471344 A Water-Immiscible Heavy Guest Molecule for Fast Methane Hydrate Formation

Tuesday, November 15, 2016: 12:48 PM
Yosemite C (Hilton San Francisco Union Square)
Hyery Kang1, Yun-Ho Ahn2, Dong-Yeun Koh3, Seungjun Baek3, Jae W. Lee4 and Huen Lee5, (1)Chemical & Biomolecular Eng, KAIST, Daejeon, Korea, The Republic of, (2)KAIST, Daejeon, (3)KAIST, Daejeon, Korea, The Republic of, (4)Chemical & Biomolecular Eng, KAIST, Daejeon, South Korea, (5)KAIST, Daejeon, South Korea

Clathrate hydrates have an ice-like appearance but a three dimensional structure having hydrogen bonded water cavities in which small guest molecules such as methane, hydrogen, carbon dioxide and light organic molecules are encaged. They can play an important role in CO2 separation and also be a safe and economical medium for natural gas storage. But to apply gas hydrate techniques to industrial processes, we have to overcome the two barriers: (1) Gas hydrates are usually formed at the interface between the bulk gas and water phases. Once the solid hydrates cover the interface, gas hydrate formation decreases significantly because the hydrate layer becomes a barrier for mass transfer, and thus hydrate conversion is very low. (2) The gas hydrate formation kinetics is extremely unfavorable. This talk addresses the circumvention of the mass transfer and kinetic limits by introducing a water-immiscible heavy guest molecule of idomethane to enhance methane hydrate formation. We will demonstrate the key idea for maintaining liquid-liquid interfaces available for continuous methane gas access to the hydrate growth front and achieving a complete conversion to methane-idomethane binary hydrates within 2 minutes in an unstirred reactor system.




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See more of this Session: Gas Hydrates Science and Engineering I
See more of this Group/Topical: Engineering Sciences and Fundamentals