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http://dx.doi.org/10.9713/kcer.2011.49.3.367

Phase Equilibria and $^{13}C$ NMR Analysis of the Double Semi-Clathrates Containing TBAB  

Lee, Seung-Min (Department of Chemical Engineering, Changwon National University)
Park, Sung-Min (Department of Chemical Engineering, Changwon National University)
Lee, Young-Jun (Department of Chemical Engineering, Changwon National University)
Lee, Sung-Won (School of Chemical and Biological Engineering, Seoul National University)
Seo, Yong-Won (Department of Chemical Engineering, Changwon National University)
Publication Information
Korean Chemical Engineering Research / v.49, no.3, 2011 , pp. 367-371 More about this Journal
Abstract
TBAB (tetra-n-butyl ammonium bromide) forms a semi-clathrate with water under atmospheric pressure conditions and recently has attracted great attention due to its usage as a thermodynamic promoter in gas storage and separation process using gas hydrate formation. In this study, we measured the three-phase (hydrate (H) - liquid water ($L_{w}$)-vapor (V)) equilibria of the ternary $CH_{4}$+TBAB+water and $CO_{2}$+TBAB+water mixtures at the TBAB concentrations of 5 and 32 wt% to investigate promoting characteristics of TBAB. The greater promotion effect of TBAB was observed at 32 wt% than at 5 wt%. This result was in good agreement with that from pure TBAB semi-clathrate phase diagram under atmospheric pressure conditions. Through $^{13}C$ NMR analysis of the $CH_{4}$+TBAB semi-clathrate, it was found that $CH_{4}$ molecules are enclathrated in the cages of the double semi-clathrate and the position of resonance peak from encaged $CH_{4}$ molocules in the double semi-clathrate is the same as that from encaged $CH_{4}$ molocules in the pure $CH_{4}$ hydrate of structure I.
Keywords
Semi-Clathrate; Gas Hydrate; TBAB; $CH_{4}$; $CO_{2}$;
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Times Cited By KSCI : 1  (Citation Analysis)
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