04992529 is referenced by 7 patents and cites 23 patents.

A method for separating metal residues from a polymer wherein a solution or suspension of said polymer is contacted with an aqueous solution containing one or more inorganic acids in the presence of a monocarboxylic acid containing from about 6 to about 20 carbon atoms. The polymer solution or suspension will be contacted with an oxidizing agent either prior to or simultaneously with the contacting with the aqueous inorganic acid solution. The inorganic acid is, preferably, a mineral acid and the monocarboxylic acid is preferably a branched chain alkanoic acid having from about 6 to about 10 carbon atoms. When a monocarboxylic acid is used in combination with the inorganic acid, the amount of metal removed from the polymer is increased and the amount of the aqueous phase containing ionized metal entrained in the organic phase is sugnificantly reduced.

Title
Method for separating metal contaminants from organic polymers
Application Number
7/113976
Publication Number
4992529
Application Date
October 29, 1987
Publication Date
February 12, 1991
Inventor
Ronald J Hoxmeier
Houston
TX, US
Assignee
Shell Oil Company
TX, US
IPC
C08F 6/24
C08F 6/08
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