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. 19, 1982
Filed:
Oct. 01, 1980
Jon J Harper, Naperville, IL (US);
Stephen J Pietsch, Oak Park, IL (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
Precipitation-free recovery of catalyst metal content of residue from manufacture of trimellitic acid by oxidation with source of molecular oxygen of liquid pseudocumene in presence of cobalt and manganese, cobalt, manganese and cerium, followed by removal of trimellitic acid or its anhydride and, if used, reaction solvent and then separating manganese from the recovered metals. The foregoing is accomplished by extraction of such residue with water, contacting the resulting aqueous extract solution or suspension of insolubles in the aqueous solution with one side of a cation permeable fluoropolymer membrane whose other side is in contact with a hydrohalidic acid to permit metal ions to pass through the membrane, removing the hydrohalidic solution of the catalyst metals, and then after a pH adjustment adding metallic manganese to precipitate cobalt as metal.