| 摘要 |
PROBLEM TO BE SOLVED: To provide lead-free gasoline decreasing photochemical reactivity and harmfulness of evaporated gas by decreasing ozone productivity of evaporated gas exhausted from automobiles and decreasing benzene amount in the evaporated gas. SOLUTION: The lead-free gasoline has 64-130 evaporated gas ozone productivity index X represented by X=Σ(C<SB>i</SB>×MIR<SB>i</SB>)+1.6×PVP [wherein, C<SB>i</SB>is weight concentration (wt.%) of the component i of 2-6C olefinic hydrocarbons or diolefin-based hydrocarbons; MIR<SB>i</SB>is MIR value (gO<SB>3</SB>/gNMOG) of the component i of 2-6C olefinic hydrocarbons or diolefin-based hydrocarbons; and RVP is vapor pressure (kPa) of lead-free gasoline and is expressed by the formula 40≤RVP≤100] and≤2.5 harmfulness index Y represented by Y=BZ×(0.0715×RVP-1.045) [wherein, BZ is benzene weight concentration (wt.%)]. COPYRIGHT: (C)2005,JPO&NCIPI
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