Prediction of the Binary Interaction Parameter of Carbon Dioxide/Alkanes Mixtures in the Pseudocritical Region

Abstract

The interaction parameters between two components need to be first determined to obtain the thermophysical properties of the binary mixtures. In this paper, the research progresses of the binary interaction parameter for CO2 and hydrocarbons (HCs) and their related mixtures are illustrated. Aiming at the physical property prediction of CO2/alkanes (C1-C10) binary mixtures in pseudocritical regions, the experimental data of CO2/alkanes (C1-C10) in the pseudocritical region available in the open literature are collected. Besides, the calculation of kij is carried out by five typically accepted correlations selected from the literature. The effects of temperature, pressure, carbon number, and acentric factor on kij are investigated. By researching the influence of the above five factors on kij, it reveals that temperature is the most important one. Considering the influence of the critical temperatures of mixtures, a simple correlation is proposed to evaluate kij for light HC mixtures in the pseudocritical region.