Phase equilibrium and crystallographic structures of clathrate hydrates formed in methane + 2,2-dimethylpentane + water system

Takahiro Kozaki, Satoshi Takeya, Ryo Ohmura

Research output: Contribution to journalArticle

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Abstract

This article reports the pressure-temperature conditions for the four-phase methane vapor + aqueous liquid + hydrocarbon liquid + hydrate equilibrium in the methane + water + 2,2-dimethylpentane system. The pressure and temperature ranges are from (2.430 to 4.823) MPa and from (273.7 to 279.3) K, respectively. The four-phase equilibrium pressures of this system at temperatures below 278.5 K are lower than the three-phase methane vapor + aqueous liquid + hydrate equilibrium pressures in the 2,2-dimethylpentane free system, whereas the four-phase and three-phase equilibrium pressures are equal at temperatures above 278.5 K. This difference in the equilibrium pressures due to the addition of 2,2-dimethylpentane indicates the formation of a structure-H hydrate at temperatures below 278.5 K. The crystallographic structures of the hydrates formed in this system have been identified by powder X-ray diffraction measurements.

Original languageEnglish
Pages (from-to)2820-2823
Number of pages4
JournalJournal of Chemical and Engineering Data
Volume53
Issue number12
DOIs
Publication statusPublished - 2008 Dec 11

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Methane
Hydrates
Phase equilibria
Water
Liquids
Temperature
Vapors
Hydrocarbons
X ray powder diffraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Phase equilibrium and crystallographic structures of clathrate hydrates formed in methane + 2,2-dimethylpentane + water system. / Kozaki, Takahiro; Takeya, Satoshi; Ohmura, Ryo.

In: Journal of Chemical and Engineering Data, Vol. 53, No. 12, 11.12.2008, p. 2820-2823.

Research output: Contribution to journalArticle

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