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http://dx.doi.org/10.9713/kcer.2018.56.5.679

Concentration of Sodium Chloride, Sodium Acetate and Sodium Citrate Solutions by using Polyamide Reverse Osmosis Membrane  

Lee, Heungil (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
Kim, In Ho (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
Publication Information
Korean Chemical Engineering Research / v.56, no.5, 2018 , pp. 679-686 More about this Journal
Abstract
Reverse osmosis (RO) concentration of sodium chloride, sodium acetate, and sodium citrate solutions has been performed by polyamide RO membrane. Concentration polarization phenomena was also studied by changing pressure, solute kinds, and initial solution concentration. Pressure effect on permeation flux was that the increase of flux was accompanied by the increase of pressure. Flux increase was observed by the decrease of initial solution concentration. Surface concentration on the RO membrane increases and so flux declines due to the concentration polarization. In the later phase of concentration, concentration polarization effect was decreased by the back diffusion of solute from the polariztion layer. In case of sodium citrate, its large ion size and charge density resulted in the discrepancy between theory and experimental data of concentration polarization. It may be due to electric repulsion on the membrane surface.
Keywords
Reverse osmosis; Salts permeation; Concentration polarization;
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