COSTALD method

The Corresponding States Liquid Density model (COSTALD) was developed to accurately predict the liquid densities of liquid natural gas. It is a corresponding states model and is 98.8 % accurate in predicting the densities of light hydrocarbon mixtures.

This model uses two characteristic parameters for each pure component in the mixture - a characteristic volume, V*, and a tuned acentric factor, wSRK. The acentric factor is chosen such that the Soave-Redlich-Kwong (SRK) equation of state best matches the vapor pressure data. Typically, this tuned acentric factor varies little in value from the standard acentric factor. See SRK — Soave-Redlich-Kwong equation of state for more information.