Abstract
The compressibility isotherms of two samples of simulated natural gases containing, respectively, 88% and 80% methane have been measured at 298.15 and 323.15 K and pressures up to 160 bar by using a Burnett apparatus. The experimental data for the compressibility factor are compared with values calculated by the recently developed truncated virial equation of state for multicomponent gas mixtures for which the appropriate parameters were previously evaluated from experimental {ital pVT} data of pure gases and binary and ternary gas mixtures. It is found that the virial equation of state is capable of predicting the compressibilities of natural gases within 0.1% of the experimental values, provided the density and the composition are within the applicability range of the fitted parameters.
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