High-pressure densities of 1-alkyl-3-methylimidazolium hexafluorophosphates and 1-alkyl-3-methylimidazolium tetrafluoroborates at temperatures from (313 to 473) K and at pressures up to 200 MPa

Ryosuke Taguchi, Hiroshi Machida, Yoshiyuki Sato, Richard L. Smith

Research output: Contribution to journalArticlepeer-review

124 Citations (Scopus)

Abstract

Pure component pressure-volume-temperature (pVT) data for five imidazolium-based ionic liquids, 1-ethyl-3-methylimidazolium hexafluorophosphate [emim][PF6], 1-hexyl-3-methylimidazolium hexafluorophosphate [hmim][PF6], 1-octyl-3-methylimidazolium hexafluorophosphate [omim][PF6], 1-ethyl-3-methylimidazolium tetrafluoroborate [emim] [BF4], and 1-hexyl-3-methylimidazolium tetrafluoroborate [hmim] [BF4], were measured with a bellows type apparatus. High-pressure densities of ionic liquids showed smooth trends with temperature and pressure variations except for [emim] [PF6] which exhibited a solid phase transition at temperatures below 352.7 K and which solidified at 100 MPa at 352.7 K. Solid densities were measured and were about 6.3 % higher than those of the liquid. Isothermal compressibilities and thermal expansion coefficients were calculated from the Tait equation that was fit to the pVT data. Isothermal compressibilities increased with alkyl chain length which is probably related to the ionic liquid free volume.

Original languageEnglish
Pages (from-to)22-27
Number of pages6
JournalJournal of Chemical and Engineering Data
Volume54
Issue number1
DOIs
Publication statusPublished - 2009 Jan 8

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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