Method for producing a base oil having high weight percent total molecules with cycloparaffinic functionality and low weight percent molecules with multicycloparaffinic functionality
AssigneeChevron U.S.A. Inc.
InventorsJohn M. Rosenbaum, Nancy J. Bertrand, Scott C. Deskin, Kamala Krishna, Stephen J. Miller, Susan M. Abernathy
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Abstract
A method for producing a base oil having a high ratio of weight percent molecules with monocycloparaffinic functionality to weight percent molecules with multicycloparaffinic functionality by hydroisomerization dewaxing a selected Fischer-Tropsch wax under hydroisomerization conditions including a hydrogen to feed ratio from about 712.4 to about 3562 liter H2/liter oil.
Claims19
A method for producing a lubricating base oil having greater than 10 weight percent total molecules with cycloparaffinic functionality and less than 0.5 weight percent of molecules with multicycloparaffinic functionality, comprising:
- a. selecting a Fischer-Tropsch derived wax having a weight ratio of molecules having at least 60 or more carbon atoms and molecules having at least 30 carbon atoms of 0.01 or less, wherein the Fischer-Tropsch derived wax has a difference between the T90 and T10 boiling points of at least 171° F. (95° C.);
- and
- b. hydroisomerization dewaxing the Fischer-Tropsch derived wax under a set of conditions comprising a hydrogen to feed ratio from about 712.4 to about 3562 liter H2/liter feed (about 4 to about 20 MSCF/bbl) to produce the lubricating base oil, with the lubricating base oil having a viscosity index greater than an amount defined by the equation:
- VI=28×Ln(Kinematic Viscosity at 100° C.)+95.
A method for producing a lubricating base oil, consisting essentially of;
- a. selecting a Fischer-Tropsch derived wax having a weight ratio of molecules having at least 60 or more carbon atoms and molecules having at least 30 carbon atoms of 0.01 or less, wherein the Fischer-Tropsch derived wax has a difference between the T90 and T10 boiling points of at least 171° F. (95° C.);
- and
- b. hydro isomerization dewaxing the Fischer-Tropsch derived wax under a set of conditions comprising a hydrogen to feed ratio from about 712.4 to about 3562 liter H2/liter feed (about 4 to about 20 MSCF/bbl) to produce the lubricating base oil;
- wherein the lubricating base oil has a kinematic viscosity at 100° C. between 2 and about 3.3 cSt, a weight percent of all molecules with at least one cycloparaffin function greater than 3 times the kinematic viscosity at 100° C., and a weight percent of molecules with muticycloparaffinic functionality less than 0.7.
Dependencies are inferred from the claim text.