Preparation of N-phenyl-N-alkylphenylenediamines
AssigneeUop LLC
InventorTed Symon
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Abstract
The desired compounds, namely, N-phenyl-N'-alkylphenylenediamines, are prepared by the reductive alkylation of a nitrogen-containing diphenylamine and a ketone in the presence of hydrogen and a hydrogenation catalyst. The desired product may be obtained in a more economical way when effecting the process in a continuous manner by utilizing an organic solvent for the reaction which comprises an ether compound such as a monoether of a dihydric alcohol, a diether of a dihydric alcohol, or a cyclic diether.
Claims14
In a process for the continuous preparation of N-phenyl-N'-alkylphenylenediamine which comprises the reductive alkylation of a nitrogen-containing compound selected from the group consisting of nitrodiphenylamines, nitrosodiphenylamines, and aminodiphenylamines with a ketone in the presence of hydrogen and a hydrogenation catalyst consisting essentially of a Group VIII metal selected from the group consisting essentially of nickel, platinum, and palladium dispersed on a solid support at reaction conditions and recovering the resultant N-phenyl-N'-alkylphenylenediamine, the improvement which consists in effecting said process in the presence of a protic organic solvent consisting essentially of a monoether of a dihydric alcohol.
Dependencies are inferred from the claim text.