Clathrate hydrate formation in the system methane + 3-methyl-1-butanol + water: Equilibrium data and crystallographic structures of hydrates

R. Ohmura, S. Takeya, T. Uchida, I. Y. Ikeda, T. Ebinuma, H. Narita

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Clathrate hydrate formation in the system methane + 3-methyl-1-butanol + water is demonstrated. The data of four-phase-equilibria for methane + 3-methyl-1-butanol + hydrate + water equilibria are determined in the temperature range of 273-282 K. The equilibrium pressures at temperatures below 279 K are lower, by 0.4 MPa at most, than those of structure I hydrate formed in the methane + water system without 3-methly-1-butanol, suggesting the formation of a hydrate different from structure I methane hydrate. Conversely, at temperatures above 279 K, the equilibrium pressures are higher by 0.2 MPa than those of the methane structure I hydrate, suggesting the thermodynamically inhibited formation of structure I methane hydrate. To confirm the crystallographic structures of the hydrates, X-ray diffraction and Raman-spectroscopy measurements were performed with hydrate crystal samples prepared at two conditions: at 274.0 K and 2.55 MPa, and at 279.5 K and 6.30 MPa. The measurements revealed a structure II hydrate formation at the lower temperature, contrary to the expectation of the structure H hydrate formation. The hydrate formed at the higher temperature was determined to be of structure I.

Original languageEnglish
Pages (from-to)151-156
Number of pages6
JournalFluid Phase Equilibria
Volume221
Issue number1-2
DOIs
Publication statusPublished - 2004 Jul 30
Externally publishedYes

Keywords

  • 3-Methyl-1-butanol
  • Clathrate hydrate
  • Gas hydrate
  • Methane
  • Mixture
  • Solid-fluid equilibria

ASJC Scopus subject areas

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

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