Claims
- 1. A process for forming stabilized lubricating oil resistant to oxidation and sludge formation upon exposure to an oxidative environment which comprises the steps of (1) contacting a hydrocarbon lubricating oil stock with elemental sulfur in amount of from about 0.05 to about 1.0 percent by weight of said oil stock at a temperature of between about 25.degree. C. and about 130.degree. C. and pressure of from about 0 psig to about 100 psig for a contact time of from about 0.1 hour to about 10 hours, and (2) contacting the oil product from step (1) with hydrogen and with alumina impregnated with at least about 10 weight percent MoO.sub.3 and at least about 2.5 weight percent CoO, said impregnated alumina having at least 50 percent of the pores thereof in a pore diameter of 50 Angstrom units or more, at a temperature of from about 80.degree. C. to about 190.degree. C., a pressure of from about 100 psig to about 300 psig, a hydrogen circulation rate of from about 100 scf/bbl to about 1500 scf/bbl and a liquid hourly space velocity of from about 0.1 hr.sup..sup.-1 to about 10 hu.sup..sup.-1.
- 2. The process of claim 1 wherein said oil stock has a boiling range of above about 600.degree. F.
- 3. The process of claim 1 wherein step (1) is conducted in an ultrasonic bath.
- 4. The process of claim 1 wherein said oil stock comprises a lubricating oil fraction obtained by fractionation of a crude oil identified as Pennsylvania, Midcontinent, Gulf Coast, West Texas, Amal, Kuwait, Barco or Arabian.
- 5. The process of claim 2 wherein said oil stock comprises at least a substantial part of one obtained by fractionation of a crude oil identified as Pennsylvania Midcontinent, Gulf Coast, West Texas, Amal, Kuwait, Barco or Arabian.
- 6. The process of claim 1 wherein said oil stock is a lubricating oil fraction obtained by fractionation of crude oil identified as Arabian.
- 7. The process of claim 1 wherein said elemental sulfur is crystalline.
- 8. The process of claim 7 wherein said crystalline sulfur is obtained by recrystallization of sublimed sulfur from toluene.
- 9. The process of claim 1 wherein step (1) is conducted at a temperature of from about 25.degree. C. to about 70.degree. C., a pressure of from about 0 psig to about 5 psig and a contact time of from about 0.5 hour to about 4 hours or more, and step (2) is conducted at a temperature of from about 150.degree. C. to about 175.degree. C., a pressure of from about 150 psig to about 250 psig, a hydrogen circulation rate of from about 500 scf/bbl to about 1100 scf/bbl and a liquid hourly space velocity of from about 0.5 hr.sup..sup.-1 to about 2.5 hr.sup..sup.-1.
- 10. The process of claim 9 wherein the hydrocarbon lubricating oil stock is contacted with elemental sulfur in amount of from about 0.1 to about 0.5 percent by weight of said oil stock in step (1).
- 11. The process of claim 1 wherein the alumina in step (2) is impregnated with from about 2.5 to about 4 weight percent CoO and from about 10 to about 15 weight percent MoO.sub.3.
- 12. The process of claim 9 wherein the alumina in step (2) is impregnated with from about 2.5 to about 3.5 weight percent CoO and from about 10.5 to about 13.5 weight percent MoO.sub.3.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation-in-part of application Ser. No. 495,591, filed Aug. 8, 1974, now U.S. Pat. No. 3,972,853.
US Referenced Citations (8)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
495591 |
Aug 1974 |
|