Group III base stocks and lubricant compositions

Patent metadata

Field	Value
Publication number	US-11352579-B2
Application number	US-201816221742-A
Country	US
Kind code	B2
Filing date	Dec 17, 2018
Priority date	Dec 21, 2017
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

Disclosed are Group III base stocks comprising at least 30 wt % naphthenes, a viscosity index from 120 to 145; and a unique ratio of molecules with multi-ring naphthenes to single ring naphthenes (2R+N/1RN). A method for preparing the base stocks is also disclosed. Also disclosed is a lubricating oil having the base stock as a major component, and an additive as a minor component.

First claim

The invention claimed is:

1. A Group III base stock comprising:
at least about 30 wt % of naphthenes;
about 30 wt % to about 70 wt % paraffins;
wherein the Group III base stock has a viscosity index of about 120 to about 133;
wherein the Group III base stock has a kinematic viscosity at 40° C. (KV40) of about 18.07 cSt to about 19.89 cSt; and
wherein the Group III base stock has a ratio of molecules with multi-ring naphthenes to single ring naphthenes, 2R+N/1RN, of less than about 0.46.

2. The base stock of claim 1 , wherein the base stock has an amount of saturated hydrocarbons of at least 95 wt %.

3. The base stock of claim 1 , wherein the base stock has a kinematic viscosity at 100° C. (KV100) of about 4.0 cSt to about 5.0 cSt.

4. The base stock of claim 1 , wherein the base stock has a kinematic viscosity at 100° C. (KV100) of about 5.0 cSt to about 12.0 cSt.

5. The base stock of claim 4 , wherein the base stock has a viscosity index of about 20 to about 133.

6. A lubricating composition comprising the base stock of claim 1 and an additive.

7. The lubricating composition of claim 6 , wherein the base stock has a viscosity index of about 120 to about 133.

8. A method for producing a diesel fuel and a base stock, comprising:
providing a feed stock comprising a vacuum gas oil;
hydrotreating the feed stock under first effective hydrotreating conditions to produce a first hydrotreated effluent;
hydrotreating the first hydrotreated effluent under second effective hydrotreating conditions to produce a second hydrotreated effluent;
fractionating the second hydrotreated effluent to produce at least a first diesel product fraction and a bottoms fraction;
hydrocracking the bottoms fraction under effective hydrocracking conditions to produce a hydrocracked effluent;
dewaxing the hydrocracked effluent under effective catalytic dewaxing conditions to produce a dewaxed effluent, the dewaxing catalyst including at least one non-dealuminated, unidimensional, 10-member ring pore zeolite, and at least one Group 6 metal, Group 8 metal or combination thereof;
hydrotreating the dewaxed effluent under third effective hydrotreating conditions to produce a third hydrotreated effluent; and
fractionating the third hydrotreated effluent to form at least a second diesel product fraction and the base stock of claim 1 .

9. The method of claim 8 , wherein the feedstock has a solvent dewaxed oil feed viscosity index of about 45 to about 150.

10. The method of claim 8 , wherein the effective hydrotreating conditions include a temperature of about 300° C. to about 450° C., hydrogen partial pressure of about 1500 psi to about 5000 psi (˜10.3 MPa to ˜34.6 MPa), a liquid hourly space velocity of about 0.2 to about 10 hr −1 , and a hydrogen circulation rate of about 35.6 to about 1781 m 3 /m 3 (about 200 scf/bbl to about 10,000 scf/bbl).

11. The method of claim 8 , wherein the effective hydrocracking conditions include a temperature of about 288° C. to about 450° C., a hydrogen partial pressure of about 1000 psig to about 5000 psig about 6.9 MPa to about 34.6 MPa), a liquid hourly space velocity of about 0.05 h −1 to about 10 h −1 , and a hydrogen treat gas rate of about 35.6 m 3 /m 3 to about 1781 m 3 /m 3 (about 200 scf/bbl to about 10,000 scf/bbl).

12. The method of claim 8 , wherein the dewaxing catalyst comprises a molecular sieve having a SiO 2 :Al 2 O 3 ratio of about 200:1 to about 30:1 and comprises about 0.1 wt. % to about 3.33 wt. % framework Al 2 O 3 content, the dewaxing catalyst including about 0.1 wt. % to about 5 wt. % platinum.

13. The method of claim 12 , wherein the molecular sieve is EU-1, ZSM-35, ZSM-11, ZSM-57, NU-87, ZSM-22, EU-2, EU-11, ZBM-30, ZSM-48, ZSM-23, or a combination thereof.

14. The method of claim 13 , wherein the molecular sieve is ZSM-48, ZSM-23, or a combination thereof.

15. The method of claim 9 , wherein the dewaxing catalyst comprises at least one metal oxide, refractory binder, the binder being silica, alumina, titania, zirconia, or silica-alumina.

16. The method of claim 15 , wherein the metal oxide, refractory binder further comprises a second metal oxide, refractory binder different from the first metal oxide, refractory binder.

17. The method of claim 16 , wherein the dewaxing catalyst comprises a micropore surface area to total surface area ratio of greater than or equal to about 25%, wherein the total surface area equals the surface area of the external zeolite plus the surface area of the binder, the surface area of the binder being about 100 m 2 /g or less.

18. The method of claim 17 , wherein the hydrocracking catalyst is a zeolite Y based catalyst.

19. The method of claim 18 , wherein the effective dewaxing conditions include a temperature of about 200° C. to about 450° C., a hydrogen partial pressure of about 250 to about 5000 psi (about 1.8 MPa to 34.6 about MPa), a liquid hourly space velocity of about 0.2 to about 10 hr −1 , and a hydrogen circulation rate of about 35.6 m 3 /m 3 to about 1781 m 3 /m 3 (about 200 scf/bbl to about 10,000 scf/bbl).

20. The method of claim 8 , wherein the total conversion of the hydrocracked, dewaxed bottoms relative to the feedstock is about 30% to about 90%.

21. The method of claim 8 , wherein the feed stock is a solvent dewaxed oil.

22. A Group III base stock comprising:
at least about 30 wt % of naphthenes;
about 30 wt % to about 70 wt % paraffins;
wherein the Group III base stock has:
a viscosity index of 120 to 145;

a kinematic viscosity at 40° C. (KV40) of about 18.07 cSt to about 19.89 cSt; and,
a ratio of molecules with multi-ring naphthenes to single ring naphthenes, 2R+N/1RN, of less than about 0.46.

23. The base stock of claim 22 , wherein the base stock has a pour point of about −10° C. to about −30° C., a Noack volatility of about 0.5 wt. % to about 20 wt. %, and a cold crank simulator (CCS) value at −35° C. of about 100 cP up to about 70,000 cP.

24. A Group III base stock comprising:
at least about 30 wt % of naphthenes; and
about 30 wt % to about 70 wt % paraffins;
wherein the Group III base stock has:
a viscosity index of about 120 to about 145;
a ratio of molecules with multi-ring naphthenes to single ring naphthenes, 2R+N/1RN, of less than about 0.46;
a kinematic viscosity at 100° C. (KV100) of about 8 cSt to about 12 cSt;
a kinematic viscosity at 40° C. (KV40) of about 53.35 cSt to about 59.7 cSt; and
a cold crank simulator (CCS) value at −35° C. of about 10,000 cP to about 70,000 cP.

25. The base stock of claim 24 , wherein the base stock has a pour point of about −10° C. to about −30° C., and a Noack volatility is about 0.5 wt. % to about 20 wt. %.

26. The base stock of claim 1 , wherein the base stock has a KV40 of about 18.07 cSt to about 19 cSt.

27. The base stock of claim 1 , wherein the base stock has a KV40 of about 19 cSt to about 19.89 cSt.

28. The base stovk of claim 24 , wherein the base stock has a weight ratio of molecules with multi-ring naphthenes to single ring naphthenes, 2R+N/1RN, of about 0.36 about 0.4.

Assignees

• Exxonmobil Technology & Engineering Company

Inventors

• Eichelsdoerfer Daniel J
• Dougherty Richard C
• Baker Jr Charles L
• Pathare Rugved P
• Hagee Bryan E

Classifications

• C10G65/12

  including cracking steps and other hydrotreatment steps · CPC title

• C10G45/62

  containing platinum group metals or compounds thereof · CPC title

• C10G47/18

  the catalyst containing platinum group metals or compounds thereof · CPC title

• C10G2400/04

  Diesel oil · CPC title

• C10G2400/06

  Gasoil · CPC title