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PERVAPORATION USING ADSORBENT-FILLED MEMBRANES
Ji, W. AND S K. Sikdar*. PERVAPORATION USING ADSORBENT-FILLED MEMBRANES. DOI: 10.1021/ie95036, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. American Chemical Society, Washington, DC, 35(4):1124-1132, (1996).
Membranes containing selective fillers, such as zeolites and activated carbon, can improve the separation by pervaporation. Applications of adsorbent-filled membranes in pervaporation have been demonstrated by a number of studies. These applications include removal of organic compounds from water, dehydration of azeotropic mixtures, and organic/organic separation. Three different types of adsorbents have been evaluated: zeolites, activated carbon, and carbon molecular sieves. Experimental results show the most promising filled membrane is the silicalitefilled poly(dimethylsiloxane) (PDMS) membrane which can be effectively used in the removal of organic compounds from water. The transport of species through adsorbent-filled membranes occurs by a sorption-diffusion mechanism. Sorption of species in the filled rubbery membranes can be described by a dual sorption model. Modeling of the transport process through filled membranes involves mass-transfer resistances in the different phases of the membranes: in the polymer phase, in the adsorbent phase, and in a polymer-adsorbent interface. Several models based on resistance-in-series mechanisms that were developed to describe the experimental results were reviewed.