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SAFT1-RPM approximation extended to phase equilibria and densities of CO2-H2O and CO2-H2O-NaCl systems
University of Wyoming.
University of Wyoming.
University of Wyoming.
2005 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 44, p. 8419-8427Article in journal (Refereed) Published
Abstract [en]

In SAFT1-RPM approximations of CO2-H2O and CO2-H2O-NaCl systems, relevant to oil recovery and CO2 sequestration, CO2 is modeled as a molecule with three association sites, two sites of type O and one site of type C. H2O is modeled as a molecule with four association sites, two sites of type O and two sites of type H. The salt is modeled as a molecule composed of two charged, but nonassociating, spherical segments, of which one represents the cation and one represents the anion. For the CO2-H2O system, only one type of cross-association is assigned, i.e., between the site of type O in CO2 and the site of type H in H2O. Using temperature-dependent parameters, SAFT1-RPM is found to represent the density and equilibrium data for the CO2-H2O system, including the minimum H2O concentration in the CO2-rich phase in the y-P diagram. For the CO2-H2O-NaCl system, an additional binary interaction constant is used, the same for both CO2-Na+ and CO2-Cl- pairs, which is needed to correct the short-range interactions. SAFT1-RPM is also found to represent the equilibrium and density data for the CO2-H2O-NaCl system.

Place, publisher, year, edition, pages
2005. Vol. 44, p. 8419-8427
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-9766DOI: 10.1021/ie050725hLocal ID: 8714c180-0d76-11de-9d3e-000ea68e967bOAI: oai:DiVA.org:ltu-9766DiVA, id: diva2:982704
Note
Upprättat; 2005; 20090310 (xiajix)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Ji, Xiaoyan

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