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:
Apr. 21, 1981
Filed:
Jul. 17, 1979
Imperial Chemical Industries Limited, London, GB;
Abstract
A process for the dimerization of acrylonitrile to predominantly straight-chain C.sub.6 dimers, in which the acrylonitrile is dissolved in an organic solvent capable of donating protons, the acrylonitrile and solvent being substantially dry, and the solution contacted with a catalyst comprising a phosphorus (III) compound of general formula: ##STR1## where Ar is an aromatic nucleus and where groups X, which may be the same or different, are electron-donating substituents of the aromatic nucleus which give rise to a negative Hammett .sigma. constant, and R represents a hydrocarbyl group, the acrylonitrile and solvent being contacted with a low-cost scavenging reagent for a predetermined period of time before being contacted with the aforementioned catalyst.