Claims
- 1. A process for the hydrodenitrification of nitrogen-containing hydrocarbons in a hydrocarbon feedstock having a nitrogen content greater than about 100 parts per million by weight which process comprises:
- (a) contacting at a temperature between about 575.degree. F. and about 775.degree. F. and a pressure between about 600 psi and about 2500 psi in the presence of added hydrogen said feedstock with a first catalyst bed containing a hydrotreating catalyst comprising nickel and tungsten supported on an alumina support, and
- (b) passing the hydrogen and feedstock without modification, from the first catalyst bed to a second catalyst bed where it is contacted at a temperature between about 575.degree. F. and about 775.degree. F. and a pressure between about 600 psi and about 2500 psi with a hydrotreating catalyst comprising nickel and molybdenum supported on an alumina support.
- 2. The process of claim 1 wherein the support for the catalyst in the first catalyst bed has a surface area greater than about 100 m.sup.2 /g and a water pore volume ranging from about 0.2 to about 0.6 cc/g and the support for the catalyst in the second catalyst bed has a surface area greater than about 120 m.sup.2 /g and a water pore volume ranging from about 0.2 to about 0.6 cc/g.
- 3. The process of claim 2 wherein the supports for both catalysts have water pore volumes ranging between from 0.3 to about 0.5 cc/g.
- 4. The process of claim 2 wherein the supports for both catalysts comprises gamma alumina.
- 5. The process of any one of claims 1-4 wherein the catalyst in the first bed the nickel content ranges from about 1 to about 5 percent by weight of the total catalyst, measured as the metal and the tungsten content ranges from about 15 to about 35 percent by weight of the total catalyst, measured as the metal and wherein in the catalyst in the second bed the nickel content ranges from about 1 to about 5 percent by weight of the total catalyst, measured as the metal and the molybdenum content ranges from about 8 to about 20 percent by weight of the total catalysts, measured as the metal.
- 6. The process of any one of the claims 1-4 wherein in the catalyst in the first bed the nickel content ranges from about 2 to about 4 percent by weight of the total catalyst, measured as the metal and the tungsten content ranges from about 20 to about 30 percent by weight of the total catalyst, measured as the metal and wherein in the catalyst in the second bed the nickel content ranges from about 2 to about 4 percent by weight of the total catalyst, measured as the metal and the molybdenum content ranges from about 12 to about 16 percent by weight of the total catalyst, measured as the metal.
- 7. The process of claim 1 wherein the hydrodenitrification of the feedstock takes place at a hydrogen partial pressure ranging from about 500 to about 2200 psig, feedstock is provided at a liquid hourly space velocity ranging from about 0.1 to about 5 hour.sup.-1 and added hydrogen is provided at a feed rate ranging from about 1000 to about 6000 SCF/BBL.
- 8. The process of claim 1 wherein the catalyst selected from the catalyst in the first catalyst bed, the catalyst in the second catalyst bed and the catalyst in both the first and second catalyst beds additionally comprises phosphorus.
- 9. The process of claim 8 wherein the support for the catalyst in the first catalyst bed has a surface area greater than about 100 m.sup.2 /g and a water pore volume ranging from about 0.2 to about 0.6 cc/g and the support for the catalyst in the second catalyst bed has a surface area greater than about 120 m.sup.2 /g and a water pore volume ranging from about 0.2 to about 0.6 cc/g.
- 10. The process of claim 9 wherein the supports for both catalysts have water pore volumes, ranging between from 0.3 to about 0.5 cc/g.
- 11. The process of claim 9 wherein the supports for both catalysts comprises gamma alumina.
- 12. The process of any one of claims 8-11 wherein in the catalyst in the first bed the nickel content ranges from about 1 to about 5 percent by weight of the total catalyst, measured as the metal; the tungsten content ranges from about 15 to about 35 percent by weight of the total catalyst, measured as the metal, and the phosphorus content ranges from about 1 to about 5 percent by weight of the total catalyst, measured as the element and wherein in the catalyst in the second bed the nickel content ranges from about 1 to about 5 percent by weight of the total catalyst, measured as the metal; the molybdenum content ranges from about 8 to about 20 percent by weight of the total catalyst, measured as the metal, and the phosphorus content ranges from about 1 to about 5 percent by weight of the total catalyst, measured as the element.
- 13. The process of any one of claims 8-11 wherein in the catalyst in the first bed the nickel content ranges from about 2 to about 4 percent by weight of the total catalyst, measured as the metal; the tungsten content ranges from about 20 t about +percent by weight of the total catalyst, measured as the metal; and the phosphorous content ranges from about 2 to about 4 percent by weight of the total catalyst, measured as the element and wherein in the catalyst in the second bed the nickel content ranges from about 2 to about 4 percent by weight of the total catalyst, measured as the metal; the molybdenum content ranges from about 12to about 16 percent by weight of the total catalyst, measured as the metal and the phosphorus content ranges from about 2 to about 4 percent by weight of the total catalyst, measured as the element.
- 14. The process of claim 8 wherein the hydrodenitrification of the feedstock takes place at a hydrogen partial pressure ranging from about 500 to about 2200 psig, feedstock is provided at a liquid hourly space velocity ranging from about 0.1 to about 5 hour .sup.-1 and added hydrogen is provided at a feed rate ranging from about 1000 to about 6000 SCF/BBL.
- 15. The process of claim 8 wherein the temperature is steps (a) and (b) ranges from about 600.degree. F. to about 775.degree. F.
Parent Case Info
This is a continuation-in-part of application Ser. No. 606,414, filed Oct. 31, 1990 now abandoned.
US Referenced Citations (24)
Continuation in Parts (1)
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Number |
Date |
Country |
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606414 |
Oct 1990 |
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