Thermodynamics of ternary systems in reverse osmosis

✍ Scribed by M.W. Vonk; J.A.M. Smit

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 581 KB
• Volume: 48
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(83)80010-1

✦ Synopsis

Solute retention curves in binary systems are rather well predicted by the Spiegler-Kedem theory. It is shown that this theory is easily generalized to ternary systems if small P~clet numbers are involved. The thermodynamical description is extended with a special parameter due to the solute-solute interaction. Theoretical and experimental retention curves are presented and discussed.

SYMBOLS

--interaction parameter (Eq. 6), m s s -1 mo1-1 --mean of the concentration on both sides of the membrane, mol m -3 --local concentration at the position x, mol m -3 --main-term (i = k ) or cross-term (i =/= k) diffusion coefficient, m 2 s -1 --Faraday constant, C moV 1 --flow parameter defined by Eq. ( ) --solute partition coefficient --flux of the solute through the membrane mol m -2 s -1 --volume flux through the membrane m s -1 --membrane thickness, m --local solute permeability, m 2 s -1 --cross-term permeability, m 2 s -1 --solute retention in a ternary system --solute retention in a binary system --universal gas constant, N m mo1-1 IC 1 --absolute temperature, K