Method for producing amines
Amine compounds, more particularly diamine compounds, are prepared by hydrogenating compounds including nitrile functions. The preparation can include the use of a hydrogenation catalyst, adapted for the hydrogenation of nitrile compounds into amine compounds, including Raney nickel as well as iron, chromium, and zinc as doping elements.
1. A process for manufacturing diamine compounds, the process comprising hydrogenating a compound comprising nitrile functional groups by reaction with hydrogen or a gas comprising hydrogen in the presence of a hydrogenation catalyst, wherein the hydrogenation catalyst comprises Raney nickel, iron, chromium and zinc as dopant elements.
2. The process according to claim 1 , wherein the weight composition, expressed by weight of metallic element, of the hydrogenation catalyst is:
Al: from 2′Y° to 10%;
Fe: from 0.3% to 3%;
Cr: from 0.5% to 5%;
Zn: from 0.5% to 5%; and
Ni: balance to 100%.
3. The process according to claim 2 , wherein the weight composition of the hydrogenation catalyst is:
Al: from 5% to 7%;
Fe: from 1% to 2%;
Cr: from 1.5% to 2.5%;
Zn: from 1% to 3%; and
Ni: balance to 100%.
4. The process according to claim 1 , wherein the compound comprising nitrile functional groups is tetramethylene dicyanide.
5. The process according to claim 1 , wherein the diamine compound is hexramethylenediamine.
6. The process according to claim 1 , wherein the hydrogenation is carried out in the presence of a basic compound.
7. The process according to claim 1 , wherein the hydrogenation reaction is carried out under a pressure between 0.1 MPa and 10 MPa.
8. The process according to claim 1 , wherein the hydrogenation reaction is carried out at a temperature between 20° C. and 100° C.