Phase equilibrium conditions for simulated landfill gas hydrate formation in aqueous solutions of tetrabutylammonium nitrate

•Hydrate equilibrium conditions for the simulated landfill gas (LFG) were reported.•Thermodynamic effect of tetrabutylammonium nitrate changes with its mass fraction.•The phase boundary was determined by employing an isochoric pressure-search method. Hydrate phase equilibrium conditions for the simu...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 2014-01, Vol.68, p.322-326
Main Authors: Shi, Ling-Li, Liang, De-Qing, Li, Dong-Liang
Format: Article
Language:English
Subjects:
Carbon dioxide
Clathrate hydrate
Equilibrium conditions
Hydrates
Methane
Nitrates
Phase boundaries
Phase equilibrium
Promotion
Simulation
Tetrabutylammonium nitrate
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Summary:•Hydrate equilibrium conditions for the simulated landfill gas (LFG) were reported.•Thermodynamic effect of tetrabutylammonium nitrate changes with its mass fraction.•The phase boundary was determined by employing an isochoric pressure-search method. Hydrate phase equilibrium conditions for the simulated landfill gas (LFG) of methane and carbon dioxide (50mol% methane, 50mol% carbon dioxide) were investigated with the pressure range of (1.90 to 13.83)MPa and temperature range of (280.0 to 288.3)K at (0.050, 0.170, 0.340, and 0.394) mass fraction (w) of tetrabutylammonium nitrate (TBANO3). The phase boundary between liquid–vapor–hydrate (L–V–H) phases and liquid–vapor (L–V) phases was determined by employing an isochoric pressure-search method. The phase equilibrium data measured showed that TBANO3 appeared a remarkable promotion effect at wTBANO3=0.394, corresponding to TBANO3·26H2O, but inhibition effect at wTBANO3=(0.050, or 0.170) on the semiclathrate hydrate formation. In addition, the application of TBANO3 at 0.340 mass fraction, corresponding to TBANO3·32H2O, displayed promotion effect at lower pressures (below 6.38MPa) and inhibition effect at higher pressures (above 6.38MPa).
ISSN:0021-9614
1096-3626
DOI:10.1016/j.jct.2013.09.029