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Dew points for two synthetic natural gas (SNG) mixtures between 1.2 × 10 5 and 81.8 × 10 5 Pa in the temperature range from 213.6 to 261.4 K, four SNG + water mixtures between 1.1 × 10 5 and 41.0 × 10 5 Pa and temperatures from 244.7 to 288.1 K, and four SNG + water + methanol mixtures between 1.1 × 10 5 and 20.7 × 10 5 Pa and temperatures from 247.6 to 288.6 K were experimentally determined. The experimental results obtained on the multicomponent systems were analyzed in terms of a predictive excess function-equation of state (EF-EOS) method, which reproduced experimental dew point temperature data with absolute average deviation (AAD) between 0.9 and 3.1 K for the dry systems, from 0.0 to 1.6 K for the systems with water, and from 0.0 to 3.0 K for the systems with water and methanol. The experimental results obtained for synthetic natural gas (SNG) + water mixtures at pressure values higher than 5 × 10 5 Pa were also compared to a predictive equation of state (EOS) model. It reproduced experimental dew point temperature data within AAD between 1.8 and 5.3 K.

Experimental measurements of dew points for seven methane + carbon dioxide + water mixtures in the pressure range of 1.1 × 10 5 -60.5 × 10 5 Pa in the temperature range of 243.1-288.1 K, and four ethane + carbon dioxide + water mixtures at pressures of 1.1 × 10 5 -20.3 × 10 5 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 × 10 5 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.