Thermodynamic Stabilities of Tetra-n-butyl Ammonium Chloride + H2, N2, CH4, CO2, or C2H6 Semiclathrate Hydrate Systems

The thermodynamic stabilities of semiclathrate hydrates were investigated in the tetra-n-butyl ammonium chloride (TBAC) aqueous solution (mole fraction of TBAC is 0.0323) + H2, + N2, + CH4, + CO2, and + C2H6 systems. The dissociation temperature of each semiclathrate hydrate is higher than that of t...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2010-02, Vol.55 (2), p.839-841
Main Authors: Makino, Takashi, Yamamoto, Tomoyo, Nagata, Kento, Sakamoto, Hiromi, Hashimoto, Shunsuke, Sugahara, Takeshi, Ohgaki, Kazunari
Format: Article
Language:English
Subjects:
Chemical thermodynamics
Chemistry
Exact sciences and technology
General and physical chemistry
Mixtures
Thermodynamic properties
Online Access:Get full text
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Summary:The thermodynamic stabilities of semiclathrate hydrates were investigated in the tetra-n-butyl ammonium chloride (TBAC) aqueous solution (mole fraction of TBAC is 0.0323) + H2, + N2, + CH4, + CO2, and + C2H6 systems. The dissociation temperature of each semiclathrate hydrate is higher than that of the simple TBAC semiclathrate hydrate (hydration number is 30) except for the C2H6-containing system in the whole pressure region under the present experimental conditions. Isobaric dissociation temperatures of the TBAC + H2, + N2, + CH4, and + CO2 hydrates increase in this order. The temperatureāˆ’pressure projection indicated that the hydrate structural transition occurs around 3 MPa in the TBAC + CH4 semiclathrate hydrate system, while the three-phase equilibrium curves of the other TBAC hydrate systems do not show any discontinuity in gradient under the present conditions.
ISSN:0021-9568
1520-5134
DOI:10.1021/je9004883