Phase equilibrium and crystallographic structure of clathrate hydrate formed in argon+2,2-dimethylbutane+water system

Kotaro Murayama, Satoshi Takeya, Ryo Ohmura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

This paper reports the four-phase (Lw-H-V-Lg) equilibrium conditions for the structure H hydrates formed in argon+2,2-dimethylbutane. The experiments were performed at temperatures between 275.6 and 284.3K, and at pressures between 2.91 and 9.41MPa. The crystallographic structure of the hydrate was identified to be structure H by powder X-ray diffraction measurements. At a given temperature, the equilibrium pressure of the structure H hydrate formed with argon+2,2-dimethylbutane was lower than that of the structure II pure argon hydrate. The difference in the equilibrium pressure is 8.1-20.9MPa in the temperature range of 275.6-284.3K. Among the system using methane, argon, krypton and xenon, the system using argon shows the highest reduction ratio of equilibrium pressures.

Original languageEnglish
Pages (from-to)64-67
Number of pages4
JournalFluid Phase Equilibria
Volume365
DOIs
Publication statusPublished - 2014 Mar 15

Keywords

  • Argon
  • Clathrate hydrates
  • Crystallographic structure
  • Noble gases
  • Structure H

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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