Determination of Distribution Coefficients in 1‐Ethyl‐3‐Methyl Imidazolium Chloride‐Methylimidazole Mixtures by Zone Melting

Abstract

The first experimental results concerning the differential distribution coefficient, k diff , for crystallization of 1-ethyl-3-methyl imidazolium chloride (EMIMCl) out of EMIMCl-methylimidazole (MIM) mixtures (5 wt % MIM) are presented. The mixture was purified using the zone melting technique at a fixed crystallization rate of 1.44 mm/h. For quantification of the MIM content after purification an analytical method consisting of the combination of ion chromatography and UV/Vis detection was developed. A distribution coefficient of k diff = 0.2 was found.

Thermal stability and decomposition mechanism of 1-ethyl-3-methylimidazolium halides

“…The currently found melting temperature for [EMIm]Cl (86 C) was in close agreement with that obtained in DSC measurements earlier [11][12][13]. Likewise, the freezing temperature (33 C) published by Ngo et al [10] covers the upper limit of the crystallization temperature interval obtained in this study.…”

“…Ngo et al [10] investigated thermal properties of several imidazolium ILs including [EMIm]X (X = Cl, Br, I) salts using differential scanning calorimetry with relatively high heating/cooling rates of 10 K min À1 and temperature-ramped thermogravimetric analysis (TGA) performed with a heating rate of 20 K min À1 . Other works [9,[11][12][13][14] only present the melting behavior without systematic studies on crystallization and decomposition.…”

The Role of Ionic Liquids in the Lignin Separation from Lignocellulosic Biomass

“…During the zone melting, a molten zone traverses a long ingot of impure solid with a specific velocity [120]. Melting procedure occurs by the move of molten regions towards the edge gradually, which leaves behind a solidified purer substance, while the impurities concentrate in the melt and are moved to one end of the ingot.…”

Recovery and purification of ionic liquids from solutions: a review

“…During the zone melting, a molten zone traverses a long ingot of impure solid with a specic velocity. 205 As the molten region moves along, it melts the solid at its forward edge and leaves a wake of purer substance solidied behind it, while the impurities concentrate in the melt and are moved to one end of the ingot. Choudhury et al 54 was the rst to determine the features (e.g., nature of hydrogen bonding between the cation and anion, anion disorder and crystal packing, etc.)…”