A Computationally Efficient Approach to Applying the SAFT Equation for CO_2 + H_2O Phase Equilibrium Calculations

摘要

The statistical associating fluid theory equation of state (EoS) is employed in a time efficient way for the correlation and prediction of vapor–liquid equilibrium of the CO_2 + H_2O binary system for the temperature (10–100 °C) and pressure (1–600 bar) ranges suitable for simulation of CO_2 geologic sequestration. The effective number of segments and energy parameter are correlated with the reduced temperature. Simple mixing rules are applied to obtain binary interaction parameters. Assigning a fixed H_2O composition in the mixing rule makes the phase equilibrium calculations relatively fast compared to other EoS's. The results obtained by the model used were found to be in satisfactory agreement with the literature data.