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. 25, 2001
Filed:
Jul. 14, 2000
Minoru Kakuda, Chiba-ken, JP;
Takanobu Okamoto, Ibaraki-ken, JP;
Takashi Onozawa, Ibaraki-ken, JP;
Hiroshi Kurata, Ibaraki-ken, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
A process for efficiently separating and recovering a ruthenium compound used as the catalyst in the production of adamantanols. The adamantanols are produced by hydroxylating an adamantane compound in the presence of a ruthenium compound and a salt of hypochlorous acid in a water/organic solvent two-phase system. The hydroxylation product liquid is added with an oxidizing agent to allow the ruthenium compound to be extracted into the organic phase. The ruthenium compound is separated and recovered from the organic phase. Alternatively, the ruthenium compound is back-extracted into the aqueous phase by adding an aqueous alkali solution to the organic phase. Then, the ruthenium compound is separated and recovered from the aqueous phase.