A thermodynamic framework for modeling semiclathrate hydrate phase stability conditions in gas + tetra‐n‐butyl ammonium halide aqueous solution system

A thermodynamic framework for modeling semiclathrate hydrate phase stability conditions in... To estimate the dissociation conditions of semiclathrate hydrates in gas + tetra‐n‐butyl ammonium halide aqueous solution systems, we introduce an extended thermodynamic framework, which was originally proposed by Javanmardi and colleagues for modeling of gas hydrate dissociation conditions in aqueous solutions of electrolytes (12 [1998] 219–222, Energy and Fuels). For evaluating the hydrate dissociation conditions, we apply the van der Waals–Platteuw theory. In addition, we incorporate the Peng–Robinson equation of state and the activity coefficient model of Pitzer and Mayorga to respectively calculate gas/vapor fugacity and tetra‐n‐butyl ammonium halide activity coefficient. Using this model, we have estimated the semiclathrate hydrate dissociation conditions in the systems of CH4, N2, or CO2 + tetra‐n‐butylammonium bromide + water; CO2 + tetra‐n‐butylammonium fluoride + water; and CH4 or CO2 + tetra‐n‐butylammonium chloride + water systems. The model results are found in satisfactory agreement with the selected experimental data collected from literature. Also, the average absolute temperature deviations for the studied systems are about 0.3 K. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Asia-Pacific Journal of Chemical Engineering Wiley

A thermodynamic framework for modeling semiclathrate hydrate phase stability conditions in gas + tetra‐n‐butyl ammonium halide aqueous solution system

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Publisher
Wiley
Copyright
Copyright © 2018 Curtin University of Technology and John Wiley & Sons, Ltd.
ISSN
1932-2135
eISSN
1932-2143
D.O.I.
10.1002/apj.2199
Publisher site
See Article on Publisher Site

Abstract

To estimate the dissociation conditions of semiclathrate hydrates in gas + tetra‐n‐butyl ammonium halide aqueous solution systems, we introduce an extended thermodynamic framework, which was originally proposed by Javanmardi and colleagues for modeling of gas hydrate dissociation conditions in aqueous solutions of electrolytes (12 [1998] 219–222, Energy and Fuels). For evaluating the hydrate dissociation conditions, we apply the van der Waals–Platteuw theory. In addition, we incorporate the Peng–Robinson equation of state and the activity coefficient model of Pitzer and Mayorga to respectively calculate gas/vapor fugacity and tetra‐n‐butyl ammonium halide activity coefficient. Using this model, we have estimated the semiclathrate hydrate dissociation conditions in the systems of CH4, N2, or CO2 + tetra‐n‐butylammonium bromide + water; CO2 + tetra‐n‐butylammonium fluoride + water; and CH4 or CO2 + tetra‐n‐butylammonium chloride + water systems. The model results are found in satisfactory agreement with the selected experimental data collected from literature. Also, the average absolute temperature deviations for the studied systems are about 0.3 K.

Journal

Asia-Pacific Journal of Chemical EngineeringWiley

Published: Jan 1, 2018

Keywords: ; ; ; ;

References

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