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UPSC Chemistry

Nidhi T.

05/07/2017 0 0

What is correlation index in petroleum analysis ? How is it useful for classification of petroleum ?

For pure hydrocarbons,the normal paraffin series is given value of CI=0 and for benzene CI = 100.

CI= 473.7d - 456.8 + 48,640/T_K

Where, T_K for a petroleum fraction is the average boiling point (K) and ‘d’ is the specific gravity

CI Values between 0 and 15 : indicates a predominance of paraffin hydrocarbons in the fraction.
CI Values 15 to 50 : indicates predominance of either naphthenes or of mixtures of paraffins, naphthenes, and aromatics.
CI values more than 50 : indicates a predominance of aromatic species.

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