Separation of Alcohol-Water Mixtures by Pervaporation through Cellulosic Membranes

투과기화법에 의한 셀룰로오스계 분리막의 물/알코올 혼합물의 분리

The pervaporation technique is potentially useful in fields where distillation technique are difficult, such as fractionation of close-boiling components, ageotropic mixtures, or isomeric mixtures. The pervaporation apparatus consisted of pervaporation cell made of stainless steel, a circulation pump to agitate the feed, traps cooled by liquid nitrogen to condense the permeate, and a vacuum line. The separation analysis was carried out with a Philips 4550 Gas chromatograph. It is the purpose of this study to investigate the permeation and separation characteristic of the homologeous series of linear alcohol through cellulose, cellulose acetate and carboxymethyl cellulose membranes. Factors affecting these characteristics, such as the physicochemical nature of the permeats, polymer morphology, concentration of alcohols, temperature, and mechanical properties, were discussed.