Viscosities and Densities of Phosphonium-Based Ionic Liquids Mixed with Dodecane

Nadeen Awwad, Xiangyang Liu, Waheed Afzal, John M Prausnitz

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


While phosphonium-based ionic liquids are good solvents for gases, they have high viscosities. Addition of a diluent like dodecane significantly lowers the viscosities of the ionic liquids. In the range 20–90 ℃, viscosities and densities were measured for binary mixtures of dodecane with one of five phosphonium-based ionic liquids: Tributylmethylphosphonium bis(2,4,4-trimethylpentyl)phosphinate [TMPP-PA], Tributyltetradecylphosphonium dodecylbenyzenesulfonate [TTDP-DB], Trimethyloctylphosphonium bis(2,4,4-trimethylpentyl)phosphinate [TMPP-TP], Trihexyltetradecylphosphonium dicyanamide [TTDP-DC], and Trihexyltetradecylphophonium bis(2,4,4-trimethylpentyl)phosphoniate [TTDP-PA]. For every one of these ionic liquids, addition of 10 wt. % dodecane very much reduces the viscosity but slightly reduces the density.
Original languageEnglish
Pages (from-to)839-850
Number of pages12
JournalZeitschrift für Physikalische Chemie
Issue number8
Publication statusPublished - Jul 2014


  • viscosity
  • density
  • dodecane
  • tetraalkylphosphonium-based ionic liquids


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