Solubilities of hydrogen, nitrogen, and carbon dioxide in diphenylmethane

Hydrogen (H-2), nitrogen (N-2) and carbon dioxide (CO2) solubilities were measured at the temperature (313 to 363) K and the pressure (0.809 to 6.194) MPa. The reliability of the experimental system was verified by measuring the solubilities of N-2 in dodecane and CO2 in decane at 344 K. The experimental data were fitted by empirical correlation x=(aT(2)+bT+c)(dp(2)+ep+f), and the relative deviations between the experimental value and the literature value for the solubilities at given pressure and temperature were less than +/- 5 %. Under the same temperature and pressure conditions, the solubilities of the three gases in DPM is CO2 > N-2 approximate to H-2. Krichevsky- Kasarnovsky (K-K) equation was used to fit the experimental data. The absolute average relative deviation (AAD) between the experimental data of H-2+DPM, N-2+DPM and CO2+DPM systems and the calculated values of K-K equation are 1.21 %, 1.86 % and 0.88 %, respectively. In addition, the Henry constants of three gases dissolved in DPM were calculated, and the solution enthalpy, solution entropy, solution Gibbs free energy and solution specific heat capacity were calculated. H-2 and N-2 solubilities showed to be endothermic, while CO2 showed the opposite trend.