Larisa N. Vapor-liquid equilibrium in systems containing carbon dioxide and organic absorbents

Experimental results on vapor-liquid equilibrium in two-component systems containing carbon dioxide and ethylene glycol (ЕG), diethylene glycol (DЕG), thriethylene glycol (TЕG) and N-methylpyrrolidone at elevated pressures in the temperature range 0-50 °С are presented. In the systems with glycols restricted solubility in the liquid state is established. СО2 - N-MP system demonstrates mutual complete solubility in the liquid state. Equilibrium liquid phase volumetric behavior for СО2 - N-MP system at temperatures 0-30 °С has been investigated. Molar liquid phase volumes isotherms have a minimum at temperatures close to the critical temperature of CO2. Concentration boundaries in the liquid state for CO2 - gamma-butyrolactone system at temperatures exceeding the critical temperature of CO2 have been determined. Exact thermodynamic equation for computing of volatile component molar partial heats of solution has been deduced. Thermodynamic characteristics of carbon dioxide: activity coefficients, solvation heats, mixing heats, excess Gibb's energies end excess entropies are computed on the basis of the obtained data.