Thermodynamic modeling of the dissociation conditions of hydrogen sulfide clathrate hydrate in the presence of aqueous solution of inhibitor (alcohol,salt or ethylene glycol) |
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| Authors: | Abolfazl Mohammadi Mehrdad Manteghian Amir H Mohammadi Arash Kamran-Pirzaman |
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| Affiliation: | 1. Faculty of Engineering, University of Bojnord, Bojnord, Iran;2. Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran;3. Institut de Recherche en Génie Chimique et Pétrolier (IRGCP), Paris Cedex, France;4. Thermodynamics Research Unit, School of Chemical Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban, South Africa;5. Chemical Engineering Department, Mazandaran University of Science and Technology, Behshahr, Iran |
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| Abstract: | Hydrate dissociation conditions of hydrogen sulfide in the presence of aqueous solution of thermodynamic inhibitor (methanol, ethanol, ethylene glycol, NaCl, KCl and CaCl2) is modeled in this communication. A thermodynamic model is developed to correlate the hydrate dissociation conditions for the systems of H2S + water + salt (single and mixed salts of NaCl, KCl and CaCl2), H2S + water + alcohol (methanol or ethanol), H2S + water + ethylene glycol and H2S + water + mixed salt, and methanol/ethylene glycol. Extended-UNIQUAC (e-UNIQUAC) approach is used for modeling of the activity coefficient of water in aqueous phase. The structural parameters of e-UNIQUAC model are extracted from literature but interaction parameters of this model are obtained by fitting the model with experimental data. The results of the present model are in satisfactory agreement with experimental data. |
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| Keywords: | Gas hydrates Hydrogen sulfide Thermodynamic inhibitor Thermodynamic modeling Phase equilibria |
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