eprintid: 5921
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/59/21
datestamp: 2023-11-09 16:17:40
lastmod: 2023-11-09 16:17:40
status_changed: 2023-11-09 16:04:15
type: article
metadata_visibility: show
creators_name: Quental, M.V.
creators_name: Passos, H.
creators_name: Kurnia, K.A.
creators_name: Coutinho, J.A.P.
creators_name: Freire, M.G.
title: Aqueous Biphasic Systems Composed of Ionic Liquids and Acetate-Based Salts: Phase Diagrams, Densities, and Viscosities
ispublished: pub
keywords: ABS resins; Biodegradable polymers; Energy utilization; Mass transfer; Phase diagrams; Phase separation; Salts; Solvent extraction; Viscosity; Volatile fatty acids, Aqueous biphasic system; Bancroft equation; Conventional polymers; Extraction and purifications; Hydration energies; Imidazolium-based; Large-scale applications; Reduce energy consumption, Ionic liquids
note: cited By 34
abstract: Ionic-liquid-based aqueous biphasic systems (IL-based ABS) have been largely investigated as promising extraction and purification routes. In this context, the determination of their phase diagrams and the physical properties of the coexisting phases are of high relevance when envisaging their large-scale applications. Low viscosities improve mass transfer and reduce energy consumption, while the knowledge of their densities is important for equipment design. In this work, novel phase diagrams for aqueous solutions of imidazolium-based ILs combined with acetate-based salts, namely KCH3CO2 or NaCH3CO2, are reported and discussed. The ability of the acetate-based salts to induce the phase separation not only depends on the ions hydration energy, but also on the concentration of "free" ions in solution. The tie-lines, tie-line lengths, and critical points are also addressed. Experimental measurements of density and viscosity of the coexisting phases, for the different systems and at several compositions and temperatures, are additionally presented. The Othmer-Tobias and Bancroft equations are also applied to ascertain the tie-lines coherence. It is here shown that low-viscous IL-based ABS, with a high difference in the densities of the coexisting phases, can be formed with organic and biodegradable salts thus offering enhanced features over conventional polymer-based systems. © 2015 American Chemical Society.
date: 2015
publisher: American Chemical Society
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84935843756&doi=10.1021%2fje501044u&partnerID=40&md5=25ec239979c655842667011aacb5854a
id_number: 10.1021/je501044u
full_text_status: none
publication: Journal of Chemical and Engineering Data
volume: 60
number: 6
pagerange: 1674-1682
refereed: TRUE
issn: 00219568
citation:   Quental, M.V. and Passos, H. and Kurnia, K.A. and Coutinho, J.A.P. and Freire, M.G.  (2015) Aqueous Biphasic Systems Composed of Ionic Liquids and Acetate-Based Salts: Phase Diagrams, Densities, and Viscosities.  Journal of Chemical and Engineering Data, 60 (6).  pp. 1674-1682.  ISSN 00219568