Abstract
Simulation of pressure-driven membrane process has been carried out considering two different types of solute (silica and dextran) and membrane (partially permeable and totally retentive) in a stirred cell using the Aspen Engineering Suite. One solute, silica, exerts negligible osmotic pressure but the other, dextran, offers adequate osmotic pressure. Silica is very susceptible to form a gel layer while dextran has no such tendency. Two types of membrane are considered for this work. One membrane completely separates solute from the solvent (totally retentive membrane) and the other does it partially (partially permeable membrane). The second type of membrane is regarded as highly compact granulated particle layer which has a different range of porosity. So the diffusivity within the membrane layer is referred to as hindered back diffusion. Osmotic pressure model and gel polarization model have been considered for batch and continuous mode operation. Silica suspension has been simulated with totally retentive membrane and dextran solution is simulated with partially retentive membrane in batch and continuous mode, respectively. The effect of applied pressure, stirring speed, and initial feed concentration on permeate flux, membrane surface concentration, permeate concentration, and true and observed rejection have been studied.
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