0
chemical information is often desirable and can be supplied by means of the correlation
index (CI).
The correlation index, developed by the US Bureau of Mines, is based on the
plot of specific gravity versus the reciprocal of the boiling point in degrees Kelvin
(K = 0C + 273). For pure hydrocarbons, the line described by the constants of
the individual members of the normal paraffin series is given a value of CI = 0
and a parallel line passing through the point for the values of benzene is given as
CI = 100 (Fig. 3.5); thus,
CI = 473.7J - 456.8 + 48, 640/K
where K for a petroleum fraction is the average boiling point determined by the
standard Bureau of Mines distillation method and d is the specific gravity (Gruse
and Stevens, 1960).
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