Vaporization behavior of tetraoctylphosphonium bis(2-ethylhexyl)phosphate ionic liquid

Journal Article · Fri Nov 18 04:00:00 UTC 2016 · Chemical Physics Letters

DOI: https://doi.org/10.1016/j.cplett.2016.11.024 · OSTI ID:1360050

McMurray, J. W.  ^[1]; Zhou, Y. ^[1]; Luo, H. M. ^[1]; Qu, J. ^[1]

---

1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Material Science and Technology Division

We determined the equilibrium vapor pressures, p_e, of the ionic liquid tetraoctylphosphonium bis(2-ethylhexyl)phosphate ([P₈₈₈₈][DEHP]) over the temperature range 409–495 K using mass loss Knudsen effusion. The p_e versus temperature relationship compares well to 1-methyl-3-octylimidazolium bis(trifluoromethylsulfonyl)imide ([C₈mim][NTf₂]) but is lower than that of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C₂mim][NTf₂]) when measured using the same technique. Here, we determined the discrepancies between the p_e for [C₈mim][NTf₂] and [C₂mim][NTf₂] with previous studies is discussed. Finally, the enthalpy and entropy of vaporization for all three fluids are estimated from the Clasius-Clapeyron relation.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1360050
• Journal Information: Chemical Physics Letters, Journal Name: Chemical Physics Letters Journal Issue: C Vol. 667; ISSN 0009-2614
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY