Synthetic jet fuel and process for its production
AssigneeExxon Research & Engineering Co.
InventorsRobert J. Wittenbrink, Paul J Berlowitz, Bruce R. Cook
Life of this patent
Estimating the term…
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.
Claims19
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 0.3 to 3.0,
- ≦50 ppm (wt) each of sulfur and nitrogen
- less than about 1.0 wt % unsaturates, and
- about 0.005 to less than 0.5 wt % oxygen, water free basis.
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 0.3 to 3.0,
- ≦50 ppm (wt) each of sulfur and nitrogen
- less than about 1.0 wt % unsaturates, and
- sufficient oxygen containing compounds so that the material has a lubricity of at least 34% of that of Reference Fuel 2, described in “The U.S. Army Scuffing Load Wear Test”, Lacey, P. I., Jan. 1, 1994 (“Lacey”) when measured by the Scuffing Load Ball on Cylinder Lubricity Evaluation described in Lacey.
A process for increasing the lubricity of a jet fuel containing a 250-550° F. fraction derived from a non-shifting Fischer-Tropsch process, comprising:
- adding 0.005 to 0.5 wt % oxygen, water free basis, of said fraction to said fuel in the form of oxygen containing compounds having a lipophilic end and a hydrophilic end.
Dependencies are inferred from the claim text.