Repeat Example 8.17 for the Peng–Robinson equation with values of the binary interaction parameter, k12 of 0.025, 0.05, and 0.10.

Example 8.17

The following data are available for vapor–liquid equilibrium of the methane (1) –n-pentane (2) binary system at 37.78°C. Compare how well the van der Waals and Peng–Robinson equations can represent these data using the equation of state method to calculate fugacity coeffi cients of the vapor and the liquid.

Transcribed Image Text:

P [bar] 13.82 27.68 41.45 55.26 69.08 86.35 103.62 120.89 138.16 155.43 172.70 0.849 0.8954 0.9322 0.9422 0.9486 0.9494 0.9483 0.9421 0.9296 0.9128 0.889 0.0646 0.1293 0.1892 0.2453 0.2965 0.3565 0.4152 0.4782 0.5509 0.635 0.735 y X1