Reformulated diesel fuel
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsHiramie T. McAdams, Robert W. Crawford, Gerald R. Hadder, Barry D. McNutt
Life of this patent
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Abstract
Reformulated diesel fuels for automotive diesel engines which meet the requirements of ASTM 975-02 and provide significantly reduced emissions of nitrogen oxides (NOx) and particulate matter (PM) relative to commercially available diesel fuels.
Claims56
A reformulated oxygenated diesel fuel for automotive diesel engines, said reformulated diesel fuel meeting the requirements of ASTM 975-02 and having:
- a) a total cetane number in a range from about 48 to about 75;
- b) a cetane improvement number of less than or equal to 20;
- c) a minimum aromatics content (Arommin) determined as a function of said total cetane number (TCet) by the formula:
- Arommin=15.00−0.7143*[min(55,TCet)−48];
- d) a maximum aromatics content (Arommax) determined as a function of said total cetane number (TCet) by the formula:
- Arommax=−134.28+5.168*TCet−0.04051*TCet2;
- e) a sulfur content less than or equal to 500 ppm;
- and
- f) an oxygen content in a range of from greater than zero to less than or equal to 1.0 weight percent.
A reformulated oxygenated diesel fuel for automotive diesel engines, said reformulated diesel fuel meeting the requirements of ASTM 975-02 and having:
- a) a total cetane number in a range from about 48 to about 75;
- b) a cetane improvement number of less than or equal to 20;
- c) a minimum aromatics content (Arommin) determined as a function of said total cetane number (TCet) by the formula:
- Arommin=15.00−0.7143*[min(55,TCet)−48];
- d) a maximum aromatics content (Arommax) determined as a function of said total cetane number (TCet) by the formula:
- Arommax=−171.68+6.139*TCet−0.04641*TCet2;
- e) a sulfur content less than or equal to 500 ppm;
- and
- f) an oxygen content in a range of from greater than 1.0 to 2.0 weight percent.
A reformulated oxygenated diesel fuel for automotive diesel engines, said reformulated diesel fuel meeting the requirements of ASTM 975-02 and having:
- a) a total cetane number in a range from about 49 to about 75;
- b) a cetane improvement number of less than or equal to 20;
- c) a minimum aromatics content (Arommin) determined as a function of said total cetane number (TCet) by the formula:
- Arommin=14.50−0.7500*[min(55,TCet)−49];
- d) a maximum aromatics content (Arommax) determined as a function of said total cetane number (TCet) by the formula:
- Arommax=−163.37+5.687*TCet−0.04200*TCet2;
- e) a sulfur content less than or equal to 500 ppm;
- and
- f) an oxygen content in a range of from greater than 2.0 to 3.0 weight percent.
A reformulated oxygenated diesel fuel for automotive diesel engines, said reformulated diesel fuel meeting the requirements of ASTM 975-02 and having:
- a) a total cetane number in a range from about 52 to about 75;
- b) a cetane improvement number of less than or equal to 20;
- c) a minimum aromatics content (Arommin) greater than or equal to 10 volume percent;
- d) a maximum aromatics content (Arommax) determined as a function of said total cetane number (TCet) by the formula:
- Arommax=−178.25+5.930*TCet−0.04270*TCet2;
- e) a sulfur content less than or equal to 500 ppm;
- and
- f) an oxygen content in a range of from greater than 3.0 to 3.5 weight percent.
Dependencies are inferred from the claim text.