Process for making bright stock base oil products
AssigneeChevron U.S.A. Inc.
InventorsHoracio Trevino, Minghui Zhang, Guan-Dao Lei, Thomas Ralph Farrell
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Abstract
An improved process for making a bright stock base oil from a base oil feedstream comprising an atmospheric resid feedstock, and, optionally, a base oil feedstock, via hydroprocessing. The process generally involves subjecting a base oil feedstream comprising the atmospheric resid to hydrocracking and dewaxing steps, and optionally to hydrofinishing, to produce base oil product(s) including a bright stock grade base oil product having a viscosity of at least about 22 cSt at 100° C. The invention is useful to make heavy grade base oil products such as bright stock, as well as Group II and/or Group III/III+ base oils.
Claims26
A process for making a bright stock base oil, comprising contacting a base oil feedstream comprising an atmospheric resid feedstock, and,
- optionally, a base oil feedstock, with a hydrocracking catalyst under hydrocracking conditions to form a hydrocracked product;
- separating the hydrocracked product into a gaseous fraction and a liquid fraction;
- contacting the liquid fraction with a dewaxing catalyst under hydroisomerization conditions, to produce a dewaxed product;
- and
- optionally, contacting the dewaxed product with a hydrofinishing catalyst under hydrofinishing conditions to produce a hydrofinished dewaxed product;
- wherein the atmospheric resid feedstock has an API gravity greater than about 25° API, a nickel and vanadium content of less than about 2 ppm, an MCR of less than about 1 wt. %, an asphaltenes content of less than about 500 ppm, a viscosity at 100*C of less than 10 cSt, or in the range of 3-10 cSt;
- and
- wherein the process produces a bright stock base oil product having a viscosity of at least about 22 cSt at 100° C.
A process for making a bright stock base oil having a viscosity of at least about 22 cSt at 100° C. from a base oil feedstream, or a fraction thereof, the process comprising
- providing a base oil feedstream comprising an atmospheric resid feedstock, and, optionally, a base oil feedstock;
- separating the base oil feedstream, or a fraction thereof, into a vacuum gas oil fraction having a front end cut point of about 700° F. or greater and a back end cut point of about 900° F. or less to form a medium vacuum gas oil MVGO fraction and a heavy vacuum gas oil HHVGO fraction;
- contacting a base oil feedstream comprising the HHVGO fraction, and, optionally, a base oil feedstock, with a hydrocracking catalyst under hydrocracking conditions to form a hydrocracked product;
- separating the hydrocracked product into a gaseous fraction and a liquid fraction;
- contacting the liquid fraction with a dewaxing catalyst under hydroisomerization conditions, to produce a dewaxed product;
- and
- optionally, contacting the dewaxed product with a hydrofinishing catalyst under hydrofinishing conditions to produce a hydrofinished dewaxed product;
- wherein the atmospheric resid feedstock has an API gravity greater than about 25° API, a nickel and vanadium content of less than about 2 ppm, an MCR of less than about 1 wt. % and an asphaltenes content of less than about 500 ppm and wherein the process produces a bright stock base oil product having a viscosity of at least about 22 cSt at 100° C.
Dependencies are inferred from the claim text.