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

We determined the equilibrium vapor pressures, p e, of the ionic liquid tetraoctylphosphonium bis(2-ethylhexyl)phosphate ([P 8888][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 ([C 8mim][NTf 2]) but is lower than that of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 2mim][NTf 2]) when measured using the same technique. Here, we determined the discrepancies between the p e for [C 8mim][NTf 2] and [C 2mim][NTf 2] with previous studies is discussed. Finally, the enthalpy and entropy of vaporization for all three fluids are estimated from the Clasius-Clapeyron relation.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Material Science and Technology Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Chemical Physics Letters
Additional Journal Information:
Journal Volume: 667; Journal Issue: C; Journal ID: ISSN 0009-2614
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE
OSTI Identifier:
1360050
Alternate Identifier(s):
OSTI ID: 1415246