Heat capacities and excess enthalpies of the (N-hexylisoquinolinium thiocyanate ionic liquid + water) binary systems

Królikowska, Marta; Paduszyński, Kamil; Hofman, Tadeusz; Antonowicz, Jerzy

doi:10.1016/j.jct.2012.06.030

Cited by 26 publications

(20 citation statements)

References 58 publications

(79 reference statements)

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“…As [C 1 C 4 IM][Br] also shows high COP values, it was decided to perform the characterization also for [N 0,1,2,2 ][Br] for comparison. This paper is a continuation of our systematic research on the possibility of applying an aqueous solution of ILs in AR technology. − Here, we present the thermophysical properties, VLE, liquid density, and dynamic viscosity for aqueous solution of two ILs: N , N -dimethyl- N -ethylammonium bromide ([N H,1,2,2 ][Br]) and N , N -dimethyl- N -ethylammonium methanesulfonate ([N H,1,2,2 ][CH 3 SO 3 ]). Both ILs are fully miscible with water and exhibit negligible vapor pressure, which make them attractive for use as absorbents in the AR technology.…”

Section: Introductionmentioning

confidence: 99%

New Experimental Data on Thermodynamic Properties of the Aqueous Solution of N,N-Diethyl-N-methylammonium Bromide and N,N-Diethyl-N-methylammonium Methanesulfonate

et al. 2021

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In this work, new experimental data on thermodynamic properties of ionic liquid (IL) aqueous solutions are presented. The (vapor + liquid) phase equilibria, liquid density, and dynamic viscosity of binary mixtures composed of N,N-diethyl-N-methylammonium bromide ([NH,1,2,2][Br]), or N,N-diethyl-N-methylammonium methanesulfonate ([NH,1,2,2][CH3SO3]) and water are presented as functions of temperature and composition. Both ILs were synthesized and specific basic characterization including the NMR spectra and the water content determination was done. The basic thermal properties of the pure IL, including the glass-transition temperature, heat capacity at glass transition, and temperature and enthalpy of (solid + solid) phase transition as well as the temperature and enthalpy of melting were determined using the differential scanning calorimetry (DSC) technique. The isothermal (vapor + liquid) equilibrium (VLE) was measured by the ebulliometric method within a temperature range from T = 338.15 to 368.15 K and pressures up to 85 kPa. Experimental VLE data were successfully correlated using the NRTL equation. The experimental VLE data were tested for thermodynamic consistency using the Van Ness test. The liquid density and the dynamic viscosity were determined as a function of IL’s mole fraction over a wide temperature range. For the correlation of physicochemical properties, empirical equations were applied. From the experimental density data, the excess molar volumes were determined and correlated using the Redlich–Kister-type equation.

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Section: Introductionmentioning

confidence: 99%

New Experimental Data on Thermodynamic Properties of the Aqueous Solution of N,N-Diethyl-N-methylammonium Bromide and N,N-Diethyl-N-methylammonium Methanesulfonate

et al. 2021

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“…To compare the effect of IL’s anion structure, the thermodynamic properties of an aqueous IL solution with a shorter alkyl chain ([EMIM][HCOO]) are presented in this work. This paper is a continuation of our systematic research on the possibility of applying an aqueous solution of IL in absorption refrigeration technology. − In this work, we present the thermophysical properties of pure ILs and the thermodynamic properties including VLE and liquid density for an aqueous solution of two ILs: 1-ethyl-3-methylimidazolium formate ([EMIM][HCOO]) and 1-ethyl-3-methylimidazolium acetate ([EMIM][CH3COO]). The experimental VLE data for the [EMIM][CH 3 COO] aqueous solution has been compared to those presented by Römich et al .…”

Section: Introductionmentioning

confidence: 99%

Temperature and Composition Dependence of the Thermodynamic Properties of an Aqueous Solution of 1-Ethyl-3-methylimidazolium Formate and 1-Ethyl-3-methylimidazolium Acetate

2021

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New experimental data on the thermodynamic properties of imidazolium-based ionic liquids (ILs) and {IL + water} solutions are presented. The isothermal (vapor + liquid) phase equilibrium (VLE) and the density of binary mixtures composed of 1-ethyl-3-methylimidazolium formate, [EMIM]-[HCOO], or 1-ethyl-3-methylimidazolium acetate, [EMIM]-[CH 3 COO], and water are demonstrated. The experimental data were measured at temperatures from 298.15 to 348.15 K over a wide IL mole fraction under ambient pressure. Both ILs were delivered by IoLiTec, and the water content was determined by the Karl−Fischer titration technique. The thermophysical properties of the pure ILs, that is, glass-transition temperature, heat capacity at glass-transition change, and the temperature and enthalpy of melting, were determined by differential scanning calorimetry technique. The VLE has been measured by an ebulliometric method at temperatures from 338.15 to 368.15 K and pressures up to 85 kPa. The experimental VLE data were tested for thermodynamic consistency using the Van Ness test. The nonrandom two-liquid model equation was used to correlate the experimental VLE data. The density of the tested aqueous solution has been measured as a function of IL's mole fraction over a wide temperature range. The empirical equations were applied for density data correlation. From the experimental density data for the {[EMIM][CH 3 COO] (1) + water (2)} system, the excess molar volumes were determined and correlated using the Redlich−Kister equation.

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“…The data reported on binary mixtures includes 5279 experimental values of the enthalpy change of mixing published in 65 articles − ,− available in the literature until 2015. Six different types of calorimeters, adiabatic, − Calvet-type (refs − , , , , , , , and ), isothermal flow calorimeters, − , isothermal titration calorimeters (refs − …”

Section: Introductionmentioning

confidence: 99%

Mixing Enthalpy for Binary Mixtures Containing Ionic Liquids

et al. 2016

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A complete review of the published data on the mixing enthalpies of mixtures containing ionic liquids, measured directly using calorimetric techniques, is presented in this paper. The field of ionic liquids is very active and a number of research groups in the world are dealing with different applications of these fluids in the fields of chemistry, chemical engineering, energy, gas storage and separation or materials science. In all these fields, the knowledge of the energetics of mixing is capital both to understand the interactions between these fluids and the different substrates and also to establish the energy and environmental cost of possible applications. Due to the relative novelty of the field, the published data is sometimes controversial and recent reviews are fragmentary and do not represent a set of reliable data. This fact can be attributed to different reasons: (i) difficulties in controlling the purity and stability of the ionic liquid samples; (ii) availability of accurate experimental techniques, appropriate for the measurement of viscous, charged, complex fluids; and (iii) choice of an appropriate clear thermodynamic formalism to be used by an interdisciplinary scientific community. In this paper, we address all these points and propose a critical review of the published data, advise on the most appropriate apparatus and experimental procedure to measure this type of physical-chemical data in ionic liquids as well as the way to treat the information obtained by an appropriate thermodynamic formalism.

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Heat capacities and excess enthalpies of the (N-hexylisoquinolinium thiocyanate ionic liquid + water) binary systems

Cited by 26 publications

References 58 publications

New Experimental Data on Thermodynamic Properties of the Aqueous Solution of N,N-Diethyl-N-methylammonium Bromide and N,N-Diethyl-N-methylammonium Methanesulfonate

New Experimental Data on Thermodynamic Properties of the Aqueous Solution of N,N-Diethyl-N-methylammonium Bromide and N,N-Diethyl-N-methylammonium Methanesulfonate

Temperature and Composition Dependence of the Thermodynamic Properties of an Aqueous Solution of 1-Ethyl-3-methylimidazolium Formate and 1-Ethyl-3-methylimidazolium Acetate

Mixing Enthalpy for Binary Mixtures Containing Ionic Liquids

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