Hydrogenation process

Details Hydrogenation process Hydrogenation process

1988-11-09

1989-10-24

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253283, 5253293, 525339, C08F 804

Patent

active

048763144

ABSTRACT:
A process for selectively hydrogenating a polymer containing ethylenic unsaturation and cyano groups with a catalyst prepared by combining one or more of certain palladium compounds and one or more of alkylalumoxanes in a suitable solvent or diluent. The hydrogenation is accomplished in a suitable solvent for the polymer at a temperature within the range from about 20.degree. C. to about 175.degree. C. at a total pressure within the range from about 50 to about 1,000 psig and at a hydrogen partial pressure within the range from about 50 to about 950 psig. The hydrogenation can be accomplished so as to convert at least about 85% of the ethylenic unsaturation contained initially in the polymer without converting a significant portion (less than about 5%) of the cyano groups to amine groups. Best results are achieved when the catalyst is prepared by combining the one or more palladium compounds and the one or more alkylalumoxanes in proportions such that the Al:Pd atomic ratio is preferably within the range from about 0.2:1 to about 10:1.

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