Excess enthalpies of gaseous mixtures containing ammonia 2. (Ammonia + nitrogen) and (ammonia + methane)

Abstract

The excess molar enthalpy H m E of two binary gaseous mixtures containing ammonia has been determined as a function of temperature and pressure, over the whole range of compositions. H m E of (ammonia + nitrogen) has been measured at temperatures of 313.15 K (and at pressures p = 0.81 and 1.11 MPa) and 333.15 K ( p = 0.81 and 1.42 MPa), whereas H m E of (ammonia + methane) at temperatures of 313.15 K ( p = 0.81, 1.11, and 1.42 MPa) and 333.15 K ( p = 0.81, 1.11, and 1.42 MPa). The excess molar heat capacities C p,m E, the excess molar isothermal Joule-Thomson coefficients Φ m E, and their variations with temperature and pressure have been calculated. The results are compared with those for (ammonia + argon) reported previously. (1)