Phase equilibrium for structure-H hydrates formed with methane and methyl-substituted cyclic ether

Ryo Ohmura, S. Matsuda, S. Takeya, T. Ebinuma, H. Narita

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Clathrate hydrate formation in a (methane + either 3-methyltetrahydropyran or 2-methyltetrahydrofuran + water) system is demonstrated. The first data of the quadruple (water + structure-H hydrate + either 3-methyltetrahydropyran or 2-methyltetrahydrofuran + methane) equilibrium pressure-temperature conditions are measured over temperatures from 273 to 286 K. In the 3-methyltetrahydropyran system, the equilibrium pressures are lower by 1.6-2 MPa than those of the structure-I methane hydrate formed in the methane + water system at given temperatures. In the 2-methyltetrahydrofuran system, equilibrium pressures at temperatures below 278 K are lower than those for the structure-I methane hydrate, and at temperatures above 278 K, they are higher. These phase equilibria suggest the formation of hydrates other than structure-I methane hydrates in the two systems. The crystallographic structures of the hydrates are determined to be structure H by means of X-ray diffraction as expected from considerations of sizes and shapes of the 3-methyltetrahydropyran and 2-methyltetrahydrofuran molecules.

Original languageEnglish
Pages (from-to)1515-1523
Number of pages9
JournalInternational Journal of Thermophysics
Volume26
Issue number5
DOIs
Publication statusPublished - 2005 Sep
Externally publishedYes

Fingerprint

Cyclic Ethers
Methane
Hydrates
Phase equilibria
hydrates
Ethers
ethers
methane
Water
Temperature
temperature
water
clathrates
low pressure
X ray diffraction
Hydrogen
Molecules
2-methyltetrahydrofuran

Keywords

  • 2-Methyltetrahydrofuran
  • 3-Methyltetrahydropyran
  • Clathrate hydrate
  • Gas hydrate
  • Methane
  • Structure-H hydrate

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Mechanics of Materials
  • Computational Mechanics
  • Fluid Flow and Transfer Processes
  • Physics and Astronomy (miscellaneous)

Cite this

Phase equilibrium for structure-H hydrates formed with methane and methyl-substituted cyclic ether. / Ohmura, Ryo; Matsuda, S.; Takeya, S.; Ebinuma, T.; Narita, H.

In: International Journal of Thermophysics, Vol. 26, No. 5, 09.2005, p. 1515-1523.

Research output: Contribution to journalArticle

Ohmura, Ryo ; Matsuda, S. ; Takeya, S. ; Ebinuma, T. ; Narita, H. / Phase equilibrium for structure-H hydrates formed with methane and methyl-substituted cyclic ether. In: International Journal of Thermophysics. 2005 ; Vol. 26, No. 5. pp. 1515-1523.
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AU - Matsuda, S.

AU - Takeya, S.

AU - Ebinuma, T.

AU - Narita, H.

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N2 - Clathrate hydrate formation in a (methane + either 3-methyltetrahydropyran or 2-methyltetrahydrofuran + water) system is demonstrated. The first data of the quadruple (water + structure-H hydrate + either 3-methyltetrahydropyran or 2-methyltetrahydrofuran + methane) equilibrium pressure-temperature conditions are measured over temperatures from 273 to 286 K. In the 3-methyltetrahydropyran system, the equilibrium pressures are lower by 1.6-2 MPa than those of the structure-I methane hydrate formed in the methane + water system at given temperatures. In the 2-methyltetrahydrofuran system, equilibrium pressures at temperatures below 278 K are lower than those for the structure-I methane hydrate, and at temperatures above 278 K, they are higher. These phase equilibria suggest the formation of hydrates other than structure-I methane hydrates in the two systems. The crystallographic structures of the hydrates are determined to be structure H by means of X-ray diffraction as expected from considerations of sizes and shapes of the 3-methyltetrahydropyran and 2-methyltetrahydrofuran molecules.

AB - Clathrate hydrate formation in a (methane + either 3-methyltetrahydropyran or 2-methyltetrahydrofuran + water) system is demonstrated. The first data of the quadruple (water + structure-H hydrate + either 3-methyltetrahydropyran or 2-methyltetrahydrofuran + methane) equilibrium pressure-temperature conditions are measured over temperatures from 273 to 286 K. In the 3-methyltetrahydropyran system, the equilibrium pressures are lower by 1.6-2 MPa than those of the structure-I methane hydrate formed in the methane + water system at given temperatures. In the 2-methyltetrahydrofuran system, equilibrium pressures at temperatures below 278 K are lower than those for the structure-I methane hydrate, and at temperatures above 278 K, they are higher. These phase equilibria suggest the formation of hydrates other than structure-I methane hydrates in the two systems. The crystallographic structures of the hydrates are determined to be structure H by means of X-ray diffraction as expected from considerations of sizes and shapes of the 3-methyltetrahydropyran and 2-methyltetrahydrofuran molecules.

KW - 2-Methyltetrahydrofuran

KW - 3-Methyltetrahydropyran

KW - Clathrate hydrate

KW - Gas hydrate

KW - Methane

KW - Structure-H hydrate

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