Densities and isothermal compressibilities of ionic liquids - Modelling and application

Jens Abildskov, Martin Dela Ellegaard, J.P. O’Connell

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Two corresponding-states forms have been developed for direct correlation function integrals in liquids to represent pressure effects on the volume of ionic liquids over wide ranges of temperature and pressure. The correlations can be analytically integrated from a chosen reference density to provide a full equation of state for ionic liquids over reduced densities from 1.5 to more than 3.6. One approach is empirical with 3 parameters, the other is a 2-parameter theoretical form which is directly connected to a method for predicting gas solubilities in ionic liquids. Parameters for both methods have been obtained for 28 different ionic liquid systems by reduction of carefully validated PρT data. The results show excellent agreement with the experimental data for nearly all substances over all ranges of conditions. Group contributions to parameters are also explored, leading to an entirely predictive method for ambient pressure densities and densities of compressed ionic liquids. Extensive comparisons are made with other techniques.
Original languageEnglish
JournalFluid Phase Equilibria
Volume295
Issue number2
Pages (from-to)215-229
ISSN0378-3812
DOIs
Publication statusPublished - 2010

Keywords

  • Fluctuation solution theory
  • Density
  • Compressibility
  • Ionic liquids
  • Bulk modulus

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