Group iii base stocks and lubricant compositions
AssigneeExxonMobil Technology and Engineering Company
InventorsDaniel J. EICHELSDOERFER, Richard C. DOUGHERTY, Charles L. BAKER, JR., Rugved P. PATHARE, Bryan E. HAGEE
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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.
Claims29
A Group III base stock comprising:
- at least about 30 wt % of naphthenes;
- wherein the Group III base stock has a viscosity index of from 120 up to 133;
- 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.
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 a base stock product fraction, wherein the Group III lubricant base stock product fraction includes greater than or equal to 90 wt. % saturates, a kinematic viscosity at 100° C. greater than 2 cSt and has a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.46.
A Group III base stock comprising:
- at least about 30 wt % of naphthenes;
- a viscosity index of from 120 up to 145 that is less than or equal to 142*(1−0.0025 exp (8*(2R+N/1RN))).
A Group III base stock comprising:
- at least about 30 wt % of naphthenes;
- a viscosity index of from 120 up to 145 that is less than or equal to 150.07*(1−0.0106*exp(4.5*(2R+N/1RN))).
Dependencies are inferred from the claim text.