BROWSE

Related Researcher

Author

Seo, Yongwon
Advanced Clean Energy Lab (ACE Lab)
Research Interests
  • Gas Hydrate, Greenhouse Gas, Clean Energy

ITEM VIEW & DOWNLOAD

Experimental verification of methane-carbon dioxide replacement in natural gas hydrates using a differential scanning calorimeter

Cited 2 times inthomson ciCited 1 times inthomson ci
Title
Experimental verification of methane-carbon dioxide replacement in natural gas hydrates using a differential scanning calorimeter
Author
Lee, SeungminLee, YohanLee, JaehyoungLee, HuenSeo, Yongwon
Keywords
POROUS SILICA-GELS; PHASE-EQUILIBRIA; DISSOCIATION ENTHALPIES; CLAPEYRON EQUATION; HIGH-PRESSURE; LIQUID CO2; BEHAVIOR; RECOVERY; PROPANE; ETHANE
Issue Date
201311
Publisher
AMER CHEMICAL SOC
Citation
ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.47, no.22, pp.13184 - 13190
Abstract
The methane (CH4)-carbon dioxide (CO2) swapping phenomenon in naturally occurring gas hydrates is regarded as an attractive method of CO2 sequestration and CH4 recovery. In this study, a high pressure microdifferential scanning calorimeter (HP μ-DSC) was used to monitor and quantify the CH4-CO2 replacement in the gas hydrate structure. The HP μ-DSC provided reliable measurements of the hydrate dissociation equilibrium and hydrate heat of dissociation for the pure and mixed gas hydrates. The hydrate dissociation equilibrium data obtained from the endothermic thermograms of the replaced gas hydrates indicate that at least 60% of CH4 is recoverable after reaction with CO2, which is consistent with the result obtained via direct dissociation of the replaced gas hydrates. The heat of dissociation values of the CH4 + CO 2 hydrates were between that of the pure CH4 hydrate and that of the pure CO2 hydrate, and the values increased as the CO 2 compositions in the hydrate phase increased. By monitoring the heat flows from the HP μ-DSC, it was found that the noticeable dissociation or formation of a gas hydrate was not detected during the CH4-CO 2 replacement process, which indicates that a substantial portion of CH4 hydrate does not dissociate into liquid water or ice and then forms the CH4 + CO2 hydrate. This study provides the first experimental evidence using a DSC to reveal that the conversion of the CH 4 hydrate to the CH4 + CO2 hydrate occurs without significant hydrate dissociation.
URI
Go to Link
DOI
http://dx.doi.org/10.1021/es403542z
ISSN
0013-936X
Appears in Collections:
UEE_Journal Papers

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qr_code

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU