Phase Diagram of [Amim]Cl + Salt Aqueous Biphasic Systems and Its Application for [Amim]Cl Recovery

Abstract

In this study, binodal curves and tie line data of [Amim]Cl + salt (K 3 PO 4 , K 2 HPO 4 , K 2 CO 3 ) + water aqueous biphasic systems (ABS) were measured and correlated satisfactorily with the Merchuk equation and Othmer-Tobias and Bancroft equations, respectively. [Amim]Cl could be recovered from aqueous solutions using the ABS, and the recovery efficiency could reach 96.80 %. The recovery efficiency was influenced by the concentrations of the salts and their Homeister series: K 3 PO 4 > K 2 HPO 4 > K 2 CO 3 . Our method provides a new and effective route for the recovery of hydrophilic IL using [Amim]Cl + salt + water ABS from aqueous solutions.

Ionic liquid pretreatment of cellulosic biomass: Enzymatic hydrolysis and ionic liquid recycle

“…Rogers et al first reported the formation of an aqueous biphasic system based on [Bmim]Cl, water, and K 3 PO 4 (Gutowski et al, 2003). Subsequently, phase diagrams for a variety of IL/water/salt systems have been described, most of which are based on ILs containing imidazolium cations and chloride anions (Bridges et al, 2007;Deng et al, 2007Deng et al, , 2009Pei et al, 2007;Wu et al, 2008). The binodal curves for these systems can be fitted to the Merchuk equation, with tie-lines described by the Othmer-Tobias or Bancroft equations (Deng et al, 2007).…”

Partition study of textile dye Remazol Yellow Gold RNL in aqueous two-phase systems

“…The resulting system consists of two immiscible phases, with the major component of these systems being essentially water. ATPS are environmentally safe, recyclable, economical viable, quick and scalable for application in industrial processes [13].…”

Evaluation of the impact of phosphate salts on the formation of ionic-liquid-based aqueous biphasic systems

“…In addition, the phosphatebased inorganic salts were selected because they are important ions in biological systems [35]. K 3 PO 4 is indeed the most studied salt as a salting-out species [3,7,13,19,31,[36][37][38][39][40][41][42][43] followed by KH 2 PO 4 and KH 2 PO 4 /K 2 HPO 4 mixtures which are also frequently used at the biotechnological field [19,33,43,45,46].…”