenation selectivity has decreased due to repeated use, wherein the catalyst activation step includes a step of treating the hydrogenation catalyst with a first alkaline aqueous solution of pH 10 or above containing an alkali metal, and then washing the treated hydrogenation catalyst with water or a second alkaline aqueous solution that is more weakly alkaline than the first alkaline aqueous solution so as to set a catalyst soak solution comprising 5 parts by weight of pure water in admixture with 1 part by weight of the activated hydrogenation catalyst to a pH of 8.0 or above.