Solubilities of Hydrogen, Nitrogen and Carbon Dioxide in the Eutectic Mixture of Diphenylmethane and Biphenyl

In this study, the solubilities of hydrogen (H₂), nitrogen (N₂), and carbon dioxide (CO₂) in the eutectic mixture of diphenylmethane (1) and biphenyl (2) with mass fraction w₁ = 0.64947 were determined by the isochoric saturation method at pressures ranging from 0.918 MPa to 6.208 MPa, and temperatures ranging from 293 K to 363 K. The results indicate that the solubilities of the gases in the eutectic mixture follow the order CO₂ > H₂ ≈ N₂. The gas solubility data were correlated using the Krichevsky-Kasarnovsky (K-K) equation. The absolute average relative deviations (AADs) of the experimental values from the calculated data for the H₂ + eutectic mixture, N₂ + eutectic mixture, and CO₂ + eutectic mixture systems were 1.98 %, 1.74 %, and 1.74 %, respectively. Henry’s constants for the dissolution of the three gases in the eutectic mixture at different temperatures were calculated. Finally, thermodynamic parameters (the solution enthalpy, solution Gibbs free energy, solution entropy, and solution specific heat capacity) were calculated and discussed.