Liquid–Liquid Equilibrium And Extraction Capacity of the PPG 425–NaNO3–H2O System

— In this work, we study the liquid–liquid phase equilibrium for a new extraction system with polypropylene glycol 425 (PPG 425) and sodium nitrate depending on the HCl concentration at a temperature of 298.15 K. Experimental and calculated binodal data are presented. The experimental equilibrium and calculated data of the liquid–liquid nodes are correlated. The interfacial distribution of Fe(III), Zn(II), and Cu(II) ions, contained in large quantities in electronic waste, is studied in the PPG 425–NaNO 3 –H 2 O system. The dependences of the quantitative characteristics of the extraction of Fe(III), Zn(II), and Cu(II) on the concentration of NaCl and HCl and the initial metal concentration are established. The possibility of efficient separation of Fe(III), Zn(II), and Cu(II) ions in the proposed extraction system is shown.