Physicochemical properties of tri(butyl)ethylphosphonium diethylphosphate aqueous mixtures

Marta Królikowska , Maciej Zawadzki


This work presents the new experimental data on physical and thermodynamic properties of binary system composed of tri(butyl)ethylphosphonium diethylphosphate and water: solid-liquid equilibrium (SLE) and vapor-liquid equilibrium (VLE) phase diagrams as well as the excess enthalpy of mixing. SLE phase diagram has been determined at wide temperature and composition range using two techniques: dynamic method and differential scanning calorimetry (DSC). Interesting behavior with a solid compound formation was observed for the studied mixture. The isothermal VLE have been measured by an ebulliometric method within temperature range from T = (328.15 to 368.15) K and pressure up to 100 kPa. The excess enthalpy for the tested binary system was determined at T = 298.15 K using isothermal titration calorimeter. Liquid density for pure IL and the binary mixtures with water has been determined at temperature range from T = (298.15 to 348.15) K and from experimental data, the excess molar volumes were calculated. The influence of temperature and composition on measured properties is discussed in terms of IL-water molecular interactions. Furthermore, the binary mixture under study was discussed as an alternative working pair for the absorption heat pump cycle.
Author Marta Królikowska ZChF
Marta Królikowska,,
- Department Of Physical Chemistry
, Maciej Zawadzki ZChF
Maciej Zawadzki,,
- Department Of Physical Chemistry
Journal seriesJournal of Molecular Liquids, ISSN 0167-7322
Issue year2018
Publication size in sheets0.5
Keywords in EnglishIonic liquidsWaterPhase behaviorExcess enthalpyDensityHydrate formation
project[IP2015 037974 POL] Ciecze jonowe jako nowej generacji dodatki do płynów chłodniczych w technologii chłodnictwa absorpcyjnego. . Project leader: Królikowska Marta, , application date 08-10-2015, start date 12-10-2016, planned end date 31-12-2019, Implemented
WCh Projekty finansowane przez MNiSW
Languageen angielski
1-s2.0-S0167732217345439-main.pdf 653.15 KB
Score (nominal)30
ScoreMinisterial score [Punktacja MNiSW] = 30.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) [Punktacja MNiSW (2013-2016)] = 30.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2016 = 3.648 (2) - 2016=3.187 (5)
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