Solubility of carbon dioxide in methanol from 213.15 K to 273.15 K: Measurement and modeling

Abstract

The isothermal solubility data of carbon dioxide in methanol were measured at temperatures from 213.15 K to 273.15 K and pressures from vacuum up to 3.3450 MPa. The experimental method was a static analytical method with liquid sampling using a heated sample cylinder coupled to a gas chromatograph for analysis. The SRK EOS with the vdW one-fluid mixing rule was used to describe the equilibrium behavior of the vapor phase in the system for carbon dioxide + methanol binary mixture. The equilibrium behavior of the liquid phase was separately described by the NRTL and Wilson activity coefficient models. The measured data were separately correlated with SRK-vdW-NRTL and SRK-vdW-Wilson models. The calculated results indicate that the SRK-vdW-NRTL model predicts false liquid-liquid splitting, and the SRK-vdW-Wilson model not only matches well with the measured data but also predicts optimally VLE data of the system from 213.15 K to 273.15 K.