Diaminoalkane syntheses via selective amination of dihydric alcohols
AssigneeShell Oil Company
InventorsJohn Frederik Knifton, Daniel John Janitor
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Abstract
Disclosed is a process for selectively producing diaminoalkanes which comprises reacting a dihydric alcohol characterized by two to six carbons, preferably 1,3-propanediol, with excess ammonia and sufficient hydrogen to stabilize a nickel or cobalt-containing hydroamination catalyst, at a temperature of at least 150° C. and a pressure of at least 500 psig, until there is substantial formation of the desired diaminoalkane, wherein said catalyst comprises at least one metal selected from the group consisting of nickel and cobalt, or mixtures thereof, optionally in the presence of one or more promoters, but particularly molybdenum oxide.
Claims30
A one-step process for the production of diaminoalkanes having two to six carbons which comprises:
- introducing into a reactor one or more C2 to C6 dihydric alcohols wherein the hydroxyl groups are separated by at least one carbon;
- reacting said C2 to C6 dihydric alcohol in the presence of excess ammonia and hydrogen and in the presence of a catalyst selected from the group consisting of Raney cobalt catalyst in granular form, Raney nickel catalyst in granular form, a nickel-rich, bulk-metal catalyst containing molybdenum oxide, and a Raney nickel catalyst in extruded form;
- reacting said C2 to C6 dihydric alcohol at a temperature of at least 150° C. and a pressure of at least 500 psi;
- and separating the diaminoalkane product.
Dependencies are inferred from the claim text.