Cetane Number – experimental, CI – ASTM 4357 calculated from Sp Gravity, 10, 50, 90 % recovery temperature.
Diesel index = (Aniline point in 0F * API)/100
Diesel Index = (Cetane Number – 10)/0.72
Aniline point is the lowest temperature at which the oil is completely miscible with an equal volume of aniline – high aniline point indicates presence of Paraffinic components and hence better diesel index.
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