paleoclimate saw-tooth pattern & natural gas clathrate hydrates
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Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates
Chung-Chieng Lai
Henry’s Law:concentration in water =
K × pressure in air
Saw-tooth pattern; Temperature leads CH4 that leads CO2
570
CH4 + 2 O2 CO2 + 2 H2O + Heat
catalyst
Bacteria, etc.
Heat: 195,000 cal / mole of CH4
810,000 J
400
750
400200
(a)
(b)
(c)
(d)
Methane hydrate
Structure I binary hydrate:
46H2O + 6(mG) + 2(sG)
sG – small-size gas, such as N2
mG – medium-size gas, such as CH4
Clathrasil (mineral) at work
46 SiO2·6(lG)·2(sG)
sG: N2, Ar, Xe, CH4
lG: N2O, CO2, Kr, Xe,
CH3NH2 (methylamine)
Dissociation:
Gas hydrate → gas + water
Gas hydrate solid to gas phase boundary:
T = T0 + a log (P/P0) (1)
T, T0, a : temperature
P, P0 : pressure
Phase boundary plots
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