Thermodynamic stability conditions, methane enrichment, and gas uptake of ionic clathrate hydrates of mine ventilation air

Du, Jianwei, Li, Huijuan and Wang, Liguang (2015) Thermodynamic stability conditions, methane enrichment, and gas uptake of ionic clathrate hydrates of mine ventilation air. Chemical Engineering Journal, 273 75-81. doi:10.1016/j.cej.2015.03.046

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Author Du, Jianwei
Li, Huijuan
Wang, Liguang
Title Thermodynamic stability conditions, methane enrichment, and gas uptake of ionic clathrate hydrates of mine ventilation air
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
1873-3212
Publication date 2015-08-01
Sub-type Article (original research)
DOI 10.1016/j.cej.2015.03.046
Volume 273
Start page 75
End page 81
Total pages 7
Place of publication London, United Kingdom
Publisher Academic Press
Collection year 2016
Language eng
Formatted abstract
Abatement of methane from mine ventilation air (MVA) is a significant challenge faced by coal mining industry. A promising method for methane capture from gas mixture is clathrate hydrate formation. In search of suitable and cost-effective low-dosage promoters for hydrate-based methane capture processes, this paper reports the pressure requirement for the hydrate formation of simulated MVA (0.5vol% CH4+99.5vol% air) and its potential for methane extraction, in the presence of tri-n-butyl phosphine oxide (TBPO) or tetra-n-butyl ammonium bromide (TBAB) at three different initial loadings (5wt%, 15wt%, and 26wt%). An isochoric equilibrium step-heating pressure search method was used to measure the hydrate phase equilibrium conditions at the temperature range of (277.61-295.54) K and pressure range of (0.23-19.11) MPa. It was found that at a given initial loading, TBPO was largely more effective than TBAB in reducing the pressure requirement for hydrate formation of MVA. At a given temperature, the equilibrium pressures of the clathrate hydrates were indifferent to the change in the initial loading of TBPO from 5wt% to 26wt%, in contrast to those of TBAB. Gas composition analysis by gas chromatography confirmed that CH4 could be significantly enriched in the ionic clathrate hydrates, and the highest methane enrichment ratio obtained in the present work was 300%, with TBPO at initial loading of 5wt%. At this relatively low loading, within a given period of 5h, TBPO also led to higher gas uptake compared with TBAB. The advantages of TBPO as a promoter of MVA hydrate were discussed.
Keyword Ionic clathrate hydrate
Phase equilibrium
Tetra-n-butyl ammonium bromide
Tri-n-butylphosphine oxide
Ventilation air methane
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 2016 Collection
 
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Created: Sun, 29 Mar 2015, 07:43:44 EST by Dr Liguang Wang on behalf of School of Chemical Engineering