High-pressure vapor-liquid equilibria in the nitrogen + n-hexane system

In this work, new vapor-liquid equilibrium data for the N₂ + C₆H₁₄ system were experimentally measured over a wide temperature range from (344 to 488) K and pressures up to 50 MPa. A static-analytical apparatus with visual sapphire windows and pneumatic capillary samplers was used during the experimental measurements. Equilibrium phase compositions and vapor-liquid equilibrium ratios are reported. The new results were compared with those reported by other authors. The comparison showed that the pressure-composition data reported in this work are in good agreement with those determined by others but they lie closer to the mixture critical point at each temperature level. The experimental data were modeled with the PR and PC-SAFT equations of state by using one-fluid mixing rules and a single temperature-independent interaction parameter. Results from the modeling effort showed that the PC-SAFT equation was superior to the PR equation in correlating the experimental data of the N₂ + C₆H₁₄ system.