Modeling phase equilibria for acid gas mixtures using the CPA equation of state. Part IV. Applications to mixtures of CO2 with alkanes

摘要: Abstract The thermodynamic properties of pure gaseous, liquid or supercritical CO 2 and mixtures with hydrocarbons other compounds such as water, alcohols, glycols are very important in many processes the oil gas industry. Design requires use accurate models, capable predicting complex phase behavior multicomponent well their volumetric properties. In this direction, over last several years, cubic-plus-association (CPA) model has been successfully used for describing interest purpose work is to evaluate performance CPA –alkane mixtures. calculations were performed using different association schemes . Firstly, was treated non-associating fluid and, at a second level, self associating fluid, 2B, 3B 4C schemes. A systematic investigation correlating performed. Mixtures alkanes up n -hexatriacontane ( n- C 36 ) investigated corresponding binary interaction parameters estimated all modeling approaches previously available eicosane 20 new have heavier based on DIPPR correlations. correlations compared literature experimental data three heavy satisfactory agreement observed. discussed including trends chain length comparison studies.