Synthetic diesel fuel and process for its production
AssigneeExxon Research & Engineering Co.
InventorsRobert Jay Wittenbrink, Richard Frank Bauman, Paul Joseph Berlowitz, Bruce Randall Cook
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Abstract
Diesel fuels or blending stocks having excellent lubricity, oxidative stability and high cetane number are produced from non-shifting Fischer-Tropsch processes by separating the Fischer-Tropsch product into a lighter and heavier fractions, e.g., at about 700° F., subjecting the 700° F.+fraction to hydro-treating, and combining the 700° F.+portion of the hydrotreated product with the lighter fraction that has not been hydrotreated.
Claims11
A material useful as a fuel heavier than gasoline or as a blending component for a distillate fuel comprising:
- a 250-700° F. fraction derived from a non-shifting Fischer-Tropsch catalyst process and containing
- at least 95 wt % paraffins with an iso to normal ratio of about 0.3 to 3.0,
- <50 ppm (wt) of sulfur and nitrogen
- less than about 2 wt % unsaturates, and
- about 0.001 to less than 0.3 wt % oxygen.
wt A blended fuel, useful as a diesel fuel, comprising:
- (a) a 250-700° F. distillate fraction derived from the Fischer-Tropsch process which contains;
- at least 95 wt % paraffins with an iso to normal ratio of about 0.3 to 3.0,
- <50 ppm (wt) each of sulfur and nitrogen,
- less than about 2 wt % unsaturates
- about 0.001 to less than 0.3 wt% linear oxygenate, as oxygen on a water free basis, blended with
- (b) a petroleum derived hydrocarbon fraction, wherein the Fischer-Tropsch fraction comprises at least 10% of the blended fuel.
Dependencies are inferred from the claim text.