Method for the preparation of C
The present invention relates to a process for preparing C 3 -C 12 alcohols by catalytically hydrogenating the corresponding aldehydes at a temperature in the range of 50-250° C. and a pressure in the range of 5-150 bar in the presence of a supported activated Raney-type catalyst, characterized in that the support body is a metal foam and the metal is selected from the group consisting of cobalt, nickel and copper and mixtures thereof.
1. A process for preparing C 3 -C 12 alcohols by catalytically hydrogenating the corresponding aldehydes at a temperature in the range of 50-250° C. and a pressure in the range of 5-150 bar in the presence of a supported activated Raney-type catalyst, wherein the supported activated Raney-type catalyst comprises a support body that is a metal foam and the metal is selected from the group consisting of: cobalt; nickel; copper; and mixtures thereof.
2. The process of claim 1 , wherein a C 3 -C 9 aldehyde is used in the hydrogenation.
3. The process of claim 1 , wherein isononanal or butyraldehyde is used as the aldehyde in the hydrogenation.
4. The process of claim 1 , wherein the metal is nickel.
5. The process of claim 1 , wherein the supported activated Raney-type catalyst contains 85-95% by weight of nickel and 5-15% by weight of aluminium, based on the total weight of the catalyst.
6. The process of claim 5 , wherein the supported activated Raney-type catalyst additionally contains up to 3% by weight of molybdenum, based on the total weight of the catalyst.
7. The process of claim 1 , wherein the supported activated Raney-type catalyst has the following properties:
a) a BET surface area of 1-200 m 2 /g, and
b) macroscopic pores in the range of 100-5000 μm.
8. The process of claim 1 , wherein the supported activated Raney-type catalyst is cylindrical, annular, cuboidal, parallelepipedal or cubic.
9. The process of claim 8 , wherein the supported activated Raney-type catalyst is used in the form of a fixed bed of bulk material.
10. The process of claim 9 , wherein the supported activated Raney-type catalyst is cuboidal and has a maximum edge length of 50 mm.
11. The process of claim 1 , wherein the hydrogenation is conducted continuously.
12. The process of claim 1 , wherein the aldehyde is obtained by an oxo process.
13. The process of claim 5 , wherein the supported activated Raney-type catalyst has the following properties:
a) a BET surface area of 1-200 m 2 /g, and
b) macroscopic pores in the range of 100-5000 μm.
14. The process of claim 13 , wherein the supported activated Raney-type catalyst is cylindrical, annular, cuboidal, parallelepipedal or cubic.
15. The process of claim 14 , wherein the supported activated Raney-type catalyst is used in the form of a fixed bed of bulk material.
16. The process of claim 15 , wherein the supported activated Raney-type catalyst is cuboidal and has a maximum edge length of 50 mm.
17. The process of claim 13 , wherein the hydrogenation is conducted continuously.
18. The process of claim 13 , wherein the aldehyde is obtained by an oxo process.
19. The process of claim 13 , wherein a C 3 -C 9 aldehyde is used in the hydrogenation.
20. The process of claim 13 , wherein isononanal or butyraldehyde is used as the aldehyde in the hydrogenation.