Aminonitrile production
AssigneeE. I. Du Pont de Nemours and Company
InventorAlex Sergey Ionkin
Life of this patent
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Abstract
Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and tetraalkylammonium hydroxide and/or tetraalkylphosphonium hydroxide additive.
Claims27
A process for the partial hydrogenation of a dinitrile to an aminonitrile, comprising the step of contacting the dinitrile with a hydrogen-containing fluid in the presence of (a) a solvent comprising liquid ammonia, an alcohol or both;
- (b) a hydrogenation catalyst;
- and (c) an effective amount of additive comprising a compound selected from the group consisting of a tetraalkylammonium hydroxide compound and a tetraalkylphosphonium hydroxide compound.
An improved process for the preparing an aminonitrile from a corresponding dinitrile by contacting the dinitrile with a hydrogen-containing fluid in the presence of a solvent and a hydrogenation catalyst, wherein the improvement comprises contacting the dinitrile, hydrogen-containing fluid, solvent and hydrogenation catalyst in the further presence of an effective amount of an additive comprising a compound selected from the group consisting of a tetraalkylammonium hydroxide compound and a tetraalkylphosphonium hydroxide compound.
A method for improving the yield of and/or selectivity to an aminonitrile obtained by partially hydrogenating a corresponding dinitrile with a hydrogen-containing fluid in the presence of a solvent and a hydrogenation catalyst, comprising the step of partially hydrogenating the dinitrile in the further presence of an effective amount of an additive comprising a compound selected from the group consisting of a tetraalkylammonium hydroxide compound and a tetraalkylphosphonium hydroxide compound.
A catalyst composition comprising a combination of (1) a hydrogenation catalyst suitable for hydrogenating a dinitrile to an aminonitrile;
- and (2) an additive comprising a compound selected from the group consisting of a tetraalkylammonium hydroxide compound and a tetraalkylphosphonium hydroxide compound.
Dependencies are inferred from the claim text.