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Title: Primary and secondary aqueous two-phase systems composed of thermo switchable polymers and bio-derived ionic liquids
Authors: Song, Cher Pin
Ramanan, Ramakrishnan Nagasundara
Vijayaraghavan, R.
MacFarlane, Douglas R.
Chan, Eng-Seng
Coutinho, Joao A.P.
Fernandez, Luis 
Ooi, Chien-Wei
UNESCO Clasification: 3303 ingeniería y tecnología químicas
Keywords: Liquid-liquid equilibrium
Cholinium aminoate
Poly(propylene glycol)
Lower critical solution temperature
Secondary aqueoustwo-phase system
Issue Date: 2017
Journal: Journal of Chemical Thermodynamics 
Abstract: The liquid-liquid equilibrium (LLE) data for aqueous two-phase systems (ATPSs) comprising poly(propylene glycol) 400 (PPG 400) and cholinium-aminoate-based ([Ch][AA]) ionic liquid were determined experimentally at T = (288.15 and 308.15) K, while the LLE data at T = 298.15 K was adopted from our previous work for comparison. The experimental binodal data were satisfactorily fitted to a temperature-dependent nonlinear empirical expression. The reliability of tie-line data was confirmed by fitting the experimental data with the Othmer-Tobias and Bancroft equations. Furthermore, for the first time, the electrolyte nonrandom two-liquid model (e-NRTL) was used to correlate the tie-line data of PPG 400 + [Ch][AA] + water systems. The correlations of LLE data using these models provide a good description of the experimental values. The effect of temperature on the phase-forming capabilities of the corresponding [Ch][AA] was assessed using the experimental binodal data and the salting-out coefficient (k2) derived from the Setschenow-type equation. The values of k2 were well correlated to the phase-forming abilities of [Ch][AA], and were found to increase at higher temperature. Upon heating to 308.15 K, the solution of (PPG 400)-rich top phase from the primary PPG 400 + [Ch][AA] + water systems formed the secondary ATPSs. The LLE data of the secondary PPG 400 + [Ch][AA] + water systems was also determined. The PPG 400 was concentrated in the top phase of the secondary ATPS; this could serve as a means to recover PPG 400 from the primary ATPS via the formation of secondary ATPS.
ISSN: 0021-9614
DOI: 10.1016/j.jct.2017.07.028
Source: Journal Of Chemical Thermodynamics[ISSN 0021-9614],v. 115, p. 191-201
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