Phase Equilibria and Dissociation Enthalpies of Methane Hydrate in Imidazolium Ionic Liquid Aqueous Solutions

This paper reports the thermodynamic inhibition effect of seven ionic liquids (ILs) on methane hydrate formation. The isochoric multistep heating dissociation pressure search method is applied for experimentally determining the phase boundary between hydrate-liquid-vapor (H-L-V) phases and liquid-va...

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Bibliographic Details
Published in:Industrial & Engineering Chemistry Research
Main Authors: Long, Zhen, Zhou, Xuebing, Shen, Xiaodong, Li, Dongliang, Liang, Deqing
Format: Article in Journal/Newspaper
Language:English
Published: 2015
Subjects:
Science & Technology
Technology
Engineering
DUAL FUNCTION INHIBITORS
MINE VENTILATION AIR
EQUATION-OF-STATE
CARBON-DIOXIDE
NATURAL-GAS
HYDROGEN-SULFIDE
CLATHRATE
PERFORMANCE
ENRICHMENT
MIXTURES
Chemical
Methane hydrate
Online Access:http://ir.giec.ac.cn/handle/344007/10922
https://doi.org/10.1021/acs.iecr.5b03480
Description
Summary:This paper reports the thermodynamic inhibition effect of seven ionic liquids (ILs) on methane hydrate formation. The isochoric multistep heating dissociation pressure search method is applied for experimentally determining the phase boundary between hydrate-liquid-vapor (H-L-V) phases and liquid-vapor (L-V) phases in the pressure and temperature ranges of 3.45-13.28 MPa and 274.3-287.6 K, respectively. All the studied IL aqueous solutions are used at a mass fraction of 0.1. A comparison of the thermodynamic inhibitory performance of various ILs is carried out and reveals the predominant role of the type of anion of ILs. Considering the difficulty in directly measuring the dissociation enthalpies, the values of Delta H of methane hydrate are also calculated using the Clausius-Clapeyron equation. It is found that the mean dissociation enthalpies of methane hydrate in the presence of the seven ILs vary from 59.05 to 60.81 kJ.mol(1), and are very close to that in pure water.

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