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

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A new method for separating HFC-134a from gas mixtures using clathrate hydrate formation

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Title
A new method for separating HFC-134a from gas mixtures using clathrate hydrate formation
Author
Seo, YongwonTajima, HYamasaki, ATakeya, SEbinuma, TKiyono, F
Keywords
Clathrate; Gas mixtures
Issue Date
2004-09
Publisher
AMER CHEMICAL SOC
Citation
ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.38, no.17, pp.4635 - 4639
Abstract
A new separation method using gas hydrate formation is proposed for separating HFC-134a from gas mixtures containing N2 and HFC-134a. The feasibility of this separation method was investigated from various points of view. First, to determine the mixed hydrate stability region, three-phase equilibria of hydrate (H), liquid water (Lw), and vapor (V) for HFC-134a + N2 + water mixtures with various HFC-134a vapor compositions were closely examined in the temperature and pressure ranges of 275-285 K and 0.1 - 2.7 MPa, respectively. Second, the compositions of the hydrate and vapor phases at a three-phase equilibrium state were analyzed for identical mixtures at 278.15 and 282.15 K to confirm the actual separation efficiency. Third, kinetic experiments were performed to monitor the composition change behavior of the vapor phase and to determine the time required for an equilibrium state to be reached. Furthermore, X-ray diffraction confirmed that the mixed HFC-134a + N2 hydrates were structure II. Through an overall investigation of the experimental results, it was verified that more than 99 mol % HFC-134a could be obtained from gas mixtures after hydrate formation and subsequent dissociation processes. Separation of HFC-134a using hydrate formation can be carried out at mild temperature and low-pressure ranges. No additive is needed to lower the hydrate formation pressure.
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DOI
10.1021/es0497072
ISSN
0013-936X
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UEE_Journal Papers
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