Page 321 - Characterization and Properties of Petroleum Fractions - M.R. Riazi

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7. APPLICATIONS: ESTIMATION OF THERMOPHYSICAL PROPERTIES 301

FIG. 7.1—Effect of temperature on the liquid specific gravity of hydrocarbons. Units
◦
conversion: F = ( C) × 1.8 + 32. Taken with permission from Ref. [8].
◦
values more accurate than SRK or PR equations without vol- and petroleum fractions. These methods are also applicable to
ume translation. The Lee–Kesler correlation is particularly nonhydrocarbons as well. At low pressures or when the pres-
useful for rapid-hand calculations for a single data point. sure is near saturation pressure, no correction on the effect of
The most accurate method for prediction of saturated liq- pressure is required and saturated liquid density calculated
uid densities is through Rackett equation introduced in Sec- from Rackett equation may be directly used as the density of
tions 5.8. However, for high-pressure liquids the method of compressed (subcooled) liquid at pressure of interest.
API (Eq. 5.129) or the COSTALD correlation (Eq. 5.130) For liquid mixtures with known composition, density can
may be used combined with the Rackett equation to pro- be accurately calculated from density of each component
vide very accurate density values for both pure components (or pseudocomponents) through Eq. (7.2) when it is applied

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