Abstract
Enantioselective thin film composite polymer membranes were prepared by interfacial co–polymerization of a mixture of different chiral compounds (especially amino acids) and piperazine with trimesoyl chloride in-situ on polysulfone ultrafiltration membrane. The chemical compositions of composite membranes were determined by ATR-FTIR. Membranes are characterized by using Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) (1-5). The optical resolution of α-amino acids was performed in pressure driven separation mode at different pressures using aqueous solutions. The effects of different process parameters such as operating pressure, permeation time and feed concentration on the performance of membranes were studied. The composite membranes exhibited 50-60% separation of amino acids. The membrane permeated D-enantiomers preferentially such that an enantiomeric excess of 90-94% for D-enantiomer of amino acids in permeates were achieved. The corresponding separation factors (α) were in the range of 15-20. High enantiomeric excess was obtained at dilute feed solutions.
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