期刊
CHEMICAL ENGINEERING RESEARCH & DESIGN
卷 109, 期 -, 页码 561-572出版社
INST CHEMICAL ENGINEERS
DOI: 10.1016/j.cherd.2016.02.036
关键词
Aromatic/aliphatic separation; Ionic liquids; Liquid-liquid extraction; Vapor-liquid separation; Thermophysical characterization; COSMO-RS
资金
- Ministerio de Economia y Competitividad (MINECO) of Spain [CTQ2011-23533]
- Comunidad Autonoma de Madrid [S2013/MAE-2800]
- Ministerio de Educacion, Cultura y Deporte [AP-2010-0318]
- MINECO [BES-2012-052312]
In this work, we have studied the potential use of the 1-allyl-3-methylimidazolium dicyanamide ([amim][DCA]) and the 1-benzyl-3-methylimidazolium dicyanamide abzmim][DCA]) ionic liquids (ILs) in the liquid-liquid extraction of aromatic hydrocarbons. To design an industrial process of extraction of aromatic hydrocarbons from alkanes, it is essential to measure the liquid-liquid and vapor-liquid equilibria between solutes and solvent, and to perform also a thermophysical characterization of the solvent. Because of this, we have studied the liquid-liquid extraction of toluene from n-heptane at 313.2 K and the vapor-liquid separation of n-heptane from toluene in the presence of [amim] [DCA] and [bzmim] [DCA] at 323.2 K, 343.2 K, and 363.2 K. Densities and viscosities as a function of temperature and the thermal stability of both ILs were also determined. The [amim][DCA] showed suitable extractive and physical properties to replace sulfolane and an adequate maximum operation temperature (MOT) to be employed at industrial scale. The ([bzmim] [DCA]) showed good extractive properties but high viscosities. To complete the study, the Conductor-like Screening Model for Real Solvents (COSMO-RS) methodology was employed to predict the liquid-liquid and vapor-liquid equilibria between the hydrocarbons and ILs and the physical properties of ILs. A comparative evaluation between experimental results and COSMO-RS calculated values was performed. (C) 2016 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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