Production of low sulfur, moderately aromatic distillate fuels by hydrocracking of combined Fischer-Tropsch and petroleum streams
AssigneeChevron U.S.A. Inc.
InventorsStephen Miller, Dennis O'Rear
Life of this patent
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Abstract
The present invention relates to distillate fuels or distillate fuel blend stocks comprising a blend of a Fischer-Tropsch derived product and a petroleum derived product that is hydrocracked under conditions to preserve aromatics. The resulting distillate fuel product is a low sulfur, moderately aromatic distillate fuel. The resulting distillate fuel or distillate fuel blend stock exhibits excellent properties, including good seal swell, density, and thermal stability. The present invention also relates to processes for making these distillate fuels or distillate fuel blend stocks.
Claims26
A distillate fuel comprising a hydrocracked blend of a Fischer-Tropsch derived product and a petroleum derived product, the distillate fuel comprising:
- a) greater than or equal to 2 weight % aromatics;
- b) greater than or equal to 0.1 weight % oxygenates;
- c) less than or equal to 10 ppm sulfur;
- and
- d) less than or equal to 10 ppm nitrogen;
- wherein the distillate fuel has a stability of greater than or equal to 65% according to ASTM D6468 when measured after 90 minutes at 150° C. and a cetane index of greater than or equal to 40.
The distillate fuel of claim 44, wherein the antioxidant is a sulfur-free antioxidant and the distillate fuel has a peroxide content of <5 ppm as determined by ASTM D3703-92 when measured after 4 weeks at 60° C.
A distillate fuel comprising a hydrocracked blend of about 10 to 90 weight % Fischer-Trop;
- a) greater than or equal to 5 weight % aromatics;
- b) greater than or equal to 1 weight % oxygenates;
- c) less than or equal to 10 ppm sulfur;
- and
- d) less than or equal to 10 ppm nitrogen;
- wherein the distillate fuel has a stability of ≧65% as determined by ASTM D6468 when measured after 90 minutes at 150° C.;
- a net heat of combustion of ≧130,000 BTU/gallon as determined by ASTM D240;
- and a cetane index of ≧40.
Dependencies are inferred from the claim text.