In turn, the residue of the second stage feeds the third stage, and so on. The second product contains the permeate of the second stage. The residue of the first stage serves as the feed to the second stage. The most permeating components cross the membrane most readily, and form the bulk of the first product. The final residue from the feed side exits as the last (fifth) product. The permeates of the stages exit in the first 4 product streams. For example, declaring 5 product streams results in 4 stages. The number of products determines the number of stages in series. When 3 or more products are declared, the model acts as a multi-stage series separator to simulate progressive component fractionation. A two-product model represents a single-stage separator. The unit requires at least 2 products the first declared product is the permeate and the second product is the feed-side residue. All component flows that do not permeate across the membrane constitute the residue on the feed side. Permeation proceeds from the feed side across the membrane to the Multiple feeds are combined into a single feed at the lowest pressure among all the feed streams. The unit supports between 1 and 10 feeds. K i = Permeability constant of component i (volume / )Īrea = Effective permeable area of the membrane The controlling equation for the model is:įi = Ki x Area x (Pi, residue - Pi, surface )įi = Permeation flow of component i through the membrane (std volume / time) At least one component must have a user-supplied positive-valued permeation constant. Only components that have a permeation constant with a value greater than zero cross the membrane. This model is controlled by the permeation parameters supplied by user input. This feature simulates the fractionation of components across aįor symmetric membranes, this model only applies to crossflow pattern. ![]() Membrane Separator - Technical Information Membrane Separator - Technical Information
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