Separation of Alkylbenzenes from n-Heptane Using Binary Mixtures of Ionic Solvents

Abstract

A study of liquid–liquid extraction of alkylbenzenes (propylbenzene, butylbenzene, or p-xylene) from n-heptane using ionic solvent binary mixture of 1-octyl-3-methylimidazolium hexafluorophosphate [C8C1im]­[PF6] and 1-ethyl-3-methylimidazolium methylsulfate [C2C1im]­[CH3SO4] is conducted at 313.2 K and a pressure of 101.3 kPa. The distribution ratio and selectivity for systems under study were calculated and compared to systems including other solvents such as sulfolane and other ionic liquids. The use of the present binary mixture of ILs provided a higher mole-based distribution ratio than the use of sulfolane, a pure IL, and a mixture of other ILs. On the other hand, the use of [C8C1im]­[PF6] and [C2C1im]­[CH3SO4] mixture contributed to a mass-based distribution ratio comparable to that of sulfolane and a higher distribution ratio than the others involving ILs and led to a higher selectivity than all the other solvents including sulfolane. Hence the extractive properties of [C8C1im]­[PF6] and [C2C1im]­[CH3SO4] mixture revealed a potential substitute for other solvents. Furthermore, the nonrandom two-liquid model was utilized to assess the data.

The Influence of Extractant Composition on the Asphaltenes Extracted from Asphalt

“…Solvent separation conditions need further optimization, for example, under appropriate negative pressure and distillation time. To reduce the solvent loss in the recovery process, it may be necessary to connect a cold trap to the vacuum pump or use other separation methods instead of vacuum distillation [22,23]. For blank samples at v G = 0, the s B of calculated volume concentration is 1.2% and the LOD of v G is 3.6% for the densimetry method.…”

Highly selective extraction of aromatics from aliphatics using an N‐methylpyrrolidone‐based protic ionic liquid

“…[4] Such separations have been achieved by methods such as liquid-liquid extraction, [5] extractive distillation, [6] and azeotropic distillation. [7] Of these, liquid-liquid extraction is most commonly utilized on account of its low energy consumption and simple equipment. Sulpholane, N-methylpyrrolidone (NMP), N-formylmorpholine, dimethyl sulphoxide, and tetraethylene glycol are typical organic solvents used in liquidliquid extraction.…”