Development of an enantioselective membrane from cellulose acetate propionate/cellulose acetate, for the separation of trans-stilbene oxide
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This paper reports the characterization of new synthesized chiral polymeric membranes, based on a cellulose acetate propionate polymer. The flux and permselective properties of the membrane were studied using 50 % ethanol solution of (R,S)-trans-stilbene oxide as feed solution. Scanning electron microscopy revealed the asymmetric structure of these membranes. The roughness of the surface was measured by atomic force microscopy. The resolution of over 97 % enantiomeric excess was achieved when the enantioselective membrane was prepared with 18 wt% cellulose acetate and 8 wt% cellulose acetate propionate in the casting solution of dimethyl formamide/N-methyl-2-pyrrolidone/acetone, at 20 °C and 55 % humidity, and a water bath at 10 °C for the gelation of the membrane. The operating pressure and the feed concentration of the trans-stilbene oxide were 275.57, 345.19, and 413.84 kPa and 2.6 mM, respectively.
KeywordsEnantioselective membrane Chiral separation Cellulose acetate propionate membrane
We gratefully acknowledge support for this research work by Dirección General de Educación Superior Tecnológica (DGEST Grant 4374.11-P). Also, to Ing. Israel Gradilla Martίnez from Centro de Nanociencias y Nanotecnología de la UNAM (CNyN) for SEM analysis, and M.C. Pedro Navarro-Vega from Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana (CGI-ITT) for AFM analysis.
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