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Urea transport through composite polyallylamine membranesPolyallylamine composite reverse osmosis membranes were prepared by plasma polymerization and deposition onto small-pored cellulose acetate/cellulose nitrate films. The polyallylamine coated the porous substrate with a thin uniform polymer film which exhibited water permeability and urea rejection, of interest because of the potential application of reverse osmosis to urine purification in closed environmental systems. The flux of C-14 labeled urea was studied under the influence of osmotic gradients provided by sodium chloride solutions. The urea flux was found to be enhanced by an osmotic pressure gradient in the same direction and diminished, but not prevented, by an opposing osmotic pressure gradient. Consideration is given to the mechanism of the urea transport, as well as to the influence of concentration polarization on the experimental results. The minimization of coupled flow in pores of a critical size range is apparently necessary to improve urea rejection.
Document ID
19770063994
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ballou, E. V.
(San Jose State Univ. CA, United States)
Kubo, L. Y.
(Hewlett-Packard Co. Santa Rosa, Calif., United States)
Spitze, L. A.
(San Jose State University San Jose, Calif., United States)
Wydeven, T.
(NASA Ames Research Center Moffett Field, Calif., United States)
Clark, J. A.
(San Jose State Univ. CA, United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1977
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
ASME PAPER 77-ENAS-5
Meeting Information
Meeting: Intersociety Conference on Environmental Systems
Location: San Francisco, CA
Country: US
Start Date: July 11, 1977
End Date: July 14, 1977
Sponsors: AIChE, SAE, AIAA, ASMA, ASME
Accession Number
77A46846
Distribution Limits
Public
Copyright
Other

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