Carbon Dioxide Influence on water dew point curves of mixtures containing methane or ethane or a synthetic natural gas.
Dew points have been measured for two binary carbon dioxide + water between 1.2x105 Pa and 30.6x105 Pa in the temperature range from 251.9 K to 288.2 K, four ternary methane + carbon dioxide + water between 1.1x105 Pa and 31.6x105 Pa in the temperature range from 248.5 K to 288.1 K, four ternary ethane + carbon dioxide + water between 1.1x105 Pa and 20.3x105 Pa in the temperature range from 252.2 K to 288.4 K and three multicomponent mixtures; one synthetic natural gas (SNG) from 1.2x105 Pa to 60.2x105 Pa in the temperature range between 213.6 K and 252.2 K and two SNG + water from 1.1x105 Pa to 40.9x105 Pa in the temperature range between 246.1 K and 288.1 K.
The results were analysed in terms of a predictive excess function - equation of state (EF-EOS) method based on the zeroth-approximation of Guggenheim's reticular model. This method has been chosen because can be used to adequately predict the dew points of the all mixtures of our interest in the dew temperature and pressure ranges. In fact, the model reproduces the experimental dew-point temperature data within average absolute deviation (AAD) between 0.1 and 2.1 K.
The results obtained for the studied mixtures with water mole fraction lower than 0.00174, at pressures higher than 5 x 105 Pa were also compared to a predictive equation of state (EOS) model. It reproduced experimental dew-point temperature data within AAD between 0.2 and 5.3 K.