Experimental Determination of Phase Envelope Data for Synthetic Natural Gas Mixtures

Phase envelope data for four synthetic natural gas mixtures have been determined using isochoric data. The characteristic of the isochoric apparatus and the procedure used for the determination of the saturation temperature and pressure data are described. A new methodology for determining saturation densities from isochoric data is proposed. Finally, the experimental results are compared to some equations of state commonly used in industry. These calculations were performed with a new computational tool developed in our research group for the determination of phase envelopes based upon Gibbs energy minimization.