### Abstract

The parameters of equations of state of van der Waals type have been generally correlated by matching the properties of pure substances, and extended to mixtures by employing mixing rules commonly with binary interaction parameters. It is proposed to use equilibrium data on binary systems to determine the attraction term in equations of state (EOS) for super critical components instead of data of pure substances. The proposed method was applied to the Peng-Robinson EOS, as an example, resulting in a significant improvement in predicting the phase behaviour of different types of fluids. As no binary interaction parameters are required in this method the computational requirement for flash calculations is drastically reduced for fluids with many components. The proposed method is particularly advantageous for predicting fluid phase equilibria in compositional reservoir simulators, where the reservoir fluid can be described with any desirable number of components without any significant increase in computational time. © 1995.

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

Pages (from-to) | 45-61 |

Number of pages | 17 |

Journal | Fluid Phase Equilibria |

Volume | 112 |

Issue number | 1 |

Publication status | Published - Nov 1995 |

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### Keywords

- Cubic
- Equation of state
- Hydrocarbons
- Mixing rules
- Super critical
- Theory
- Vapour-liquid equilibria

### Cite this

*Fluid Phase Equilibria*,

*112*(1), 45-61.

}

*Fluid Phase Equilibria*, vol. 112, no. 1, pp. 45-61.

**Improving predictions of equation of state by modifying its parameters for super critical components of hydrocarbon reservoir fluids.** / Danesh, A.; Xu, D. H.; Tehrani, D. H.; Todd, A. C.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Improving predictions of equation of state by modifying its parameters for super critical components of hydrocarbon reservoir fluids

AU - Danesh, A.

AU - Xu, D. H.

AU - Tehrani, D. H.

AU - Todd, A. C.

PY - 1995/11

Y1 - 1995/11

N2 - The parameters of equations of state of van der Waals type have been generally correlated by matching the properties of pure substances, and extended to mixtures by employing mixing rules commonly with binary interaction parameters. It is proposed to use equilibrium data on binary systems to determine the attraction term in equations of state (EOS) for super critical components instead of data of pure substances. The proposed method was applied to the Peng-Robinson EOS, as an example, resulting in a significant improvement in predicting the phase behaviour of different types of fluids. As no binary interaction parameters are required in this method the computational requirement for flash calculations is drastically reduced for fluids with many components. The proposed method is particularly advantageous for predicting fluid phase equilibria in compositional reservoir simulators, where the reservoir fluid can be described with any desirable number of components without any significant increase in computational time. © 1995.

AB - The parameters of equations of state of van der Waals type have been generally correlated by matching the properties of pure substances, and extended to mixtures by employing mixing rules commonly with binary interaction parameters. It is proposed to use equilibrium data on binary systems to determine the attraction term in equations of state (EOS) for super critical components instead of data of pure substances. The proposed method was applied to the Peng-Robinson EOS, as an example, resulting in a significant improvement in predicting the phase behaviour of different types of fluids. As no binary interaction parameters are required in this method the computational requirement for flash calculations is drastically reduced for fluids with many components. The proposed method is particularly advantageous for predicting fluid phase equilibria in compositional reservoir simulators, where the reservoir fluid can be described with any desirable number of components without any significant increase in computational time. © 1995.

KW - Cubic

KW - Equation of state

KW - Hydrocarbons

KW - Mixing rules

KW - Super critical

KW - Theory

KW - Vapour-liquid equilibria

M3 - Article

VL - 112

SP - 45

EP - 61

JO - Fluid Phase Equilibria

JF - Fluid Phase Equilibria

SN - 0378-3812

IS - 1

ER -