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
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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.
Claims30
A process to prepare a distillate fuel comprising:
- a. blending a Fischer-Tropsch derived product with a petroleum derived product to provide a blend;
- b. hydrocracking the blend;
- and
- c. recovering a distillate fuel comprising:
- i. ≧2 weight % aromatics;
- ii. ≧0.1 weight % oxygenates;
- iii. ≦10 ppm sulfur;
- and
- iv. ≦10 ppm nitrogen;
- wherein the distillate fuel has a stability of ≧65% according to ASTM D6468 when measured after 90 minutes at 150° C. and a cetane index of ≧40.
A process to prepare a distillate fuel comprising:
- a. blending (i) a Fischer-Tropsch derived product comprising ≧50 weight % hydrocarbons boiling above 650° F. as determined by ASTM D2887 with (ii) a petroleum derived product comprising ≧50 weight % hydrocarbons boiling above 650° F. as determined by ASTM D2887 and ≧500 ppm nitrogen to provide a blend such that the blend comprises between 10 and 90 weight % of the Fischer-Tropsch derived product;
- b. hydrocracking the blend under conditions of a temperature of ≧600° F. and pressure of ≦3000 psig;
- and
- c. recovering a distillate fuel comprising:
- i) ≧2 weight % aromatics;
- ii) ≧0.1 weight % oxygenates;
- iii) ≦10 ppm sulfur;
- and
- iv) ≦10 ppm nitrogen;
- wherein the distillate fuel has a stability of ≧65% according to ASTM D6468 when measured after 90 minutes at 150° C.;
- a net heat of combustion of ≧130,000 BTU/gallon according to ASTM D240;
- and a cetane index of ≧40.
A process for manufacturing and transporting a distillate fuel comprising:
- a) converting a hydrocarbonaceous asset into syngas at a remote site;
- b) converting at least a portion of the syngas to provide a Fischer-Tropsch derived product;
- c) blending the Fischer-Tropsch derived product with a petroleum derived component to provide a blend;
- d) hydrocracking the blend;
- e) recovering a distillate fuel comprising:
- i. ≧2 weight % aromatics;
- ii. ≧0.1 weight % oxygenates;
- iii. ≦10 ppm sulfur;
- and
- iv. ≦10 ppm nitrogen;
- wherein the distillate fuel has a stability of ≧65% according to ASTM D6468 when measured after 90 minutes at 150° C. and a cetane index of ≧40;
- f) transporting the distillate fuel to a developed site, and
- g) unloading the distillate fuel at the developed site.
Dependencies are inferred from the claim text.