Journal
PETROLEUM SCIENCE AND TECHNOLOGY
Volume 31, Issue 19, Pages 2013-2021Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10916466.2011.559500
Keywords
carbon dioxide; gas hydrates; methane; methanol
Funding
- Persian Gulf University
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Equilibrium data for the novel formation of hydrates of carbon dioxide and mixtures of carbon dioxide and methane in 20 wt% aqueous methanol solution were measured by the constant-volume method. For CO2, these data were taken at the temperature and pressure ranges of 264.7-270.7 K and 1,470-3,160 kPa, respectively. For mixtures of carbon dioxide and methane, these data were taken at the temperature and pressure ranges of 262.9-273.7 K and 1,370-5,100 kPa, respectively. The data obtained for CO2 in 20 wt% aqueous methanol solution were in disagreement with previously published data, but there was good agreement between our data and the predictions of thermodynamic models. The Peng-Robinson equation of state (PR EOS) coupled with the Wong-Sandler (WS) mixing rule was used to obtain the fugacities of the components in the gas and aqueous liquid phases. The PR EOS was then coupled with van der Waals-Platteeuw (vdW-P) hydrate model and applied to predict hydrate-formation conditions in the system containing methanol. The model predictions demonstrated good agreement with the experimental data.
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