title: Development of tropine-salt aqueous two-phase systems and removal of hydrophilic ionic liquids from aqueous solution.
abstract: A novel aqueous two-phase systems (ATPS) composed of a small molecule organic compound tropine and an organic or inorganic salt aqueous solution has been developed for the first time. The phase behavior of tropine-salt ATPS was systemically investigated and the phase equilibrium data were measured in different temperatures and concentrations and correlated by the Merchuk equation with satisfactory results. The detection of the conductivity and particle size proved the formation of micelle in the process of forming tropine-salt ATPS. The separation application of the ATPS was assessed with the removal of hydrophilic benzothiazolium-based ionic liquids (ILs) from aqueous solution. The result showed that ILs were effectively extracted into the top tropine-rich phase. Finally, ILs in the top tropine-rich phase were further separated by the means of adsorption-desorption with DM301 macroporous resin and ethanol. The method of novel tropine-salt ATPS combined with adsorption-desorption is demonstrated a promising alternative thought and approach for the removal or recovery of hydrophilic compounds from aqueous media and also could provide a potential application for bio-separation.
authors.affiliation: School of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Haoran
authors.initials: H
authors.lastname: Wu
authors.affiliation: School of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Shun
authors.initials: S
authors.lastname: Yao
authors.affiliation: School of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Guofei
authors.initials: G
authors.lastname: Qian
authors.affiliation: School of Chemical Engineering, Sichuan University, Chengdu 610065, PR China. Electronic address: hangsong@vip.sina.com.
authors.forename: Hang
authors.initials: H
authors.lastname: Song
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D052578:Ionic Liquids / Q000302:isolation & purification*; D012965:Sodium Chloride; D014326:Tropanes; D014867:Water / Q000737:chemistry*
chemical_list: D052578:Ionic Liquids; D014326:Tropanes; D014867:Water; D012965:Sodium Chloride; C005864:tropine
keywords: Adsorption-desorption; Aqueous two-phase systems; Benzothiazolium-based ionic liquids; Tropine