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:
Dec. 17, 1991
Filed:
Apr. 16, 1990
Applicant:
Inventor:
Raymond C Tsiang, Sugarland, TX (US);
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
528483 ; 528486 ; 528490 ; 528491 ; 528499 ;
Abstract
A process is provided for removing Group VIII metal hydrogenation catalyst residue from a polymer which comprises oxidizing the hydrogenation catalyst residue in the polymer, contacting the polymer with an aqueous solution of dicarboxylic acid and separating the hydrogenation catalyst residue from the polymer. Preferred dicarboxylic acids include adipic and azelaic acids. The amount of water contacted with the polymer cement is less than that which would form an aqueous phase. Solid particulates comprising hydrogenation catalyst metal form within minutes upon the addition of the aqueous dicarboxylic acid to the polymer cement.