RT Journal Article
T1 Phase equilibrium for polymer/ionic liquid aqueous two-phase systems
A1 Jiménez, Y.P.
A1 Román Freijeiro, C.
A1 Soto Campos, Ana María
A1 Rodríguez Figueiras, Óscar
K1 Ionic liquids
K1 EOPO
K1 Aqueous two-phase systems
K1 Chen-NRTL
K1 Wilson
AB In this work, the use of ionic liquids as phase-forming components of Aqueous Two-Phase Systems (ATPS) has been evaluated. All ionic liquids used are based on the imidazolium cation, with different alkyl side chains and anions (chloride, bromide, acetate or dicyanamide). As counterpart on the ATPS, a random co-polymer of ethylene oxide and propylene oxide monomers (named EOPO or UCON) was used. Phase diagrams (tie-lines and binodal curves) for a set of UCON/ionic liquid ATPS were measured experimentally at T = (288.15, 298.15 and 308.15 K), using the density and refractive index of the mixtures to obtain the composition of equilibrium phases. The extension of the heterogeneous region increases but the slope of the tie-lines did not change significantly with temperature. Anions had a dramatic effect on the ATPS immiscibility, where acetate produced the largest heterogeneous region and thiocyanate the smallest, following the series OAc− > Cl− > Br− > SCN−. The Chen-NRTL and modified Wilson models were used to correlate the liquid–liquid equilibrium data, but better results were obtained with the Chen-NRTL model.
PB Elsevier
YR 2020
FD 2020-02
LK https://hdl.handle.net/10347/44256
UL https://hdl.handle.net/10347/44256
LA eng
NO Jiménez, Y. P., Román Freijeiro, C., Soto, A., & Rodríguez, O. (2020). Phase equilibrium for polymer/ionic liquid aqueous two-phase systems. Fluid Phase Equilibria, 506, 112387. https://doi.org/10.1016/j.fluid.2019.112387
NO The authors are grateful to Xunta de Galicia for financial support through Project ED431F 2017/05. YJ thanks to the Santander Foundation and to the Universidad de Antofagasta for their support to carry out the research stay at Universidade de Santiago de Compostela.
DS Minerva
RD 29 abr 2026