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Analysis of data in reverse osmosis with porous cellulose acetate membranes used

1967; Wiley; Volume: 13; Issue: 3 Linguagem: Inglês

10.1002/aic.690130319

1547-5905

Shoji Kimura, S. Sourirajan,

Membrane Separation and Gas Transport

Abstract Reverse osmosis experimental data for some inorganic salts with the porous cellulose acetate membrane used were analyzed to obtain their diffusivity in the membrane. A parameter including the diffusivity was found constant for each film in the concentration range investigated for a particular solute at a particular pressure. This parameter was also independent of feed flow rate. The effect of operating pressure on the parameter was found to depend on the film shrinkage. Mass transfer coefficient between the membrane and the feed solution was also obtained by the analysis, and this value was independently checked by the diffusion current method. Coincidence of these coefficients shows that the ordinary mass transfer coefficient can be used in reverse osmosis with the appropriate driving force. These facts facilitate the prediction of solute separation and membrane throughput rate in reverse osmosis.