Poly(ethylene glycol)-based aqueous biphasic systems: effect of temperature on phase equilibria and on partitioning of 1,10-phenanthroline-copper(II)sulphate complex

Solvent extraction is a proven technology for the selective removal and rec overy of metal ions from aqueous solutions: the use of aqueous biphase syst ems can be attractive for many separation processes. These systems have usu ally been used previously at temperatures around 25 degrees C; however it i s possible that better separations may be achieved at other temperatures: p hase diagrams have been determined for a polyethylene glycol (AMW 3350)-amm onium sulphate-water system over the temperature range 269-343 K and the ef fect of temperature on partitioning has been determined for 1,10-phenanthro line-copper(II) sulphate complex. (C) 2000 Elsevier Science B.V. All rights reserved.