Modification of sago based membrane for pervaporation separation of cesium formate

Abstract

Pervaporation separation process has been established as an important separation unit in chemical engineering. Pervaporation is widely used for dehydration o f aqueous mixtures and is expected to find further progress in organic/organic separation and the organic-water separation. In this study 3 different mixtures were prepared and casted, using mixing ratios o f 40% / 60 %, 50 % / 50 % and 60 % / 40 % respectively for sago starch-water and polyvinyl alcohol (PVA)- water. All the membranes were prepared by solution casting technique. All o f these membranes were cross-linked with (glutaric dialdehyde-sulphuric acid-acetonedeionized water) solution in time periods o f 15 and 30 minutes. Therefore, 6 types of membranes were prepared and all o f them were tested with the pervaporation unit for feed temperatures o f 30°C, 50°C and 70°C and concentrations o f 80% and 90% o f cesium formate brine to separate water from cesium formate. The results o f experiments were calculated to show the values for permeation flux and separation factor. in general with increasing cesium formate concentration in feed, permeation flux and separation factor decreased and with increasing temperature, permeation flux and separation factor increased. Although it should be said that in some experiments the overall rule did not apply.