UNLEADED HIGH OCTANE NUMBER GASOLINE

摘要

PROBLEM TO BE SOLVED: To provide an unleaded high octane number gasoline capable of collectively suppressing the inlet valve deposit, combustion chamber deposit and injector deposit of a gasoline engine while preventing lightening of gasoline or decrease in a gasoline yield by using a heavy fraction as a high octane number base material compared to conventional technology. SOLUTION: The unleaded high octane number gasoline satisfies the following aspects: the gasoline has (1) a research octane number of from 95 to 105; (2) a motor octane number of from 83 to 92; (3) a sulfur content of at most 10 mass ppm; (4) a 90 vol% distillation temperature of from 130 to 180; (5) a bottom oil amount at 130°C of from 10 to 35 vol%; and (6) an amount of polycyclic aromatic groups having three or more rings of at most 100 mass ppm; and contains (7) a cleaning agent by from 10 to 500 volume ppm; (8) ethyl tertiary-butyl ether by from 1 to 15 vol%; and (9) ethanol by from 0.1 to 10 vol%. COPYRIGHT: (C)2009,JPO&INPIT