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Received January 11, 2017
Accepted February 13, 2017
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삼성분계 THF + 3-OH THF + CH4 크러스레이트 하이드레이트의 상평형 거동 해석 및 분광학적 분석
Spectroscopic Identifications and Phase Equilibria of THF + 3-OH THF + CH4 Clathrate Hydrates
1광주과학기술원 지구환경공학부, 61005 광주광역시 북구 첨단과기로 123 2한국과학기술원 생명화학공학과, 34141 대전광역시 유성구 대학로 291 3광주과학기술원 융합기술학제학부, 61005 광주광역시 북구 첨단과기로 123
1School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123, Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Korea 2Department of Chemical and Biomolecular Engineering (BK21+ program), Korea Advanced Institute of Science and Technology (KAIST), 291, Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea 3School of Integrated Technology (SIT), Institute of Integrated Technology (IIT), 123, Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Korea
Korean Chemical Engineering Research, June 2017, 55(3), 353-357(5), 10.9713/kcer.2017.55.3.353 Epub 2 June 2017
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Abstract
본 연구에서는 THF + 3-OH THF + CH4+ H2O 시스템에서의 크러스레이트 하이드레이트의 형성 과정과 이에 따른 상 거동을 열역학 및 분광학적 방법을 통해 분석하였다. 정적 반응기에서의 온도 변화에 따라 THF와 3-OH THF를 포함하는 유기 분자들의 큰 동공 내 점유에 의해 크러스레이트 하이드레이트가 형성 및 해리되는 상을 압력 변화를 관찰함으로써 확인하였다. 또한, 이들 유기 분자의 상대 조성에 따라 크러스레이트 하이드레이가 안정적으로 존재할 수 있는 상평형 영역이 순수 메탄 하이드레이트 대비 보다 낮은 압력 및 높은 온도 조건으로 동될 수 있음 을 확인하였다. 엑스선 회절 분광 분석을 통해 이들 조성에서의 크러스레이트 하이드레이트는 구조-II의 형성 하는 것을 확인하였으며, 라만 분광 분석을 통해 구조-II의 큰 동공과 작은 동공에 각각 메탄이 점유되어 있을 또한 확인하였다.
In this study, the inclusion phenomena of tetrahydrofuran + 3-hydroxytetrahydrofuran + CH4 clathrate hydrates were explored via thermodynamic and spectroscopic approaches. The phase equilibria of the double hydrates - THF + CH4 and 3-OH THF + CH4 clathrate hydrates - were determined by pressure temperature trace during hydrate formation and dissociation, and the result revealed that the equilibrium pressures were shifted to lower pressure region compared to pure CH4 hydrate. The powder X-ray diffraction patterns revealed that the double hydrates of THF + 3-OH THF formed structure II type clathrate hydrates with CH4. The dispersive Raman spectra of the double clathrate hydrates also exhibited that CH4 can be trapped in both 51264 and 512 cages whereas THF and 3-OH THF were encaged in 51264 cage.
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References
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de Deugd RM, Jager MD, Arons JD, AIChE J., 47(3), 693 (2001)
Rodriguezcarvajal J, Physica B, 192, 55 (1993)
