| 摘要 |
PROBLEM TO BE SOLVED: To provide an unleaded gasoline which is excellent in cleaning property of interior of an engine and reducing CO and THC contents in exhaust gas. SOLUTION: The unleaded gasoline is obtained by compounding 2-40 vol.% gasoline base material, 0.5-10.0 vol.% ethanol (EtOH), and 0.5-15.0 vol.% ethyl tertiary butylether (ETBT), wherein the gasoline base material is obtained from a catalytically reformed gasoline which has a polycyclic aromatic content index Y represented by a definite formula of≤20 and is obtained by a catalytic reforming treatment of a desulfurized heavy naphtha fraction having definite properties which is obtained by a desulfurization treatment of a heavy straight-run naphtha having definite properties. The unleaded gasoline has a definite research octane number, a definite motor octane number, a definite 50 vol.% distillation temperature, a definite 90 vol.% distillation temperature and a definite Reid vapor pressure. COPYRIGHT: (C)2007,JPO&INPIT
|
