Densities at pressures up to 200 MPa and atmospheric pressure viscosities of ionic liquids 1-ethyl-3-methylimidazolium methylphosphate, 1-ethyl-3-methylimidazolium diethylphosphate, 1-butyl-3-methylimidazolium acetate, and 1-butyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide

Yuya Hiraga, Aya Kato, Yoshiyuki Sato, Richard L. Smith

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

High pressure densities at (10-200) MPa over a range of temperatures and atmospheric pressure viscosities at (293-373) K for three ionic liquids (ILs) that are able to dissolve biomass, 1-ethyl-3-methylimidazolium methylphosphate ([emim][MP]), 1-ethyl-3-methylimidazolium diethylphosphate ([emim][DEP]), and 1-butyl-3-methylimidazolium acetate ([bmim][Ac]) are reported. Densities of the IL 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) were measured at the same conditions to verify the apparatus and to extend the range of present data. The high pressure densities of [emim][MP] and [emim][DEP] are newly measured in this work. Combined expanded uncertainties of densities for [emim][MP], [emim][DEP], [bmim][Ac], and [bmim][Tf2N] were estimated to be 1.5 kg·m-3, 1.4 kg·m-3, 1.4 kg·m-3, and 1.7 kg·m-3, respectively. The Tait equation could correlate the experimental density data to within 0.03 % of average relative deviation. The derivative properties, isobaric expansivity, and isothermal compressibility were calculated using the Tait equation and it was observed that the isobaric expansivity decreased with increasing temperature. The trend of the isobaric expansivity and isothermal compressibility with temperature were in accordance with the theory of corresponding states using methanol for comparison.

Original languageEnglish
Pages (from-to)876-885
Number of pages10
JournalJournal of Chemical and Engineering Data
Volume60
Issue number3
DOIs
Publication statusPublished - 2015 Mar 12

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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