Phase Equilibrium of Three Binary Mixtures Containing NO and Components Present in Ambient Air

Air contains impurities, which must be removed before its transformation and utilization. In the present work, new isothermal vapor–liquid equilibrium (VLE) data are reported for three binary systems containing NO with (CO, N2, or Ar) at different temperatures (between 105 and 146 K) and pressures up to 4 MPa. The compositions of the coexisting phases were experimentally determined using an apparatus based on the “static-analytic” method. The Peng–Robinson equation of state combined with different mixing rules (classical, Wong–Sandler, and Huron–Vidal) were used to represent the phase diagram (P, x, y).