Influence of sodium halides on the kinetics of CO2 hydrate formation

Farhang, Faezeh, Nguyen, Anh V. and Hampton, Marc A. (2014) Influence of sodium halides on the kinetics of CO2 hydrate formation. Energy and Fuels, 28 2: 1220-1229. doi:10.1021/ef401549m

Author Farhang, Faezeh
Nguyen, Anh V.
Hampton, Marc A.
Title Influence of sodium halides on the kinetics of CO2 hydrate formation
Journal name Energy and Fuels   Check publisher's open access policy
ISSN 0887-0624
Publication date 2014-02-20
Year available 2014
Sub-type Article (original research)
DOI 10.1021/ef401549m
Open Access Status Not yet assessed
Volume 28
Issue 2
Start page 1220
End page 1229
Total pages 10
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Subject 1500 Chemical Engineering
2102 Curatorial and Related Studies
2103 Historical Studies
Abstract The mechanism of gas hydrate formation in the presence of kinetic influencing additives has attracted much interest due to the importance of optimizing hydrate formation in areas such as energy supply and the environment. This paper presents experimental studies into hydrate formation of CO 2 gas in the presence of sodium halide salts. Pressure and temperature changes versus time during the hydrate formation process were measured under the isochoric conditions. The effect of anion type and concentration on gas maximum uptake, conversion, storage capacity, induction time, and hydrate growth rate has been examined. Surface potential measurements of the hydrates provided further understanding of how halide anions affect CO2 hydrate formation kinetics. It is shown that sodium halides at an approximately 50 mM (mmol/L) concentration can increase gas consumption and conversion to hydrates, and sodium iodide and sodium bromide in a range of concentrations between 50 and 250 mM can significantly increase the hydrate formation kinetics. It has been concluded that, although salts are known as thermodynamic inhibitors, they can be kinetic promoters at low concentration, which enhances hydrate formation. It is argued that halide ions can significantly influence CO2 hydrate formation due to their strong effect on bulk and surface water structures.
Keyword Gas Hydrate
Dissociation Conditions
Equilibrium Conditions
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
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