Calculation of the Phase Equilibrium of CO 2 –Hydrocarbon Binary Mixtures by PR-BM EOS and PR EOS

摘要: The phase equilibrium data of CO2–hydrocarbon binary mixtures are important for the design and operation CO2 flooding, coal liquefaction, supercritical extraction processes. Numerous pieces have been obtained. Thus, models accurate calculation multicomponent must be developed on basis existing data. In this work, 3578 vapor–liquid points 10 mixtures, including CO2–butane, CO2–pentane, CO2–isopentane, CO2–hexane, CO2–benzene, CO2–heptane, CO2–octane, CO2–nonane, CO2–decane, CO2–undecane, were collected. PR PR-BM equations state (EOS) in combination with relevant mixing rules used to calculate mixtures. interaction parameter kij EOS was temperature independent, whereas parameters functions temperature. other thermodynamic properties at different temperatures pressures can calculated by using obtained work. performed better than EOS, average absolute deviations over range 255.98–408.15 K less 5.74% 3.36%, respectively. results two compared those models, such as PPR78, PR + LCVM + UNIFAC, KIE + PR EOS + HV, PSRK. CO2–butane–decane, CO2–hexane–decane, CO2–octane–decane ternary EOS. overall mole fractions 7.66%.