kazaa81
Hazard to Others
Posts: 368
Registered: 30-4-2004
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Mood: ok
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Chlatrates...these strange componds!
Hello,
I've been curious for a while when I heard about methane hydrate, a chlatrate that looks like ice but burns like methane!
It's a neat thing.
Here a brief introduction about chlatrates, on wikipedia:
(from http://en.wikipedia.org/wiki/Clathrate_hydrate)
"Clathrate hydrates are a class of solids in which gas molecules occupy "cages" made up of hydrogen-bonded water molecules. These "cages" are unstable
when empty, collapsing into conventional ice crystal structure, but they are stabilised by the inclusion of the gas molecule within them. Most low
molecular weight gases (including O2, N2, CO2, CH4, H2S, Ar, Kr, and Xe) will form a hydrate under some pressure-temperature conditions."
Here is another interesting page http://ethomas.web.wesleyan.edu/ees123/clathrate.htm
Now, I would know how feasible is the synthesis of these gas hydrates to the average "garage" chemist.
Thank you for help
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solo
International Hazard
Posts: 3967
Registered: 9-12-2002
Location: Estados Unidos de La Republica Mexicana
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Mood: ....getting old and drowning in a sea of knowledge
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Temperature-Gradient Assisted Gas-Dissolved Liquid-Phase Synthesis of Clathrate Hydrates
Raffie Avakian, Yougang Mao, Danny Chagolla, and Yong Ba*
Energy Fuels, 20 (3), 1197 -1200, 2006.
Abstract
A novel laboratory method to synthesize clathrate hydrates in sealed glass tubes is described in this manuscript. It was known that the major obstacle
in the synthesis of a gas hydrate is from the slow mass transport through the hydrate layer. To circumvent this problem in a sealed glass tube, we
developed a temperature-gradient assisted gas-dissolved liquid-phase reaction. This method allows a clathrate hydrate start to form at the bottom of
a glass tube and then grow through the diffusion of gas molecules from the gas phase passing through the liquid water phase to the water-gas hydrate
interface. This method takes advantage of the fact that gases diffuse much faster in a liquid phase than in a gas-hydrate solid phase. Three examples
to synthesize D2O/Xe, D2O/THF/Xe, and D2O/propane gas hydrates are given. The formations of the first two gas hydrates were verified with 129Xe and
129Xe T1 NMR experiments, and that of the last one was verified with 13C and 2H-1H QEDOR NMR experiments.
Attachment: Temperature-Gradient Assisted Gas-Dissolved Liquid-Phase Synthesis of Clathrate Hydrates.pdf (235kB)
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It's better to die on your feet, than live on your knees....Emiliano Zapata.
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