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US 4,952,541 AGranted
Acrylonitrile dimerization process and method of treating residual catalyst
AssigneeMonsanto Company
InventorsWilliam A. Heckle, Marion J. Mathews, III, P. Robert Peoples
Life of this patent
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Abstract
Treatment of dicyanobutene to inactivate residual dimerization catalyst facilitates hydrogenation of the product to form adiponitrile.
Claims4
A process for treating dicyanobutene containing residual dimerization catalyst selected from the group consisting of organic phosphorus (III) compounds represented by the formulae:
- ##STR3## wherein R.sub.1 is a hydrocarbyl group, R.sub.2 is an alkoxy or cycloalkoxy group, R.sub.3 is a hydrocarbyl, alkoxy or cycloalkoxy group, and R.sub.4 is a divalent hydrocarbyl group, said process comprising contacting the residual catalyst with an oxidizing agent and converting the catalytic phosphorus to the plus 5 oxidation state.
Dependencies are inferred from the claim text.