Equilibrium conditions for semi-clathrate hydrates formed with CO2, N2 or CH4 in the presence of tri-n-butylphosphine oxide

Du, Jianwei and Wang, Liguang (2014) Equilibrium conditions for semi-clathrate hydrates formed with CO2, N2 or CH4 in the presence of tri-n-butylphosphine oxide. Industrial and Engineering Chemistry Research, 53 3: 1234-1241. doi:10.1021/ie403130h

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Author Du, Jianwei
Wang, Liguang
Title Equilibrium conditions for semi-clathrate hydrates formed with CO2, N2 or CH4 in the presence of tri-n-butylphosphine oxide
Formatted title
Equilibrium conditions for semi-clathrate hydrates formed with CO2, N2 or CH4 in the presence of tri-n-butylphosphine oxide
Journal name Industrial and Engineering Chemistry Research   Check publisher's open access policy
ISSN 0888-5885
1520-5045
Publication date 2014-01-22
Year available 2013
Sub-type Article (original research)
DOI 10.1021/ie403130h
Open Access Status File (Author Post-print)
Volume 53
Issue 3
Start page 1234
End page 1241
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2014
Language eng
Formatted abstract
We measured the thermodynamic stability conditions for the N2, CO2, or CH4 semiclathrate hydrate formed from the aqueous solution of tri-n-butylphosphine oxide (TBPO) at 26 wt %, corresponding to the stoichiometric composition for TBPO·34.5H2O. The measurements were performed in the temperature range 283.71–300.34 K and pressure range 0.35–19.43 MPa with the use of an isochoric equilibrium step-heating pressure-search method. The results showed that the presence of TBPO made these semiclathrate hydrates much more stable than the corresponding pure N2, CO2, and CH4 hydrates. At a given temperature, the semiclathrate hydrate of 26 wt % TBPO solution + CH4 was more stable than that of 26 wt % TBPO solution + CO2, which in turn was more stable than that of 26 wt % TBPO solution + N2. We analyzed the phase equilibrium data using the Clausius–Clapeyron equation and found that, in the pressure range 0–20 MPa, the mean dissociation enthalpies for the semiclathrate hydrate systems of 26 wt % TBPO solution + N2, 26 wt % TBPO solution + CO2, and 26 wt % TBPO solution + CH4 were 177.75, 206.23, and 159.00 kJ·mol–1, respectively.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Publication Date (Web): December 17, 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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Created: Wed, 22 Jan 2014, 21:41:48 EST by Dr Liguang Wang on behalf of School of Chemical Engineering