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:
Sep. 19, 2000
Filed:
Dec. 21, 1998
Applicant:
Inventors:
Seiji Kojima, Chuo-ku, JP;
Masashi Hatano, Chuo-ku, JP;
Hitoshi Yamamoto, Chuo-ku, JP;
Kiyohiko Imai, Chuo-ku, JP;
Assignee:
Mizusawa Industrial Chemicals, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09C / ; C09C / ; B01J / ; B01J / ;
U.S. Cl.
CPC ...
106486 ; 106488 ; 502 81 ; 502 84 ; 502 85 ;
Abstract
The present invention provides an activated clay for refining aromatic hydrocarbons such as BTX (benzene, toluene, xylene), etc., satisfying the requirements of both excellent life and excellent side-reaction-preventing property. The activated clay for treating aromatic hydrocarbons is obtained by treating dioctahedral smectite clay minerals with an acid so as to possess a BET specific surface area of not smaller than 250 m.sup.2 /g and to contain iron in an amount of not smaller than 2.5% by weight calculated as Fe.sub.2 O.sub.3.