What is Bureau of Mines Correlation Index?

Answer 1

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).