Lead-free, high-octane gasoline
AssigneeNippon Oil Co., Ltd.
InventorsTakashi Kaneko, Jun Akimoto, Tatsuo Omata
Life of this patent
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Abstract
Lead-free, high-octane gasolines are made up of a selected class of C.sub.5 -paraffinic and C.sub.6 -hydrocarbons and a methyl-t-butylether compound (MTBE) such that they have specified physical properties of research octane numbers, Reid vapor pressures, densities at 15.degree. C. and sulfur contents and also have blended specified amounts of the MTBE compound and of those hydrocarbons to satisfy the requirements as determined by several specified equations. Startability of a cold automobile engine is conspicuously improved and emission of NOx reduced.
Claims7
A lead-free, high-octane gasoline comprising a C.sub.5 -hydrocarbon, a C.sub.6 -hydrocarbon and a methyl-t-butylether compound (MTBE) and having a research octane number of not less than 98.0, a Reid vapor pressure of 0.40 to 0.95 kgf/cm.sup.2, a density of 0.735 to 0.755 g/cm.sup.3 at 15.degree. C. and a sulfur content of not more than 50 ppm by weight, the gasoline meeting with the requirements of equations (1) to (5);
- 3.ltoreq.V(M).ltoreq.15 (1)
- (a)17.ltoreq.V(C.sub.5).ltoreq.20 in the case of 0.40.ltoreq.Rv<0.65 (2)
- (b)18.ltoreq.(C.sub.5).ltoreq.25 in the case of 0.65.ltoreq.Rv.ltoreq.0.70 and
- (c)20.ltoreq.V(C.sub.5).ltoreq.35 in the case of 0.70.ltoreq.Rv.ltoreq.0.95
- 15.ltoreq.V(C.sub.6).ltoreq.30 (3)
- 0.55.ltoreq.V(C.sub.5p)/V(C.sub.5).ltoreq.0.90;
- and (4)
- 11.5+0.1.times.V(M).ltoreq.V(C.sub.5p) (5)
- where V(M) is the amount of the MTBE compound, Rv is the Reid vapor pressure, V(C.sub.5) is the amount of the C.sub.5 -hydrocarbon, V(C.sub.6) is the amount of the C.sub.6 -hydrocarbon, and V(C.sub.5p) is the amount of the C.sub.5 -paraffinic hydrocarbon, each of the amounts being expressed by % by volume and based on the total gasoline.
Dependencies are inferred from the claim text.