Separation of toluene from alkanes using 1-ethyl-3-methylpyridinium ethylsulfate ionic liquid at T=298.15K and atmospheric pressure

Extraction of toluene from aliphatic compounds using an ionic liquid as solvent: Influence of the alkane on the (liquid+liquid) equilibrium

“…This behaviour can be found in other studies for ternary systems {alkane (1) + aromatic compound (2) + ionic liquid (3)} [3,12,13,15,17,36]. For all the systems studied in this work, the selectivity values are higher than unity, indicating that [EMim][ESO 4 ] could be used as solvent for extraction of toluene from linear alkanes.…”

“…In addition to the experimental results, literature data obtained with other ionic liquids [5,9,10,14,15,19] and sulfolane [20][21][22][23] The behaviour of the solute distribution ratio is the opposite: the b values obtained with [EMim] [ESO 4 ] are lower than those obtained in literature for other solvents, although in all cases, b values are less than unity. For this reason, when a separation scheme is designed, it is important to find a compromise between S and b to obtain a big amount of high purity aromatic using the minimum possible amount of ionic liquid.…”

“…From these data, the selectivity and solute distribution ratio were calculated. The values obtained were compared with other published results concerning other ILs [5,9,10,14,15,19], and sulfolane [20][21][22][23]. Moreover, comparing the four systems studied, the influence of the size of the chain length of alkane on the extraction was analysed.…”

“…This paper is a continuation of our work on the application of ILs in the liquid extraction of aromatic compounds from their mixtures with linear alkanes [12][13][14][15][16][17]. The ionic liquid used in this work is constituted by the combination of the 1-ethyl-3-methylimidazolium cation and the ethylsulfate anion, and it has been selected because the alkylsulfate-based ionic liquids are halogenfree and more environmental friendly than other ILs [18].…”

Comparison of Ionic Liquids to Conventional Organic Solvents for Extraction of Aromatics from Aliphatics

“…Liquid–liquid phase equilibrium, capacity, and selectivity have been reported for several combinations of aliphatics and aromatics using ionic liquids as the extraction solvent. Among the ionic liquids studied, the cations used are mostly imidazolium ,− and pyridinium. ,,,− A few studies use pyrrolidinium, ammonium, ,, morpholinium, and other cations, , while the most investigated ionic liquid anion is bis­(trifluoromethylsulfonyl)­imide ([Tf 2 N] − ). In addition, aromatic extractions have been performed with ionic liquid mixtures in an attempt to improve both selectivity and capacity. − In some cases, infinite dilution activity coefficients of aromatic and aliphatic compounds in ionic liquids have been used as a first pass evaluation of the suitability of a particular ionic liquid for aliphatic–aromatic separation. …”