A Corresponding States equation for saturated liquid densities. II. Applications to the calculation of swelling factors of CO₂—crude oil systems

Abstract

Abstract In an earlier article, a Corresponding States Method was presented for predicting the saturated liquid densities of both pure components and mixtures. The method is based on the known saturated liquid densities of two reference fluids and requires the critical properties and acentric factors of the pure components as input parameters. We use the method here to calculate the swelling factors of CO 2 ‐crude oil mixtures using CO 2 and n ‐dodecane as the reference fluids. The critical properties and acentric factors of the crude oils were estimated from their API gravities and Watson K‐factors. Using only one adjustable coefficient to characterize each CO 2 ‐crude oil system, swelling factors were calculated to within 0.5% of their experimental values. The single, adjustable coefficient is linearly related to the boiling point of the crude.