Process for the hydrogenation of olefinic unsaturation in an ali

Details Process for the hydrogenation of olefinic unsaturation in an ali Process for the hydrogenation of olefinic unsaturation in an ali

1977-08-22

1979-05-01

Brust, Joseph Paul

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

585277, 562592, 562496, 260465R, 260583K, 260583P, 560190, 568903, 568671, C07C12000, C07C12120

Patent

active

041523512

ABSTRACT:
Aliphatic unsaturated material or compounds are hydrogenated. Specifically, unsaturated dinitrile, e.g., 5-methyl-4-nonenedinitrile, 2,4-dimethyl-4-octenedinitrile, 2,4-dimethyl-3-octenedinitrile, 2,4,6-trimethyl-3-heptenedinitrile, 5-methylenenonanedinitrile, 2-methyl-4-methyleneoctanedinitrile and 2,6-dimethyl-4-methyleneheptanedinitrile, in a mixture resulting from reaction of isobutylene and acrylonitrile are hydrogenated in presence of a palladium hydrogenation catalyst disposed on an active alumina support also having disposed thereon an adjuvant selected from cerium, thorium, manganese, praseodymium, neodymium and samarium. A specific combination of adjuvants namely cerium together with lanthanum was found to improve the hydrogenation at low levels of cerium.
Other aliphatic compounds which can be hydrogenated according to the invention include among others ethylene, 1,3-butadiene, cinnamic acid, 5-methyl-4-nonenedicarboxylic acid, diethyl 5-methylene-nonanedicarboxylate, etc.
Other catalyst supports are disclosed as are conditions for the hydrogenation.

REFERENCES:
patent: 2166971 (1939-07-01), Schmidt et al.
patent: 3404098 (1968-10-01), Stiles
patent: 3629145 (1971-12-01), Morikawa et al.
patent: 3794588 (1974-02-01), Stiles

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