| 摘要 |
PROBLEM TO BE SOLVED: To provide an unleaded high octane number gasoline excellent in startability and operability and cleaning properties of intake valves of automobiles in consideration of the air environment. SOLUTION: The unleaded high octane number gasoline contains 1-15 vol% of ethanol (EtOH) and has (1) a research octane number of 97-105, (2) a motor octane number of 84-92, (3) a Reid vapor pressure of 45-93 kPa, (4) a 50% distillation temperature of 75-110°C, (5) a 70°C distillation amount of 18-40 vol%, (6) an aromatics content of at most 45 vol%, (7) an olefin content of at most 25 vol%, (8) a benzene content of at most 1 vol%, (9) a sulfur content of at most 10 mass ppm, and (10) a polycyclic aromatics index Y of at most 6. COPYRIGHT: (C)2007,JPO&INPIT
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