Phase equilibrium for ionic semiclathrate hydrate formed with CO2, CH4, or N2 plus tetrabutylphosphonium bromide

Takuya Suginaka, Hiroki Sakamoto, Kento Iino, Yusuke Sakakibara, Ryo Ohmura

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


The article describes the equilibrium conditions for the semiclathrate hydrates formed in the following three ternary systems, CO2+tetrabutylphosphonium bromide+water system, CH4+tetrabutylphosphonium bromide+water system, and N2+tetrabutylphosphonium bromide+water system. The experiments were performed at temperatures between 282.6 and 291.6K, at pressures between 0.15 and 5.10MPa with tetrabutylphosphonium bromide aqueous solution of wTBPB=0.35, where wTBPB denotes the mass fraction of tetrabutylphosphonium bromide, respectively. The equilibrium pressure at a given temperature was lower in the order of CO2, CH4 and N2 thereby indicating the possibility of capturing CO2 from the CH4+CO2 and N2+CO2 mixtures.

Original languageEnglish
Pages (from-to)108-111
Number of pages4
JournalFluid Phase Equilibria
Publication statusPublished - 2013 Apr 25


  • Clathrate hydrates
  • Phase equilibrium
  • Semiclathrate hydrates
  • Tetrabutylphosphonium bromide

ASJC Scopus subject areas

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


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