Claims
- 1. A process for making a lubricant oil of low pour point which comprises a) catalytically dewaxing a lube boiling range feedstock in the presence of hydrogen over a dewaxing catalyst comprising an intermediate pore size zeolite having the structure of ZSM-5 in the hydrogen or decationized form, during which dewaxing the temperature is progressively increased to maintain a substantially constant product pour point to produce a lubricant oil product of improved oxidation stability, b) thereafter catalytically dewaxing a light distillate lube boiling range feedstock in the presence of hydrogen over said dewaxing catalyst; c) thereafter exposing said dewaxing catalyst to hydrogen reactivation conditions, and d) thereafter repeating step a).
- 2. The process according to claim 1 in which the dewaxing cycle is carried out over a temperature range of 525.degree. to 725.degree. F., said heavy lube boiling range feedstock is selected from the group consisting of Heavy Neutral and Bright Stock, and said light distillate lube boiling range feedstock is Light Neutral.
- 3. The process according to claim 1 in which said heavy lube boiling range feedstock is sequenced during a dewaxing cycle in the order of Heavy Neutral and Bright Stock.
- 4. The process according to claim 1 which is carried out at a hydrogen pressure of 200 to 3000 psig, a temperature of 525.degree. F. to 725.degree. F. and a space velocity of 0.20 to 5.0 LHSV.
- 5. The process according to claim 1 wherein said feedstocks comprise distillate lube boiling range feedstocks.
- 6. The process according to claim 5 wherein at least one of said feedstocks is a raffinate.
- 7. The process according to claim 1 wherein said heavy lube boiling range feedstock is characterized by a 50% boiling point of greater than 850.degree. F. and a kinetic viscosity at 100.degree. C. of greater than 9 centistokes, and said light distillate lube boiling range feedstock is characterized by a 50% boiling point of less than about 850.degree. F. and a kinetic viscosity at 100.degree. C. of less than 9 centistokes.
- 8. The process according to claim 1 which comprises dewaxing said light distillate lube boiling range feedstock for at least 2 days.
- 9. The process according to claim 1 which comprises dewaxing said light distillate lube boiling range feedstock for at least 30 days.
- 10. The process according to claim 1 wherein said hydrogen reactivation is carried out at 800.degree. to 1100.degree. F. for 4 to 30 hours at 100 to 3000 psig H.sub.2.
- 11. The process according to claim 1 wherein said hydrogen reactivation is carried out at 900.degree. to 1000.degree. F. for 16 to 20 hours at 350 to 500 psig H.sub.2.
- 12. A process for making a lubricant oil of low pour point and improved oxidation stability from lube boiling range feedstock which comprises a) catalytically dewaxing a relatively heavy lube boiling range feedstock characterized by a 50% boiling point of greater than 850.degree. F. and a kinetic viscosity at 100.degree. C. of greater than 9 centistokes in the presence of hydrogen over a dewaxing catalyst comprising an intermediate pore size zeolite having the structure of ZSM-5 in the hydrogen or decationized form, during a dewaxing cycle in which the temperature is progressively increased to maintain a substantially constant product pour point; b) thereafter catalytically dewaxing a relatively light distillate lube boiling range feedstock characterized by a 50% boiling point of less than about 850.degree. F. and a kinetic viscosity at 100.degree. C. of less than 9 centistokes in the presence of hydrogen over said dewaxing catalyst; c) thereafter hydrogen reactivating said dewaxing catalyst; and d) repeating a) to c) at least once.
- 13. A process according to claim 12 in which the dewaxing cycle is carried out over a temperature range of 525.degree. to 725.degree. F.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 07/728,752, filed Jul. 8, 1991 now abandoned by T. R. Forbus and C. P. Kyan which is a continuation of Ser. No. 544,088, filed Jun. 27, 1990 now abandoned, which in turn is a continuation of Ser. No. 359,605, filed Jun. 1, 1989 now abandoned.
US Referenced Citations (16)
Continuations (2)
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544088 |
Jun 1990 |
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359605 |
Jun 1989 |
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Continuation in Parts (1)
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728752 |
Jul 1991 |
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