Patent EA-003285-B1 (EA)
Title: METHOD FOR HYDROGENATION OF alpha, omega-DINITRILES AND CATALYST
Inventor: VOIT GUIDO
IPC: B01J23/889
Filed: 1999-02-23
Abstract: 1. A process of the hydrogenation of alpha, omega-dinitriles in the presence a catalyst, which comprises using a catalyst comprising (a) iron or a compound based on iron or mixtures thereof, (b) from 0.001 to 0.3% by weight based on (a) of a promoter based on 2, 3, 4 or 5 elements selected from the group consisting of aluminum, silicon, zirconium, titanium and vanadium, (c) from 0 to 0.3% by weight based on (a) of a compound based on an alkali and/or alkaline earth metal, and also (d) from 0.001 to 1% by weight based on (a) of manganese. 2. A process as claimed in claim 1, wherein the catalyst is obtained by reduction with or without subsequent passivation of a magnetite. 3. A process as claimed in claim 1 or 2, wherein a promoter (b) based on aluminum, silicon and titanium is used. 4. A process as claimed in claims 1-3, wherein a promoter (c) based on magnesium and/or calcium is used. 5. A process as claimed in claims 1-4, wherein the hydrogenation is effected in a fixed bed reactor. 6. A process as claimed in claims 1-5, wherein the catalyst is an unsupported catalyst. 7. A process as claimed in claims 1-6, wherein the alpha, omega-dinitrile is hydrogenated to an alpha, omega-diamine. 8. A process as claimed in claims 7, wherein the alpha, omega-dinitrile used is adiponitrile to obtain hexamethylenediamine. 9. A process as claimed in claims 1-6, wherein the alpha, omega-dinitrile is hydrogenated to an alpha, omega-aminonitrile. 10. A process as claimed in claim 9, wherein alpha, omega-dinitrile used is adiponitrile to obtain 6-aminocapronitrile. 11. A process as claimed in claim 1-10, wherein the alpha, omega-dinitrile used was obtained by hydrocyanation of an alpha, omega-diene having two fewer carbons than the resulting alpha, omega-dinitrile, in the presence of phosphorus catalysts. 12. A process as claimed in claim 12, wherein the weight fraction of phosphorus compound in the resulting alpha, omega -dinitrile is reduced. 13. A process as claimed in claim 12, wherein the weight fraction of phosphorus compound is less than 5 ppm, based on alpha, omega -dinitrile, after reduction in the level of phosphorus compounds. 14. A process as claimed in claim 12, wherein the weight fraction of phosphorus compound is less than 1 ppm, based on alpha, omega -dinitrile, after reduction in the level of phosphorus compounds. 15. Catalyst, comprising (a) iron or a compound based on iron or mixtures thereof, (b) from 0.001 to 0.3% by weight based on (a) of a promoter based on 2, 3, 4 or 5 elements selected from the group consisting of aluminum, silicon, zirconium, titanium and vanadium, (c) from 0 to 0.3% by weight based on (a) of a compound based on an alkali and/or alkaline earth metal, and also (d) from 0.001 to 1% by weight based on (a) of manganese. 16. Use of catalyst, comprising, (a) iron or a compound based on iron or mixtures thereof, (b) from 0.001 to 0.3% by weight based on (a) of a promoter based on 2, 3, 4 or 5 elements selected from the group consisting of aluminum, silicon, zirconium, titanium and vanadium, (c) from 0 to 0.3% by weight based on (a) of a compound based on an alkali and/or alkaline earth metal, and also (d) from 0.001 to 1% by weight based on (a) of manganese as a catalyst for hydrogenation of alpha, omega -dinitriles.