Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Natural gas is gaseous fossil fuel consisting primarily of methane (CH4). Argon(Ar) is a precious gas resource among the non-hydrocarbons in the natural gas, and it can be separated from the natural gas, thus it is very necessary to understand the vapor-liquid equilibrium (VLE) of (Ar + CH4). The investigation on the VLE data of (Ar + CH4) mostly focused on the temperature range of (greater than 140 K), while it is relatively scarce below 140 K. In this work, the VLE data of (Ar + CH4) from 95 K to 135 K were measured by experiment. Four different mixing rules (HV, MHV1, MHV2 and LCVM) with the same equation of state (PR), and the four equations of state (SRK, PR, PRSV, NM) with the same mixing rule (MHV1) were used to correlate the VLE of (Ar + CH4), respectively. The research results were discussed in detailed. In addition, the excess Gibbs free energy of (Ar + CH4) was further analyzed. The results showed that the excess Gibbs free energy of (Ar + CH4) was more than zero, and the excess Gibbs free energy and excess enthalpy curves of (Ar + CH4) had good symmetry.