Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Co-solvent effects in LLE of 1-hydroxyethyl-3-methylimidazolium based ionic liquids plus 2-propanol plus dichloromethane or 1,2-dichloroethane
AU - Najdanovic-Visak, Vesna
AU - Rodriguez, Ana
AU - Visak, Zoran P.
AU - Rosa, Joao N.
AU - Afonso, Carlos A. M.
AU - Nunes da Ponte, Manuel
AU - Rebelo, Luis Paulo N.
PY - 2007/6/15
Y1 - 2007/6/15
N2 - Several regimes of the (T, x(1), x(2)) surface of the liquid-liquid phase diagram at or close to a nominal pressure of 0.1 MPa of the ternary systems 1-hydroxyethyl-3-methylimidazolium based ionic liquids (1), [C(2)OHmim][X] ([X] = [PF6](-) or [BF4](-) or [CF3SO3](-) or [(CF3SO2)(2)N](-)), +dichloromethane or 1,2-dichloroethane (2), +2-propanol (3) were investigated. For the first time, phase splitting in a (IL + dichloromethane) system was found and the related temperature-composition phase diagrams for all aforementioned ILs were determined. In the case of 2-propanol, partial miscibility was observed only for ILs containing the [PF6](-) and [BF4](-) anions. When the latter are involved in ternary systems, the ternary phase diagrams at ambient conditions show wide areas of total miscibility, thus revealing an unexpected and large co-solvent effect. For the ternary mixture ([C-2 OHmim] [PF6] + dichloromethane + 2-propanol), a moderate pressure effect on the cloud point with a negative pressure-temperature slope was detected. (c) 2007 Elsevier B.V. All rights reserved.
AB - Several regimes of the (T, x(1), x(2)) surface of the liquid-liquid phase diagram at or close to a nominal pressure of 0.1 MPa of the ternary systems 1-hydroxyethyl-3-methylimidazolium based ionic liquids (1), [C(2)OHmim][X] ([X] = [PF6](-) or [BF4](-) or [CF3SO3](-) or [(CF3SO2)(2)N](-)), +dichloromethane or 1,2-dichloroethane (2), +2-propanol (3) were investigated. For the first time, phase splitting in a (IL + dichloromethane) system was found and the related temperature-composition phase diagrams for all aforementioned ILs were determined. In the case of 2-propanol, partial miscibility was observed only for ILs containing the [PF6](-) and [BF4](-) anions. When the latter are involved in ternary systems, the ternary phase diagrams at ambient conditions show wide areas of total miscibility, thus revealing an unexpected and large co-solvent effect. For the ternary mixture ([C-2 OHmim] [PF6] + dichloromethane + 2-propanol), a moderate pressure effect on the cloud point with a negative pressure-temperature slope was detected. (c) 2007 Elsevier B.V. All rights reserved.
KW - HEXAFLUOROPHOSPHATE
KW - EQUILIBRIA
KW - ionic liquid
KW - chloroatkanes
KW - PHASE-BEHAVIOR
KW - WATER
KW - GREEN SOLVENTS
KW - ETHANOL
KW - IMIDAZOLIUM
KW - 1-hydroxyethyl-3-methylimidazolium
KW - DISSOLUTION
KW - phase behaviour
KW - PRESSURE
KW - TEMPERATURE
U2 - 10.1016/j.fluid.2007.02.020
DO - 10.1016/j.fluid.2007.02.020
M3 - Journal article
VL - 254
SP - 35
EP - 41
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
SN - 0378-3812
IS - 1-2
ER -