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. 26, 1982
Filed:
Oct. 01, 1980
Applicant:
Inventor:
Jon J Harper, Naperville, IL (US);
Assignee:
Standard Oil Company (Indiana), Chicago, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
252410 ; 2524 / ; 7510 / ; 423 215 ; 423 50 ; 423140 ;
Abstract
Precipitation-free recovery of catalyst metal content of residue from manufacture of benzene carboxylic acid by oxidation with source of molecular oxygen of liquid methyl-substituted benzene in presence of cobalt, manganese, cerium, and mixtures of two or more thereof followed by removal of benzene carboxylic acid and, if used, reaction solvent. Such precipitation-free method comprises extracting such residue with water, contacting the resulting extract solution or suspension of insolubles in extract solution with one side of a cation permeable fluoropolymer membrane and contacting the opposite side of the membrane with a hydrohalidic acid.