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:
May. 06, 1980
Filed:
Aug. 12, 1976
Applicant:
Inventors:
Tsuneo Kimura, Kita-Kyushu, JP;
Hiroshi Hashizume, Kita-Kyushu, JP;
Assignee:
Mitsubishi Chemical Industries Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562487 ;
Abstract
A purified terephthalic acid is prepared by dissolving a crude terephthalic acid in water at high temperature under high pressure and then contacting the resulting aqueous solution with a catalyst of an active carbon supporting palladium under maintaining the pressure P(kg/cm.sup.2) of the gaseous phase in the catalytic contacting zone in a range of