Catalytic process for converting renewable resources into paraffins for use as diesel blending stocks
View Patent ↗A process for converting renewable resources such as vegetable oil and animal fat into paraffins in a single step which comprises contacting a feed which is a renewable resources with hydrogen and a catalyst which comprises a non-precious metal a first oxide and optionally a second oxide wherein at least one of the first oxide or second oxide comprises a zeolite, through hydrodeoxygenation and one or both of hydroisomerization and hydrocracking.
1. A process for hydrotreating a liquid feed comprising
(a) providing a liquid feed which is a renewable resource comprising aliphatic hydrocarbon chains having C 12 to C 20 moieties; and
(b) contacting the feed with a catalyst in the presence of hydrogen at a temperature of 250 to 425° C. and a pressure of 500 to 2500 psig (3,450 to 17,250 kPa) such that isomerization and hydrocracking occur to produce a paraffin (hydrocarbon) product,
wherein the catalyst comprises one or more active metals selected from the group consisting of nickel, cobalt, and combinations thereof and a first oxide selected from the group consisting of alumina, silica, titania, zirconia, kieselguhr, silica-alumina, and combinations thereof, and a second oxide wherein the second oxide comprises a zeolite and wherein the zeolite is present in an amount of at least 10 wt %, based on the total catalyst weight, and wherein the first oxide is used as a support for the active metal and wherein the second oxide is physically mixed with the active metal and the first oxide.
2. The process of claim 1 wherein the feed is an oil derived from plants and/or animals and comprises one or more triglyceride.
3. The process of claim 2 wherein the triglyceride is derived from a plant selected from the group consisting of pine, rape seed, sunflower, palm, jathropa, seashore mallow and combinations of two or more thereof.
4. The process of claim 1 wherein the feed is a vegetable oil selected from the group consisting of canola oil, palm oil, coconut oil, palm kernel oil, sunflower oil, soybean oil, crude tall oil, and combinations of two or more thereof.
5. The process of claim 1 wherein the concentration of metal in the catalyst is 45 to 60 weight percent.
6. The process of claim 5 wherein the catalyst comprises nickel which is in reduced form.
7. The process of claim 6 wherein the catalyst is reduced by treating the catalyst with hydrogen at a temperature from 100° C. to 400° C.
8. The process of claim 6 wherein the zeolite is present in an amount of at least 25 wt %, based on the total catalyst weight.
9. The process of claim 7 wherein the zeolite is present in an amount of 25-50 wt %, based on the total catalyst weight.
10. The process of dam 6 wherein the renewable resource comprises over 50% C 18 -based components.
11. The process of claim 1 wherein the zeolite is selected from the group consisting of MFI (ZSM-5), MEL (ZSM-11), FAU (zeolite Y or USY), MOR (mordenite), BEA (beta).
12. The process of claim 1 wherein the zeolite is present in an amount of 25-50 wt %.
13. The process of claim 1 wherein the temperature is 300 to 400° C.
14. The process of claim 13 wherein the temperature is 325 to 375° C.
15. The process of claim 1 wherein the pressure is 1000 to 2000 psig (7000 to 13,900 kPa).
16. The process of claim 1 wherein the process is a continuous process and the reactor is a fixed bed reactor or a continuously stirred tank reactor.
17. The process of claim 16 wherein the reactor is a fixed bed reactor.
18. The process of claim 16 wherein the feed is contacted with a solvent or diluent and hydrogen to provide a liquid feed/solvent/hydrogen or liquid feed/diluent/hydrogen mixture in advance of contacting the feed with the catalyst.
19. The process of claim 18 wherein a portion of the product is recycled back to the reactor as a recycle stream and blended with fresh feed and hydrogen for use as solvent or diluent.
20. The process of claim 17 wherein the liquid feed/solvent/hydrogen or liquid feed/diluent/hydrogen mixture is a substantially hydrogen-gas-free liquid feed stream.