Thermodynamic Properties of 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide

Abstract

(p,ρ,T) data of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [EMIM][NTf2] at T = (283.15 to 373.15) K and pressures up to p = 100 MPa are reported with an estimated experimental relative combined standard uncertainty of Δρ/ρ = ± (0.01 to 0.08) % in density. The measurements were carried out with a newly constructed Anton Paar DMA HPM vibration-tube densimeter. The system was calibrated using double-distilled water, methanol, toluene and aqueous NaCl solutions. An empiric equation of state for fitting of the (p,ρ,T) data of [EMIM][NTf2] has been developed as a function of pressure and temperature. This equation was used for the calculation of the thermal properties of IL, such as isothermal compressibility, isobaric thermal expansibility, differences in isobaric and isochoric heat capacities, thermal pressure coefficient, and internal pressure.

Thermal properties of 1-butyl-3-methylimidazolium dicyanamide at high pressures and temperatures

“…Thermodynamic properties of ILs, their mixtures, and non-aqueous mixtures containing ILs were reviewed recently by Heintz (2005) and Aparicio (Aparicio et al, 2010). This work is a continuation of our investigations in the fi eld of (p, ρ, T) properties of ionic liquids (Tekin et al, 2007;2009;Safarov and Hassel, 2010;Safarov et al, 2011). Included are the (p, ρ, T) properties of [BMIM] [DCA] at T = (283.15 to 393.15) K, at pressures up to p = 100 MPa, and viscosity measurements at T = (278.15 to 373.15) K, at pressures p = 0.101 MPa.…”

Modeling imidazolium-based ionic liquids with ePC-SAFT

“…4a, discrepancies between model prediction and the experimental data of Gu and Brennecke [58] and Harris et al [59] are observed at pressures higher than 1000 bar for Table 6 ARDs of the ePC-SAFT predicted pure-IL densities with respect to the experimental data up to 3000 bar. [49], the error is 0.18% on average. In the case of [C 4 mim][Tf 2 N], it is slightly higher (0.39%).…”

Thermodynamic properties of 1-butyl-3-methylpyridinium tetrafluoroborate

“…The (p, q, T) measurements of [C4mpyr][BF 4 ] were carried out using a new state-of-the-art high pressure-high temperature Anton-Paar DMA HPM vibrating tube densimeter [11,12,[26][27][28]. The vibration tube (length 15 cm, U radius 1 cm, OD 6 mm, ID 2 mm, liquid volume 2 cm 3 ) was made of corrosion resistant and fabricabile material (Hastelloy C-276, nickel-molybdenum-chromiumtungsten alloy).…”

“…We studied two ionic liquids with viscosity correction [11,12], where the viscosity corrections dependence on temperature and pressure were (q HPM À q)/q HPM = (0.01 to 0.15)%. The corrected density using viscosity values are smaller than not-corrected density values.…”

“…This work is a continuation of our investigations in the field of (p, q, T) properties of ionic liquids [11][12][13][14][15][16][17]. Included are the (p, q, T) properties of 1-butyl-3-methylpyridinium tetrafluorobo- 4 ] at ambient pressure and at T = (283.15 to 363.15) K were also measured using the Anton-Paar DMA 5000 vibrating tube densimeter.…”