Catalytic deamination for caprolactam production
View Patent ↗Catalytic processes for preparing caprolactam, pipecolinic acid, and their derivatives, from lysine or alpha-amino-epsilon-caprolactam starting materials, and products produced thereby. A process for preparing caprolactam or a derivative thereof, the process comprising contacting a reactant comprising lysine or alpha aminocaprolactam with a catalyst and a gas comprising hydrogen gas, in the presence of a solvent. The catalyst may be provided on a support material, such as a transition metal.
1. A process for preparing caprolactam, the process comprising contacting lysine, alpha aminocaprolactam or a salt thereof, with a transition metal catalyst and hydrogen gas or a hydrogen gas mixture, optionally in the presence of a solvent.
2. The process according to claim 1 , wherein said transition metal catalyst comprises Pt, Au, Pd, Rh, Re, Ru, Ir, Ni, or Mo.
3. The process according to claim 1 , wherein said transition metal catalyst comprises a sulfided transition metal catalyst.
4. The process according to claim 3 , wherein said sulfided transition metal catalyst comprises sulfided Pt, Au, Pd, Rh, Re, Ru, Ir, Ni, or Mo.
5. The process according to claim 1 , wherein said transition metal catalyst is provided on a support material.
6. The process according to claim 5 , wherein said support material comprises carbon, SiO 2 , Al 2 O 3 , TiO 2 , ZrO 2 , aluminosilicates, silica-titania, titania-alumina, or NiO.
7. The process according to claim 1 , wherein said contacting is conducted in the presence of a solvent, and said solvent comprises tetrahydrofuran or ethanol.
8. The process according to claim 1 , wherein said hydrogen gas or hydrogen gas mixture is a hydrogen gas mixture comprising H 2 S.
9. The process according to claim 8 , wherein said hydrogen gas mixture comprises from about 5 to about 50 vol-% of said H 2 S.
10. The process according to claim 1 , wherein said contacting with said hydrogen gas or hydrogen gas mixture is at a pressure from about 50 to about 3000 psi at the start of said process.
11. The process according to claim 1 , wherein contacting is conducted at a temperature of from about 50° C. to about 300° C.
12. The process according to claim 11 , wherein said temperature is from about 250° C. to about 300° C.
13. The process according to claim 1 , wherein said contacting is performed for about 0.1 to about 8 hours.
14. The process according to claim 1 , wherein said lysine is L-lysine.
15. The process according to claim 7 , wherein said solvent comprises ethanol.
16. The process according to claim 1 , wherein said process further comprises isolating said caprolactam produced thereby.
17. The process according to claim 1 , wherein said process is conducted in a single step.
18. A process for preparing pipecolinic acid, comprising the step of contacting lysine with a transition metal catalyst, and hydrogen gas or a hydrogen gas mixture, in the presence of a solvent comprising water.
19. The process according to claim 18 , wherein said transition metal catalyst comprises Pt, Au, Pd, Rh, Re, Ru, Ir, Ni or Mo.
20. The process according to claim 19 , wherein said transition metal catalyst comprises a Pd, Ru, or Raney Ni catalyst.
21. The process according to claim 18 , wherein said transition metal catalyst is provided on a support material comprising carbon, SiO 2 , Al 2 O 3 , TiO 2 , ZrO 2 , aluminosilicates, silica-titania, or titania-alumina.
22. The process according to claim 18 , wherein said hydrogen gas mixture comprises H 2 S.
23. The process according to claim 18 , wherein said contacting with said hydrogen gas or hydrogen gas mixture is at a pressure from about 100 to about 3000 psi at the start of said process.
24. The process according to claim 18 , wherein contacting is conducted at a temperature of from about 50° C. to about 300° C.
25. The process according to claim 24 , wherein said temperature is about 200° C.
26. The process according to claim 18 , wherein said contacting is performed for about 0.1 to about 8 hours.
27. The process according to claim 18 , wherein said lysine is L-lysine.
28. The process according to claim 18 wherein said process further comprises isolating said pipecolinic acid produced thereby.
29. A process for preparing caprolactam, the process comprising: (a) heating lysine or salt thereof to a temperature of about 50° C. to 300° C., optionally in the presence of a first transition metal catalyst to produce a first reaction product comprising alpha amino caprolactam: (b) contacting said first reaction product with hydrogen gas or a hydrogen gas mixture and a second transition metal catalyst to produce a second reaction product comprising caprolactam; (c) recovering caprolactam from the second reaction product to produce a recovered caprolactam.
30. A process according to claim 29 , wherein said heating is conducted in the presence of said first transition metal catalyst.
31. A process according to claim 30 , wherein said first transition metal catalyst is the same as said second transition metal catalyst.
32. The process according to claim 31 wherein said transition metal catalyst comprises Pt, Au, Pd, Rh, Re, Ru, Ir, Ni, or Mo.
33. The process according to claim 31 , wherein said transition metal catalyst comprises a sulfided transition metal catalyst.
34. The process according to claim 33 , wherein said sulfided transition metal catalyst comprises sulfided Pt, Au, Pd, Rh, Re, Ru, Ir, Ni, or Mo.
35. The process according to claim 29 , wherein said transition metal catalyst is provided on a support material.
36. The process according to claim 35 , wherein said support material comprises carbon, SiO 2 , Al 2 O 3 , TiO 2 , ZrO 2 , aluminosilicates, silica-titania, titania-alumina, or NiO.
37. A process according to claim 29 , wherein heating is conducted in the presence of a solvent.
38. The process according to claim 37 , wherein said solvent comprises tetrahydrofuran or ethanol.
39. The process according to claim 29 , wherein said hydrogen gas or hydrogren gas mixture is a hydrogen gas mixture comprising H 2 S.
40. The process according to claim 39 , wherein said hydrogen gas mixture comprises about 5 to about 50 vol-% of said H 2 S.
41. The process according to claim 29 , wherein said contacting with said gas is at a pressure from about 50 to about 3000 psi at the start of said contacting step.
42. The process according to claim 29 , wherein said contacting is conducted at a temperature of from about 50° C. to about 300° C.
43. The process according to claim 42 , wherein said temperature is from about 250° C. to about 300° C.
44. The process according to claim 29 , wherein said reaction is performed for about 0.1 to about 8 hours.
45. The process according to claim 29 , wherein the alpha aminocaprolactam is alpha-L-aminocaprolactam.
46. The process according to claim 29 , wherein said process further comprises isolating caprolactam produced thereby.