Synthetic jet fuel and process for its production (law724)
AssigneeExxonMobil Research and Engineering Company
InventorsRobert J. Wittenbrink, Paul J Berlowitz, Bruce R. Cook
Life of this patent
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Abstract
Clean distillate useful as a jet fuel or jet blending stock is produced from Fischer-Tropsch wax by separating wax into heavier and lighter fractions; further separating the lighter fraction and hydroisomerizing the heavier fraction and that portion of the light fraction above about 475° F. The isomerized product is blended with the untreated portion of the lighter fraction to produce high quality, clean, jet fuel.
Claims7
A material useful as a jet fuel or as a blending component for a jet fuel comprising:
- a 250-550° F. fraction derived from a non-shifting Fischer-Tropsch process, said material including
- at least 95 wt % paraffins with an iso to normal ratio of about 0.7 to 2.0,
- ≦50 ppm (wt) each of sulfur
- ≦20 ppm (wt) of nitrogen
- less than about 0.5 wt % unsaturates,
- ≦0.5 wt % olefins and aromatics, and
- about 0.02-0.3 wt % oxygen, water free basis.
A method for improving jet fuel freeze point by separating a 700° F.- Fischer Tropsch stream into a C5−475° F. stream, and hydroisomerizing the 475-700° F. stream.
A method for improving jet fuel lubricity by adding a blending stock with at least 10 ppm (wt) linear alcohols, on an oxygen weight basis.
Dependencies are inferred from the claim text.