## Abstract

The three-parameter cubic equation of state with one parameter temperature-dependent (3P1T), P = RT/(V - b) - a(T)/[V(V + c) + b(3V + c)], recently developed for asymmetric mixture density calculations for nonpolar substances (Yu and Lu, 1987), has been applied to VLE calculations. The binary interaction parameter k_{12} obtained from the conventional random VDW mixing rule for the mixture parameter a has been used for the prediction of volumes of saturated liquid (V^{ℓ}) and saturated vapor (V^{ν}) at the conditions of the VLE data. The 3P1T equation is as capable for VLE calculations as the Soave-Redlich-Kwong, the Peng-Robinson, the Schmidt-Wenzel and the translated Peng-Robinson equations, but it yields lower V^{ℓ} deviations than these equations. The improvement is more evident for highly asymmetric mixtures. The suitability of the form of the equation for representing V^{ℓ} of nonpolar compounds over a wide range of molecular weight is further demonstrated.

Original language | English |
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Pages (from-to) | 207-222 |

Number of pages | 16 |

Journal | Fluid Phase Equilibria |

Volume | 37 |

Issue number | C |

DOIs | |

Publication status | Published - 1987 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- Chemical Engineering(all)
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry