Phase equilibrium for structure I and structure H hydrates formed with methylfluoride and methylcyclohexane

Satoshi Takeya, Ryo Ohmura

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Abstract

This paper reports the pressure-temperature conditions for the three-phase aqueous liquid + hydrate + vapor equilibrium in the structure I hydrate forming water + methylfluoride water system and for the four-phase aqueous liquid + hydrate + liquid hydrocarbon + vapor equilibrium in the water + methylcyclohexane + methylfluoride system. The pressure and temperature ranges of the present measurements are from (0.267 to 3.582) MPa and from (273.5 to 296.2) K in the water + methylfluoride system and from (0.185 to 2.703) MPa and from (273.7 to 294.2) K in the water + methylcyclohexane + methylfluoride system. The crystallographic structure of the hydrate formed in the water + methylcyclohexane + methylfluoride system at 279.7 K was determined to be structure H based on the X-ray diffraction measurement. The phase equilibrium data suggest the formation of structure I simple methylfluoride hydrate at temperatures above 289 K in the system with methylcyclohexane.

Original languageEnglish
Pages (from-to)635-638
Number of pages4
JournalJournal of Chemical and Engineering Data
Volume52
Issue number2
DOIs
Publication statusPublished - 2007 Mar 1

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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