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Poly/vinyl alcohol/ membranes for reverse osmosisA description is presented of the results of studies of the water and salt transport properties of PVA membranes, taking into account radiation crosslinked PVA membranes, diffusive salt permeability through PVA membranes, and heat treated PVA membranes. The experimental findings support an occurrence of independent water, and salt permeation processes. It is suggested that the salt permeation is governed by a solution-diffusion transport mechanism. The preparation of thin skinned, asymmetric PVA membranes is also discussed. The employed method has a certain similarity to the classical phase inversion method, which is widely applied in the casting of asymmetric reverse osmosis membranes. Instead of using a gelling bath composed of a nonsolvent for the membrane material and miscible with the solvent from which the membrane is cast, a 'complexing' bath is used, which is a solution of a complexing agent in water.
Document ID
19810057822
Acquisition Source
Legacy CDMS
Document Type
Other - Collected Works
Authors
Katz, M. G.
(NASA Ames Research Center Moffett Field, CA, United States)
Wydeven, T., Jr.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Subject Category
Inorganic And Physical Chemistry
Accession Number
81A42226
Distribution Limits
Public
Copyright
Other

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