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

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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

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Hydrates
hydrates
bromides
Thermodynamic properties
thermodynamic properties
Enthalpy
enthalpy
dissociation
Phase diagrams
Differential scanning calorimetry
heat measurement
phase diagrams
tetrabutylphosphonium
Single crystals
Thermodynamics
X ray diffraction
Temperature
thermodynamics
scanning
temperature

Keywords

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

ASJC Scopus subject areas

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

Cite this

Thermodynamic properties of ionic semiclathrate hydrate formed with tetrabutylphosphonium bromide. / Suginaka, Takuya; Sakamoto, Hiroki; Iino, Kento; Takeya, Satoshi; Nakajima, Masahiro; Ohmura, Ryo.

In: Fluid Phase Equilibria, Vol. 317, 15.03.2012, p. 25-28.

Research output: Contribution to journalArticle

Suginaka, Takuya ; Sakamoto, Hiroki ; Iino, Kento ; Takeya, Satoshi ; Nakajima, Masahiro ; Ohmura, Ryo. / Thermodynamic properties of ionic semiclathrate hydrate formed with tetrabutylphosphonium bromide. In: Fluid Phase Equilibria. 2012 ; Vol. 317. pp. 25-28.
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