Phase equilibrium of ionic semiclathrate hydrates formed with tetrabutylammonium bromide and tetrabutylammonium chloride

Kai Sato, Hiroki Tokutomi, Ryo Ohmura

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

This paper reports the accurate phase equilibrium measurements of two ionic semiclathrate hydrates with tetrabutylammonium bromide (TBAB) and tetrabutylammonium chloride (TBAC). These ionic semiclathrate hydrates are suggested as cool energy storage media for air-conditioning system since their dissociation heats of phase transitions are as large as 200-500kJ/kg and they form at 278-293K under atmospheric pressure. Tetrabutylammonium bromide and tetrabutylammonium chloride form ionic semiclathrate hydrates and there are several previous reports of the equilibrium temperatures of these hydrates in the literature. However, there is inconsistency in the literature data of equilibrium temperatures. Also, there are no clear notifications of experimental procedures and uncertainty of measurements in some of the previous reports. Therefore, we have performed accurate measurements of the phase equilibrium of tetrabutylammonium bromide and tetrabutylammonium chloride hydrates and the comparison with the literature data is also made in this paper. The highest equilibrium temperature for tetrabutylammonium bromide system was 285.9K at 0.35<wTBAB<0.37, where wTBAB denotes the mass fraction of tetrabutylammonium bromide (or the mole fraction of tetrabutylammonium bromide, 0.029<xTBAB<0.032), under atmospheric pressure. That for tetrabutylammonium chloride system was 288.2K at wTBAC=0.35, where wTBAC is the mass fraction of tetrabutylammonium chloride (or the mole fraction of tetrabutylammonium chloride, xTBAC=0.034), under atmospheric pressure.

Original languageEnglish
Pages (from-to)115-118
Number of pages4
JournalFluid Phase Equilibria
Volume337
DOIs
Publication statusPublished - 2013 Jan 1

Keywords

  • Clathrate hydrates
  • Phase equilibria
  • Semiclathrate hydrates
  • Tetrabutylammonium bromide
  • Tetrabutylammonium chloride

ASJC Scopus subject areas

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

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