### Abstract

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

Pages | 906-915 |

Number of pages | 10 |

Journal | AIChE Journal |

Volume | 45 |

Issue number | 4 |

DOIs | |

Publication status | Published - Apr 1999 |

### Fingerprint

### Keywords

- renormalization-group
- vapor-pressures
- critical region
- simple fluids
- state
- model

### Cite this

*AIChE Journal*,

*45*(4), 906-915. https://doi.org/10.1002/aic.690450421

}

*AIChE Journal*, vol. 45, no. 4, pp. 906-915. https://doi.org/10.1002/aic.690450421

**Improving cubic EOSs near the critical point by a phase-space cell approximation.** / Fornasiero, F.; Lue, L.; Bertucco, A.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Improving cubic EOSs near the critical point by a phase-space cell approximation

AU - Fornasiero, F.

AU - Lue, L.

AU - Bertucco, A.

N1 - English Article 185TL AICHE J

PY - 1999/4

Y1 - 1999/4

N2 - Cubic equations of state (EOSs) are widely used to model the thermodynamic properties of pure fluids and mixtures. However, because they fail to account for the long-range fluctuations existing in a fluid near the critical point, they do not accurately predict the fluid properties in the critical region. Recently, an approximate renormalization group method was developed that can account for these fluctuations.A similar method is applied to provide corrections to a generalized cubic EOS for pure fluids, which is able to represent all classic cubic EOSs. The proposed approach requires two additional parameters:<(c)over bar(RG)> and Delta. The value of <(c)over bar(RG)> is correlated to experimental critical compressibility data, while Delta is set equal to 1. The method is applied to predict the saturated liquid density of fluids of different polarity, and the corrections to the original EOS are found to significantly improve the predictions of this property both far from and close to the critical point. Finally,a correlation is presented for the direct evaluation of the parameter<(c)over bar(RG)> from the value of the critical compressibility factor.

AB - Cubic equations of state (EOSs) are widely used to model the thermodynamic properties of pure fluids and mixtures. However, because they fail to account for the long-range fluctuations existing in a fluid near the critical point, they do not accurately predict the fluid properties in the critical region. Recently, an approximate renormalization group method was developed that can account for these fluctuations.A similar method is applied to provide corrections to a generalized cubic EOS for pure fluids, which is able to represent all classic cubic EOSs. The proposed approach requires two additional parameters:<(c)over bar(RG)> and Delta. The value of <(c)over bar(RG)> is correlated to experimental critical compressibility data, while Delta is set equal to 1. The method is applied to predict the saturated liquid density of fluids of different polarity, and the corrections to the original EOS are found to significantly improve the predictions of this property both far from and close to the critical point. Finally,a correlation is presented for the direct evaluation of the parameter<(c)over bar(RG)> from the value of the critical compressibility factor.

KW - renormalization-group

KW - vapor-pressures

KW - critical region

KW - simple fluids

KW - state

KW - model

U2 - 10.1002/aic.690450421

DO - 10.1002/aic.690450421

M3 - Article

VL - 45

SP - 906

EP - 915

JO - AIChE Journal

T2 - AIChE Journal

JF - AIChE Journal

SN - 0001-1541

IS - 4

ER -