Dew Points of Ternary Methane (or Ethane) + Carbon Dioxide + Water Mixtures:  Measurement and Correlation

Experimental measurements of dew points for seven methane + carbon dioxide + water mixtures in the pressure range of 1.1 × 105−60.5 × 105 Pa in the temperature range of 243.1−288.1 K, and four ethane + carbon dioxide + water mixtures at pressures of 1.1 × 105−20.3 × 105 Pa and temperatures of 252.2−288.4 K, were determined. The experimental results obtained on the ternary systems were analyzed in terms of a predictive excess function−equation of state (EF−EOS) method, which reproduced experimental dew-point temperature data within an absolute average deviation (AAD) of 0.1−2.1 K. The experimental results obtained for the studied mixtures at pressures of >5 × 105 Pa were also compared to a predictive equation of state (EOS) model. It reproduced experimental dew-point temperature data within AAD values of 0.9−2.1 K.