기상/액상 계면에서의 SF6 하이드레이트 필름 성장거동 연구
Characteristics of sulfur hexafluoride hydrate film growth at the vapor/liquid interface
2
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
SF6 가스는 아크방지능력과 절연 특성이 탁월하기 때문에 단열, 세척, 차폐등과 같은 여러 공업적인 영역에서널리 사용되고 있다. 그러나 SF6의 지구온난화지수는 CO2의 23,900배에 달하며 3,200년 이상 공기중에 잔존한다. 이러한이유로 하이드레이트 형성 원리를 이용하여 복합 가스에서 SF6를 분리해 내는 방법이 기술적, 경제적인 면에 영향을 끼칠것이다. 본 연구에서 SF6 하이드레이트 결정의 형성과 성장에 대한 이해를 위하여 형태학적 분석을 수행하였다. SF6 하이드레이트 필름은 용액과 기상의 계면에서 먼저 생성되었고, 이후에 수지상 가지의 형태로 성장하는 것이 관찰 되었다. 수지상 성장 결정은 기상의 방향으로 성장하였는데 이것은 객체 분자의 농도 차이에 근거한 것으로 사료된다. 본 연구에서는기/액 계면에서의 핵생성, 유동, 성장과 같은 SF6 하이드레이트 결정의 형태학적 특성에 대하여 기술하였다.
Abstract
SF6 gas has been widely used in many industrial fields as insulating, cleaning and covering gases due to its outstanding arc-extinguishing and insulating properties. However, global warming potential of SF6 gas is 23,900 times more than that of CO2 and it remains in the air during 3,200 years. For these reason, technological and economical effects could be expected for the separation of SF6 from gas mixtures by hydrate forming process. In this study, we carried out morphological studies for the SF6 hydrate crystal to understand its formation and growth mechanisms. SF6 hydrate film was initially formed at the interfacial boundary between gas and liquid regions, and then subsequent dendrite crystals growth was observed. The dendrite crystals grew to the direction of gas region probably due to the guest gas concentration gradient. The detailed growth characteristics of SF6 hydrate crystals such as nucleation, migration, growth and interference were discussed in this study.
참고문헌 (17)
- E.D. Sloan, "Clathrate Hydrates of Natural Gases" (1998), Marcel Dekker
- H. Ganji, "Effect of different surfactants on methane hydrate formation rate, stability and storage capacity", Fuel., 86, pp.411~ (2007)
- M.A. Clarke, "Measuring and modeling the rate of decomposition of gas hydrates formed mixtures of methane and ethane", Chem Eng Sci., 56, pp.4715~ (2001)
- Peter Englezos, "Gas Hydrates: A Cleaner Source of Energy and Opportunity for Innovative Technologies (Review)", The Korean Journal of Chemical Engineering, 22(5), pp.671~681 (2005), 한국화학공학회
- H. Lee, "Tuning clathrate hydrates for hydrogen storage", Nature, 434(7034), pp.743~ (2005)
- Jong-wonLee, "Phase Equilibria and Kinetic Behavior of CO2 Hydrate in Electrolyte and Porous Media Solutions: Application to Ocean Sequestration of CO2", The Korean Journal of Chemical Engineering, 19(4), pp.673~678 (2002), 한국화학공학회
- O.R. West, "Negatively buoyant CO2-hydrate composite for ocean carbon sequestration", AIChE J., 49(1), pp.283~ (2003)
- Y.-T. Seo, "Structure and guest distribution of the mixed carbon dioxide and nitrogen hydrates as revealed by X-ray diffraction and C13 NMR spectroscopy", J. Phys. Chem. B, 108(2), pp.530~ (2004)
- Y.-T. Seo, "Efficient recovery of CO2 from flue gas by clathrate hydrate formation in porous silica gels", Environmental Science and Technology, 39(7), pp.2315~ (2005)
- K. Sugahara, "Thermodynamic and raman spectroscopic studies on pressure-induced structural transition of SF6 hydrate", J. Chem. Eng., 51, pp.301~ (2006)
- Y.F. Makogon, "Hydrates of natural gas", Penn Well, ~ (1981), Chapter 2
- M. Sugaya, "Behaviour of clathrate hydrate formation at the boundary of liquid water and a fluorocarbon in liquid or vapor state", Chemical Engineering Science, 51(13), pp.3505~ (1996)
- S. Thomas, "Review of ways to transport natural gas energy from countries which do not need the gas for domestic use", Energy, 28(14), pp.1461~ (2003)
- J.D. Lee, "Dynamics of methane-propane clathrate hydrate crystal growth from liquid water with or without the presence of n-heptane", Crystal growth & Design, 6(6), pp.1428~ (2006)
- G.A. Jeffrey, "Inclusion compounds", pp.135~ (1984), Academic Press
- Yasuhiko H. Mori, "Mass transport across clathrate hydrate films-a capillary permeation model", Chemical Engineering Science, 52(20), pp.3613~ (1997)
- I. Aya, "Stability of clathrate- hydrate of carbon dioxide in highly pressurized water", Am. Soc. Mech. Engrs, 215, pp.17~ (1992)