Volumetric and Acoustic Studies of the Ionic Liquid ۱-Butyl-۳-Methylimidazolium Hydrogen Sulfate in Polyethylene Glycol Aqueous Solutions

An aqueous solution of a water soluble polymer, such as poly ethylene glycol (PEG), when mixed with an aqueous solution of another water soluble polymer such as dextran or an organic or inorganic salt, separate into two phases. Liquid-liquid extraction utilizing these aqueous two-phase systems (ATPSs) has been used to separate and purify biological products from the complex mixtures in which they are produced [۱,۲]. Similar to the simple electrolytes, hydrophilic ILs based aqueous two-phase systems are formed when a hydrophilic IL and a certain salt or a certain water soluble polymer are combined with each other in aqueous solution. Although IL-salt aqueous two-phase systems have been studied extensively in recent years, however the information about the IL-polymer aqueous two-phase systems is very scarce in the literature [۳]. In this work, we present our results on density and sound velocity measurements of ionic liquid ۱-butyl-۳-methylimidazolium hydrogen sulfate ([C۴mim][HSO۴]) in water and in aqueous solutions of poly(propylene glycol) ۴۰۰ (PPG۴۰۰), poly(ethylene glycol) ۴۰۰ (PEG۴۰۰) and ۲۰۰۰ (PEG۲۰۰۰) over a range of temperatures at atmospheric pressure that have not been previously published. The effects of polymer and temperature on the apparent molar volume and isentropic compressibility of [C۴mim][HSO۴] are studied.

کلیدواژه ها:

Ionic liquid ، Volumetric ، Acoustic ، poly ethylene glycol