Continuous reduction of a hindered nitro moiety in aliphatic nitro polyamines
AssigneeUop LLC
InventorsDusan J. Engel, Thomas P. Malloy, Steven R. Paeschke
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Abstract
Nitro polyamines, and especially dinitro polyamines, can be readily reduced by a catalyst of zerovalent nickel on silica where the silica contains not more than 10% alumina and where the nickel content of the finished catalyst may be as high as 85%. The reductions can be performed under relatively low temperatures between 40.degree. and 120.degree. C. to avoid the problem of heat lability of the reactant nitro polyamines. Hydrogenations proceed with good conversion as well as good selectivity and the method offers a means of continuous hydrogenation of nitro polyamines.
Claims16
A method for the continuous conversion of a nitro moiety in a nitro polyamine having the structure X or Y ##STR7## to the corresponding primary amino moiety comprising hydrogenating the nitro moiety by flowing a liquid mass of the nitro polyamine over a solid mass of a catalyst consisting essentially of from about 40 to about 85 weight percent zerovalent nickel dispersed on a support of silica at a temperature from about 40.degree. to about 120.degree. C. and at a partial hydrogen pressure from about 10 up to about 1000 pounds per square inch and recovering the hydrogenated product, where R.sub.1 and R.sub.2 are independently selected from the group consisting of alkyl groups containing from 1 up to about 10 carbon atoms, p is an integer from 1 up to about 4, q is an integer from 2 up to about 6, and R.sub.3 is hydrogen, an alkyl group containing from 1 up to about 10 carbon atoms, or a cycloalkyl group containing from 5 up to about 10 carbon atoms.
Dependencies are inferred from the claim text.