Full text loading...
-
Developments in SAFT EOS for Carbon Capture and Storage (CSS)
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fourth EAGE CO2 Geological Storage Workshop, Apr 2014, cp-389-00019
- ISBN: 978-90-73834-79-8
Abstract
The fluid mixtures involving in the different stages of a Carbon Capture and Storage (CSS) project can be categorized as associate electrolyte solutions. Due to highly non-ideal intermolecular interactions, investigation of phase equilibria of such fluids is one of the challenging engineering tasks of the last decade. The SAFT type equations of state is one promising approach that can account for different intermolecular non-ideality such as association, polarity and chain forming. In this study a modified version of SAFT Equation of State (EoS), SAFT1-RPM, is utilized to calculate the vapor - liquid equilibrium (VLE) of CH4-CO2-H2O-NaCl mixtures. SAFT1-RPM is chosen because of its accuracy and predictive capabilities in modeling of associating electrolyte fluids. Molecular parameters for binary sub-systems were regressed from experimental data. The model predictions at 25°C show that, adding CH4, even in a small percentage, will reduce the solubility of CO2 in the water in a same way as NaCl reduce the solubility.