Abstract
Clathrate hydrate formation in methane/isoamylalcohol (3-methyl-1-butanol)/water system has been demonstrated. The first data of quadruple methane/3-methyl-1-butanol/hydrate/water equilibria have been determined over the temperature range of 274-281 K. The equilibrium pressures at the temperatures below 279 K are lower than those of structure-I hydrate formed in methane/water system without 3-methyl-1-butanol. At the temperatures higher than 279 K, the equilibrium pressures are higher than those of the structure-I methane hydrate. Hydrate crystal samples are prepared under two conditions : at 274 K under 2.55 MPa and at 280.0 K under 6.30 MPa. The crystal samples are then subjected to the Raman-spectroscopy and X-ray-diffraction measurements for the determination of the crystallographic structures of the hydrate crystals. The measurements showed a hydrate phase transition depending on the temperature.
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