Abstract
This work employs the PC-SAFT equation of state to illustrate how to compute phase equilibria and stability of multiphase systems. The proposed computation scheme is based on the methodology of Gupta et al. (1991) but with modifications. Phase equilibria and stability are computed simultaneously and without the need to modify the exact stability equation. This approach does not encounter difficulty when the phase fraction approaches zero. A simple initialization strategy is utilized. In addition, this work tests the predictive capability of PC-SAFT in multiphase systems of water-hydrocarbon containing systems at different pressure-temperature conditions. The dipole and quadrupole interactions were included in the PC-SAFT equation and the binary interaction parameters (kij) were set to zero. The work has demonstrated the ability of PC-SAFT to successfully predict vapour-liquid-liquid equilibrium of systems containing water, hydrocarbons and ethylene glycol with or without carbon dioxide.
| Original language | English |
|---|---|
| Pages (from-to) | 169-178 |
| Number of pages | 10 |
| Journal | Fluid Phase Equilibria |
| Volume | 302 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - 15 Mar 2011 |
| Externally published | Yes |
Bibliographical note
Funding Information:We are grateful to the King Fahd University of Petroleum & Minerals for its support of Nayef Alsaifi in funding his graduate scholarship. Financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC) is also acknowledged.
Keywords
- Association
- Dipolar
- Ethylene glycol
- Hydrocarbon
- Multiphase calculations
- PC-SAFT
- Quadrupole
- Stability analysis
- Trust-region Gauss-Newton method
- Water
ASJC Scopus subject areas
- General Chemical Engineering
- General Physics and Astronomy
- Physical and Theoretical Chemistry