Hollow-fiber separator feed composition

Hollow-fiber separator comp os it ion-dependent permeab ility feed composition feed pressure fiber dimensions multistage pressure drop Horizontal decanters HTU... 

Salts rejected by the membrane stay in the concentrating stream but are continuously disposed from the membrane module by fresh feed to maintain the separation. Continuous removal of the permeate product enables the production of freshwater. RO membrane-building materials are usually polymers, such as cellulose acetates, polyamides or polyimides. The membranes are semipermeable, made of thin 30-200 nanometer thick layers adhering to a thicker porous support layer. Several types exist, such as symmetric, asymmetric, and thin-film composite membranes, depending on the membrane structure. They are usually built as envelopes made of pairs of long sheets separated by spacers, and are spirally wound around the product tube. In some cases, tubular, capillary, and even hollow-fiber membranes are used. 

Results and Discussion. Figure 14 demonstrates the principal of separation through Ion-exchange membranes, where the counter-lon/permeate Interactions determine the mass transport properties of the system. In this set of experiments, the feed mixture was an azeotropic composition of 2-propanol and water (88.5/11.5 wt.X). A Naflon hollow fiber permeator was used In pervaporatlon mode. The... 

Consider equation (8.1.427) describing the variation of Xaz with membrane area in countercurrent membrane gas separation in a hollow fiber device with no longitudinal diffiision/dispersion and symmetrical hollow fiber membrane. The feed-gas composition varies from x/ f to Xa21 as per Figure 8.1.51(a). 

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