Thermodynamic properties and microscopic analysis of gas hydrate for sequestrating of carbon dioxide into deep ocean = 이산화탄소 심해저장 공정에 필요한 가스 하이드레이트의 열역학적 특성 분석 및 미세구조 연구

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 332
  • Download : 0
Gas hydrates are crystalline compounds formed by specific configuration of hydrogen-bonded water around other molecules. The water (host) molecules arrange themselves to form cavities that can include other (guest) molecules. Methane hydrates exist widely in nature, and they have potentially great importance not only in relation to environmental issue such as global warming, but also as a possible energy resource. Carbon dioxide hydrates can be formed on deep ocean floor, and they are proposed as a method of carbon sequestration. One of the unique properties of hydrates is a change of the specific volume of hydrate formers during their transition from a free gas or liquid state into a solid hydrate state and vice versa. The specific volume of water increases by 26-32 vol.% during the phase transition into a hydrate state, compared with 9 vol.% during the phase transition into ice state. This property allows us to create methods of storage and transportation for large volumes of gas in a hydrate state. The gas hydration process for the storage of carbon dioxide on the ocean floor has recently concentrated. This technology has the possibility of managing huge amount of carbon dioxide by just spreading in ocean floor. For the fundamental understanding of $CO_2$ hydrate in the deep ocean, basic three-phase equilibria and kinetics of $CO_2$ hydrate were measured. In the case of phase equilibria, liquid water and vapor (H-Lw-Vw) for $CO_2-H_2O-NaCl$ (or clay) system are measured. The salt effect on the formation of carbon dioxide hydrate was confirmed. As expected, the addition of NaCl inhibited hydrate formation. The H-Lw-V equilibrium curve of the 3 wt % NaCl and 10 wt % clay solution almost overlapped with that of the 3 wt % NaCl-only solution, but was slightly shifted to the left. The capillary action in the pore induced the corresponding hydrate equilibrium pressure to rise to a higher pressure than that in the bulk water at a specified temperature. By this ef...
Advisors
Lee, Huenresearcher이흔researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
237619/325007  / 020005839
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2004.2, [ xi, 106 p. ]

Keywords

OCEAN SEQUESTRATION OF CARBON DIOXIDE; GAS HYDRATE; MICROSCOPIC ANALYSIS; 미세구조 분석; 이산화탄소 심해저장; 가스 하이드레이트

URI
http://hdl.handle.net/10203/29256
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=237619&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0