Phase equilibria study of the (N-octylisoquinolinium thiocyanate ionic liquid + aliphatic and aromatic hydrocarbon,or thiophene) binary systems |
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| Institution: | 1. Institute of Chemical Technology Prague, Department of Chemical Engineering, Technická 5, 166 28 Prague, Czech Republic;2. University of West Bohemia, Research Centre New Technologies, Univerzitní 8, 306 14 Plzeň, Czech Republic;1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China;2. Analysis and Test Center, Chinese Academy of Tropical Agricultural Sciences, Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Laboratory of Quality and Safety Risk Assessment for Tropical Products, Haikou 571101, Hainan, PR China;1. University of Salerno, Department of Industrial Engineering, Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy;2. University of Salerno, Department of Chemistry and Biology, A. Zambelli, Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy;3. INSTM Research Unit, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy;1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2. National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, Beijing 100083, China;3. Journals Publishing Center, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Binary liquid + liquid phase equilibria for 8 systems containing N-octylisoquinolinium thiocyanate, C8iQuin]SCN] and aliphatic hydrocarbon (n-hexane, n-heptane), cyclohexane, aromatic hydrocarbon (benzene, toluene, ethylbenzene, n-propylbenzene) and thiophene have been determined using dynamic method. The experiment was carried out from room temperature to the boiling-point of the solvent at atmospheric pressure. For the tested binary systems the mutual immiscibility with an upper critical solution temperature (UCST) for {IL + aliphatic hydrocarbon, or thiophene} were observed. The immiscibility gap with lower critical solution temperature (LCST) for the {IL + aromatic hydrocarbon} were determined. The parameters of the LLE correlation equation for the tested binary systems have been derived using NRTL equation. The phase equilibria diagrams presented in this paper are compared with literature data for the corresponding ionic liquids with N-alkylisoquinolinium, or N-alkylquinolinium cation and with thiocyanate – based ionic liquids. The influence of the ionic liquid structure on mutual solubility with aliphatic and aromatic hydrocarbons and thiophene is discussed. |
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| Keywords: | Ionic liquid Phase diagram NRTL equation Separation process |
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