Experimental Investigation on the Solubility of Oxygen in Toluene and Acetic Acid

By using the dual vessel equilibrium method, the solubility of oxygen in toluene and acetic acid was experimentally investigated with pressure ranging from 0.1 to 1.0 MPa at temperatures from 293.1 to 383.1 K. The results show that the oxygen solubility either in toluene or in acetic acid increases with a rise in temperature. On the basis of the experimental data, Henry coefficients were derived and expressed as a function of temperature. At the same temperature, Henry coefficient for the oxygen–toluene system is lower than that for the oxygen–acetic acid system. Through analysis of the Gibbs energy (ΔG⁰), partial molar enthalpy (ΔH⁰), and the partial molar entropy (ΔS⁰) of the solvation, we can know that solubilization of oxygen either in toluene or in acetic acid is an endothermic process. To correlate the experimental data, the Peng–Robinson equation of state with the quadratic mixing rule was used for the two systems.