A new microebulliometer for the measurement of the vapor–liquid equilibrium of ionic liquid systems

Abstract

Over the last decade ionic liquids appeared as potential entrainers for extractive distillation processes. However experimental vapor-liquid equilibrium data for ionic liquid containing systems is still scarce since most conventional equilibrium cells are not adequate for these systems. To overcome that limitation a new isobaric microebulliometer, operating at pressures ranging from 0.05 to 0.1 MPa and requiring a sample volume lower than 8 mL was developed and validated in this work. The new apparatus was used to determine isobaric VLE data at pressures of 0.05, 0.07 and 0.1 MPa for eight binary mixtures of 1-ethyl-3-methylimidazolium chloride ([C 2 mim][Cl]), 1-butyl-3methylimidazolium chloride ([C 4 mim][Cl]), 1-hexyl-3-methylimidazolium chloride ([C 6 mim][Cl]), and choline chloride ([N 111(2OH) ][Cl]) with water and ethanol. The experimental data here measured were correlated with the NRTL model.

Interaction studies of cholinium-based ionic liquids with calf thymus DNA: Spectrophotometric and computational methods

“…Its non-flammability, non-volatility, good thermal and radiation stability makes them an excellent alternative for conventional and volatile organic solvents used in industrial and academic research work [5][6][7][8][9][10][11]. Adding to this, IL can dissolve almost every organic and inorganic species, for example, elements (like Phosphorus, Sulphur etc.)…”

Measurements of activity coefficients at infinite dilution of organic solutes and water on polar imidazolium-based ionic liquids

“…The understanding of such interactions can be derived from physico-chemical measurements such as solubilities [7,8], activity coefficients of solutes at infinite dilution ( ∞ 13 γ ) [9][10][11][12], molecular simulation [13,14], spectroscopic techniques [15][16][17], vapor-liquid equilibrium (VLE) data [18,19] and liquid-liquid equilibrium (LLE) data [20,21], as well as from thermodynamic models such as equations of state [22] or from COSMO [19,20].…”

Assessing the activity coefficients of water in cholinium-based ionic liquids: Experimental measurements and COSMO-RS modeling

“…Not only the available equipments, developed for conventional solvents, require a large sample volume ranging from the 250 cm 3 of Wang et al [36] down to the recently reported used of a glass Fischer Labodest equilibrium still that requires a sample volume of circa 35 cm 3 [37][38][39][40][41][42][43]. Moreover the high viscosity of the mixtures rich in ionic liquid difficult a regular boiling of the mixture, what causes long equilibration times, easily reaching 6 h. To overcome these limitations we have recently reported a microebulliometer of just 8 cm 3 of capacity to study these systems [44]. The ebulliometer measurements remain, however, a difficult and very time consuming task so with aim at developing an experimental technique that would provide a fast, reliable and cheap scan of ionic liquids, and their interaction with water, the measurement of water activities using a hygrometer is proposed.…”