Dew points of ternary methane+ethane+butane and quaternary methane+ethane+butane+water mixtures: measurement and correlation

Dew points for ternary methane+ethane+butane and quaternary methane+ethane+butane+water mixtures were determined experimentally between 4.77×105 and 99.45×105 Pa and at temperatures from 250.92 to 288.54 K. The experimental dew point curves of the mixtures with water were reproduced quite accurately with an excess function–equation of state method, independent of the temperature and pressure ranges.