Hydrogenation of aromatic amines to alicyclic amines using a lithium aluminate-based catalyst
AssigneeAir Products and Chemicals, Inc.
InventorsGamini Ananda Vedage, Hao Ding, Matthew J. Engel, Eugene George Lutz, Lenore Ann Emig
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Abstract
The present invention relates to processes for the catalytic hydrogenation of aromatic amines to their acyclic counterparts using a ruthenium catalyst on a lithium aluminate support. The hydrogenation process comprises contacting an aromatic amine with hydrogen in the presence of a ruthenium catalyst under temperature and pressure conditions suitable to effect ring hydrogenation. The process is especially useful for hydrogenating aniline to cyclohexylamine.
Claims24
A process for catalytically hydrogenating aromatic amines to their ring hydrogenated counterparts, the process comprising:
- contacting the aromatic amine with hydrogen in the presence of a catalyst consisting of ruthenium on a lithium aluminate support, wherein the ratio of ruthenium to lithium aluminate support is from about 2 to about 8 weight parts ruthenium per 100 weight parts support.
A process for catalytically hydrogenating aromatic amines of Formula I or Formula II,
- wherein:
- R is hydrogen, halogen, linear or branched C1-C12 alkyl, linear or branched C1-C12 alkoxy, linear or branched C1-C12 alkoxyalkyl, or C1-C12 alkylamino;
- R1 and R2 independently are a hydrogen or linear or branched C1-C12 alkyl;
- X is linear or branched C1-C6 alkylene;
- m is 0, 1, 2, or 3;
- n is 1 or 2;
- and
- p is 0 or 1,
- the process comprising:
- contacting the aromatic amine with hydrogen in the presence of a catalyst consisting of ruthenium on a lithium aluminate support, wherein the ratio of ruthenium to lithium aluminate support is from about 2 to about 8 weight parts ruthenium per 100 weight parts support.
A process for catalytically hydrogenating aniline to cyclohexylamine, the process comprising:
- contacting aniline in a solvent or diluent with hydrogen in the presence of a catalyst consisting of ruthenium on a lithium aluminate support, wherein the ratio of ruthenium to lithium aluminate support is from about 2 to about 8 weight parts ruthenium per 100 weight parts support.
Dependencies are inferred from the claim text.