Generalized rackett-type correlations to predict the density of saturated liquids and petroleum fractions

Two new generalized correlations for the prediction of saturated liquid densities at temperatures between the triple point and the critical point are presented. The correlations use pure component parameters which are commonly available: the critical properties, the molecular weight, and the normal boiling temperature. The correlations have been tested for many substances including polar and non-polar fluids, and organic and inorganic compounds. Results are compared to predictions by other generalized correlations and to experimental data from the literature. The proposed equations predict the density of saturated liquids within 3% deviation for most fluids and with a maximum deviation of 5%. This accuracy is better than that obtained with other available generalized correlations. Another advantage of the new correlations is that they are generalized in terms of pure component properties readily available in the literature for most substances. It is also shown than the proposed correlations give good predictions of liquid density of petroleum fractions.