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

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

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


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
Issue number5
Publication statusPublished - 2005 Sept
Externally publishedYes


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

ASJC Scopus subject areas

  • Condensed Matter Physics


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