Preparing a HGH viscosity index, low branch index dewaxed
AssigneeChevron U.S.A. Inc.
InventorStephen J. Miller
Life of this patent
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Abstract
An integrated process for preparing a lubricating oil base stock includes an isomerization step followed by a solvent dewaxing step. A waxy feed is isomerized to an intermediate pore point, which is at least 6° C. above a target pour point, over a select molecular sieve having specified pore properties. The isomerized oil is then solvent dewaxed to a very low pour point. This process produces a dewaxed lubricating oil base stock which has an exceptionally high viscosity index.
Claims35
A process for preparing an oil suitable for use as a lubricating oil base stock comprising:
- (a) contacting a waxy feed over a dewaxing catalyst comprising a molecular sieve having 1-D pores with a pore diameter of between about 5.0 Å and about 7.0 Å, and at least one Group VIII metal, at a pressure of from about 15 psig (103 kPa) to about 2500 psig (13.8 MPa) to partially dewax the feed by converting between 80% to 97% by weight of the wax contained in the waxy feed thus producing an isomerized oil having a pour point of at least 6° C. above a target pour point;
- and thereafter
- (b) solvent dewaxing the isomerized oil of step (a) to produce a lubricating oil base stock, whereby the lubricating base oil so produced by steps (a) and (b) has a viscosity index greater than 140 and a target pour point of less than or equal to −20° C. with a branching index of less than 1.75.
A process for preparing an oil suitable for use as a lubricating oil base stock comprising:
- (a) contacting a waxy feed over a dewaxing catalyst comprising a molecular sieve having 1-D pores with a pore diameter of between about 5.0 Å and about 7.0 Å, and at least one Group VIII metal, at a pressure of from about 15 psig (103 kPa) to about 2500 psig (13.8 MPa) to partially dewax the feed to remove between about 80% and about 97% by weight of the wax contained in the waxy feed, to produce an isomerized oil having a pour point greater than 0° C.;
- and, thereafter
- (b) solvent dewaxing the isomerized oil of step (a) to produce a lubricating oil base stock with a target pour point less than or equal to −10° C. and a viscosity index of greater than about 140 and a viscosity, measured at 100° C., of 3 cSt or less and also having a branching index of less than 1.75.
A process for preparing an oil suitable for use as a lubricating oil base stock comprising:
- (a) contacting a Fischer-Tropsch waxy feed over a dewaxing catalyst comprising a molecular sieve having 1-D pores with a pore diameter of between about 5.0 Å and about 7.0 Å, and at least one Group VIII metal, at a pressure of from about 15 psig (103 kPa) to about 2500 psig (13.8 MPa) to partially dewax the feed by converting between 80% to 97% by weight of the wax contained in the waxy feed thus producing an isomerized oil having a pour point of at least 6° C. above a target pour point;
- and thereafter
- (b) solvent dewaxing the isomerized oil of step (a) to produce a lubricating oil base stock, whereby the lubricating base oil so produced by steps (a) and (b) has a viscosity index greater than 140 and a target pour point of less than or equal to −20° C. with a branching index of less than 1.75.
A process for preparing an oil suitable for use as a lubricating oil base stock comprising:
- (a) contacting a Fischer-Tropsch waxy feed over a dewaxing catalyst comprising a molecular sieve having 1-D pores with a pore diameter of between about 5.0 Å and about 7.0 Å, and at least one Group VIII metal, at a pressure of from about 15 psig (103 kPa) to about 2500 psig (13.8 MPa) to partially dewax the feed by converting between 80% to 97% by weight of the wax contained in the waxy feed, to produce an isomerized oil having a pour point greater than 0° C.;
- and, thereafter
- (b) solvent dewaxing the isomerized oil of step (a) to produce a lubricating oil base stock with a target pour point less than or equal to −10° and a viscosity index of greater than about 140 and a viscosity, measured at 100° C., of 3 cSt or less and also having a branching index of less than 1.75.
Dependencies are inferred from the claim text.