Abstract
An attempt was made to extend Ferry’s and Renkin’s theories establishing a very comprehensive and general theory that would explain the separation of particles in solution by ultrafiltration with a polymeric membrane. In addition to the pore size distribution N(r) in the membrane (r, pore radius), four factors were considered: (1) the sieving effect due to collision between particles in the filtrand with the pore wall or the pore edge of the membrane (steric factor), (2) viscous interaction between the particle and the pore wall (viscous factor), (3) the hydrodynamic effect on the particle (fractionation factor), and (4) intermolecular forces between the particle and the membrane (intermolecular factor). The ratio φ(a) of the particle concentration in the filtrate to that of the filtrand (a, radius of particle) was expressed as a function of particle size, with the filtration conditions including the flow rate (shear rate) of the filtrand, and the membrane characteristics (N(r) and porosity). The validity of the proposed theory was confirmed by the experiment.
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Kamide, K., Manabe, Si. Mechanism of Permselectivity of Porous Polymeric Membranes in Ultrafiltration Process. Polym J 13, 459–479 (1981). https://doi.org/10.1295/polymj.13.459
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DOI: https://doi.org/10.1295/polymj.13.459
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