SEPARATION PERFORMANCES OF THE MEMBRANES PREPARED FROM SCHIFF-BASES OF POLY(ALLYLAMINE) FOR ORGANIC SOLUTES

Permselective separation between water and water-soluble organics was investigated up to high concentration levels through crosslinked and m etal complexed membranes of hybrid Schiff-base derivatives of poly(all ylamine), which were prepared by the reaction between pyridine-2-carbo xaldehyde (P) and salicyl aldehyde (S) with varying ratios of P/S. The complexed membranes had strong hydrophilic character and showed an in creased flux and high permselective separation for t-butanol and tetra hydrofuran at high concentrations. Correlations between the performanc e of the complexed membranes and the physicochemical parameters, espec ially the solubility parameters, of alcohols and aprotic solutes were studied and discussed. It was found that a membrane with a higher P/S value tended to reject the aprotic solute with a smaller solubility pa rameter, while other physical properties of the alcohols also effected the alcohol separation.