Phase equilibria insights into amine-water-NaCl interactions in liquid-liquid biphasic systems for temperature swing solvent extraction desalination

This study sheds light on the fundamental phenomena governing temperature swing solvent extraction (TSSE) desalination by investigating influence of equilibrium partitioning water, salt, and solvent. The distribution components across a range temperatures feed salinities typical to TSSE hypersaline was examined for two amine solvents. A tradeoff between selectivity productivity is established, providing novel framework assess performance. Salt shown be key determinant in diminishing ability extract water at lowered salting-out amines from aqueous phase. Na+ Cl− ions consistently partition into phase equimolar ratios. Analysis further reveals linear correlation natural logarithms salt activity coefficients contents organic collaborating results suggest that water-ion interactions are more important than amine-ion phase, resolving critical gap understanding transport. findings this can provide insights informed development desalination.