### Abstract

Language | English |
---|---|

Pages | 1455-1466 |

Number of pages | 12 |

Journal | AIChE Journal |

Volume | 44 |

Issue number | 6 |

DOIs | |

Publication status | Published - Jun 1998 |

### Fingerprint

### Keywords

- vapor-liquid-equilibrium
- carbon-dioxide
- renormalization- group
- normal-butane
- n-butane
- statistical mechanics
- differential approach
- low-temperatures
- critical-points
- mode expansion

### Cite this

*AIChE Journal*,

*44*(6), 1455-1466. https://doi.org/10.1002/aic.690440622

}

*AIChE Journal*, vol. 44, no. 6, pp. 1455-1466. https://doi.org/10.1002/aic.690440622

**Thermodynamics of fluid mixtures near to and far from the critical region.** / Lue, L.; Prausnitz, J. M.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Thermodynamics of fluid mixtures near to and far from the critical region

AU - Lue, L.

AU - Prausnitz, J. M.

N1 - English Article ZT298 AICHE J

PY - 1998/6

Y1 - 1998/6

N2 - A theory for an equation of state for simple fluid mixtures valid both near to and far from critical points is presented. The base equation of state obtained from integral-equation theory using the mean-spherical approximation is used to compute the contribution of short-wavelength fluctuations to the free energy of the fluid mixture. Wilson's phase-space cell approximation, as extended by White, is used to compute the contribution of long-wavelength fluctuations.The resulting theory possesses nonclassic critical exponents similar to those observed experimentally. Far from the critical region, where long-wavelength fluctuations are not important, the theory reduces to that corresponding to the base equation of state. The complete theory is used to represent the thermodynamic properties and phase behavior of binary mixtures of methane, carbon dioxide and n-butane.In the critical region, agreement with experiment is dramatically improved upon, adding to the base equation of state corrections from long-wavelength fluctuations.

AB - A theory for an equation of state for simple fluid mixtures valid both near to and far from critical points is presented. The base equation of state obtained from integral-equation theory using the mean-spherical approximation is used to compute the contribution of short-wavelength fluctuations to the free energy of the fluid mixture. Wilson's phase-space cell approximation, as extended by White, is used to compute the contribution of long-wavelength fluctuations.The resulting theory possesses nonclassic critical exponents similar to those observed experimentally. Far from the critical region, where long-wavelength fluctuations are not important, the theory reduces to that corresponding to the base equation of state. The complete theory is used to represent the thermodynamic properties and phase behavior of binary mixtures of methane, carbon dioxide and n-butane.In the critical region, agreement with experiment is dramatically improved upon, adding to the base equation of state corrections from long-wavelength fluctuations.

KW - vapor-liquid-equilibrium

KW - carbon-dioxide

KW - renormalization- group

KW - normal-butane

KW - n-butane

KW - statistical mechanics

KW - differential approach

KW - low-temperatures

KW - critical-points

KW - mode expansion

U2 - 10.1002/aic.690440622

DO - 10.1002/aic.690440622

M3 - Article

VL - 44

SP - 1455

EP - 1466

JO - AIChE Journal

T2 - AIChE Journal

JF - AIChE Journal

SN - 0001-1541

IS - 6

ER -