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:
Jan. 29, 1991
Filed:
Dec. 26, 1989
Applicant:
Inventors:
Assignee:
Mitsubishi Gas Chemical Co., Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ; C01G / ; C07C / ;
U.S. Cl.
CPC ...
502 24 ; 423140 ; 423149 ; 502 20 ; 502 31 ; 502 34 ; 562406 ;
Abstract
An efficient process for recovering a catalyst used in the preparation of .alpha.-(4-isobutylphenyl)propionic acid, which comprises recovering part of a nickel catalyst component, such as nickel carbonyl, from a purge gas, concentrating a reaction product mixture, adding an organic solvent thereto to extract the reaction product, then separating and recovering the majority of the catalyst components from the extraction residue.