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

被引：42

作者：

Long, Zhen ^{[1
]}

Zhou, Xuebing ^{[1
,2
]}

Shen, Xiaodong ^{[1
]}

Li, Dongliang ^{[1
]}

Liang, Deqing ^{[1
]}

机构：

[1] Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2015年 / 54卷 / 46期

基金：

中国国家自然科学基金;

关键词：

DUAL FUNCTION INHIBITORS; CARBON-DIOXIDE; HYDROGEN-SULFIDE; GAS; PERFORMANCE; ENRICHMENT; CO2;

D O I：

10.1021/acs.iecr.5b03480

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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.

引用

页码：11701 / 11708

页数：8

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[1] HYDRATES OF CARBON-DIOXIDE AND METHANE MIXTURES [J].