Application of SAFT equation for CO2 + H2O phase equilibrium calculations over a wide temperature and pressure range

The statistical associating fluid theory (SAFT) equation of state is employed for the correlation and prediction of vapor–liquid equilibrium of CO2 + H2O binary system for a wide temperature (10–300 °C) and pressure (1–600 bar) range. To make the equation applicable for these temperatures and pressure ranges, effective numbers of segments and energy parameters have been co-related with reduced temperature and pressure. Simple mixing rules have been applied to obtain binary interaction parameter. The results were found to be in satisfactory agreement with the literature data except in fully miscible regions.

► SAFT model is employed for a temperature range 10–300 °C and pressure range 1–600 bar.
► Simple mixing rule is applied.
► Required parameters are estimated.
► Calculated results are compared with experimental data.