| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas oil composition for winter suitable for both diesel combustion and premixed compression ignition combustion. SOLUTION: The gas oil composition comprises an FT synthetic base material and has a sulfur content of not more than 5 mass ppm, an oxygen content of not more than 100 mass ppm, a bulk modulus of 1,250 to 1,450 MPa, a Saybolt color of not less than +22, a lubrication ability of not more than 400μm, an initial boiling point of not lower than 140°C, an end point of not higher than 360°C, such characteristic features that (1) the cetane number of the fraction of lower than 200°C is 20-40 and the constitution ratio of the fraction is 10-20 vol.%, (2) the cetane number of the fraction of 200°C to lower than 280°C is 30-60 and the constitution ratio of the fraction is 30-89 vol.% and (3) the cetane number of the fraction of not lower than 280°C is not more than 50 and the constitution ratio of the fraction is 1-60 vol.%, and is used in a supercharger and a diesel engine with EGR having a geometrical compression ratio of more than 16, and satisfies the JIS No.2 gas oil specifications in the quality item properties other than the sulfur content. COPYRIGHT: (C)2008,JPO&INPIT
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