### Abstract

Two thermodynamic theories, the non-random hydrogen bonding (NRHB) and the statistical associating fluid theory (SAFT) are used to model phase equilibria of pure fluids and mixtures. The scaling parameters for several non-associating as well as self-associating fluids are estimated, for both equations of state, by fitting experimental vapor pressure and saturated liquid density data over a wide temperature range. For the correlation of phase equilibria of mixtures, one binary interaction parameter is calculated for each of the systems examined. Analysis of the results shows that NRHB model is more accurate for the correlation of saturated liquid densities and vapor pressures of most pure fluids. Also, NRHB is clearly more accurate than SAFT for the correlation of phase equilibria of binary mixtures that contain one self-associating fluid, while the accuracy of the two theories is comparable for the case of non-associating mixtures.

Original language | English |
---|---|

Pages (from-to) | 19-28 |

Number of pages | 10 |

Journal | Fluid Phase Equilibria |

Volume | 253 |

Issue number | 1 |

DOIs | |

Publication status | Published - 1 Apr 2007 |

Externally published | Yes |

### Fingerprint

### Keywords

- Lattice theory
- Modeling
- NRHB
- Perturbation theory
- Phase equilibria
- SAFT

### ASJC Scopus subject areas

- Fluid Flow and Transfer Processes
- Physical and Theoretical Chemistry

### Cite this

*Fluid Phase Equilibria*,

*253*(1), 19-28. https://doi.org/10.1016/j.fluid.2007.01.008

**Modeling of fluid phase equilibria with two thermodynamic theories : Non-random hydrogen bonding (NRHB) and statistical associating fluid theory (SAFT).** / Tsivintzelis, Ioannis; Spyriouni, Theodora; Economou, Ioannis.

Research output: Contribution to journal › Article

*Fluid Phase Equilibria*, vol. 253, no. 1, pp. 19-28. https://doi.org/10.1016/j.fluid.2007.01.008

}

TY - JOUR

T1 - Modeling of fluid phase equilibria with two thermodynamic theories

T2 - Non-random hydrogen bonding (NRHB) and statistical associating fluid theory (SAFT)

AU - Tsivintzelis, Ioannis

AU - Spyriouni, Theodora

AU - Economou, Ioannis

PY - 2007/4/1

Y1 - 2007/4/1

N2 - Two thermodynamic theories, the non-random hydrogen bonding (NRHB) and the statistical associating fluid theory (SAFT) are used to model phase equilibria of pure fluids and mixtures. The scaling parameters for several non-associating as well as self-associating fluids are estimated, for both equations of state, by fitting experimental vapor pressure and saturated liquid density data over a wide temperature range. For the correlation of phase equilibria of mixtures, one binary interaction parameter is calculated for each of the systems examined. Analysis of the results shows that NRHB model is more accurate for the correlation of saturated liquid densities and vapor pressures of most pure fluids. Also, NRHB is clearly more accurate than SAFT for the correlation of phase equilibria of binary mixtures that contain one self-associating fluid, while the accuracy of the two theories is comparable for the case of non-associating mixtures.

AB - Two thermodynamic theories, the non-random hydrogen bonding (NRHB) and the statistical associating fluid theory (SAFT) are used to model phase equilibria of pure fluids and mixtures. The scaling parameters for several non-associating as well as self-associating fluids are estimated, for both equations of state, by fitting experimental vapor pressure and saturated liquid density data over a wide temperature range. For the correlation of phase equilibria of mixtures, one binary interaction parameter is calculated for each of the systems examined. Analysis of the results shows that NRHB model is more accurate for the correlation of saturated liquid densities and vapor pressures of most pure fluids. Also, NRHB is clearly more accurate than SAFT for the correlation of phase equilibria of binary mixtures that contain one self-associating fluid, while the accuracy of the two theories is comparable for the case of non-associating mixtures.

KW - Lattice theory

KW - Modeling

KW - NRHB

KW - Perturbation theory

KW - Phase equilibria

KW - SAFT

UR - http://www.scopus.com/inward/record.url?scp=33847615671&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847615671&partnerID=8YFLogxK

U2 - 10.1016/j.fluid.2007.01.008

DO - 10.1016/j.fluid.2007.01.008

M3 - Article

VL - 253

SP - 19

EP - 28

JO - Fluid Phase Equilibria

JF - Fluid Phase Equilibria

SN - 0378-3812

IS - 1

ER -