Thermodynamic properties of ionic semiclathrate hydrate formed with tetrabutylphosphonium bromide

Takuya Suginaka, Hiroki Sakamoto, Kento Iino, Satoshi Takeya, Masahiro Nakajima, Ryo Ohmura

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

This paper reports an experimental study to measure the thermodynamic properties of ionic semiclathrate hydrate formed with tetrabutylphosphonium bromide. The thermodynamic measurements were performed on the temperature-composition phase diagram of the hydrate in the range of the mass fraction of tetrabutylphosphonium bromide w TBPB from 0.10 to 0.50 and the hydrate dissociation enthalpy, where w TBPB denotes the mass fraction of tetrabutylphosphonium bromide. The highest equilibrium temperature for tetrabutylphosphonium bromide hydrate was 282.4K at 0.33≤w TBPB≤0.35. Dissociation enthalpy was measured to be 214kJ/kg at w TBPB=0.35 with a differential scanning calorimetry. An attempt was made to determine the crystallographic structure of the tetrabutylphosphonium bromide hydrate by single-crystal X-ray diffraction measurements.

Original languageEnglish
Pages (from-to)25-28
Number of pages4
JournalFluid Phase Equilibria
Volume317
DOIs
Publication statusPublished - 2012 Mar 15

Keywords

  • Clathrate hydrates
  • Equilibrium temperature
  • Phase equilibria
  • Semiclathrate hydrates
  • Tetrabutylphosphonium bromide

ASJC Scopus subject areas

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

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