Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

This work reports gas solubility data and Henry s constants for carbon dioxide in pure water and ethanol and in their mixtures. For this purpose, a simple laboratory apparatus containing a glass equilibrium cell was constructed and the methodology consisted basically in injecting and storing the gas into the system at a pre-established pressure and then allow the gas dissolution. The liquid phase compositions were calculated through an iterative procedure considering the validity of Henry s law for the liquid phase fugacity of the lighter component. The experiments were performed in the temperature range of 288 323 K, up to 6 atm in pure solvents and at various ethanol water mixture compositions. From the experimental gas liquid equilibrium data, P x diagrams, excess Henry s constants as well as partial molar enthalpy and entropy of solution have been determined.