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Reverse osmosis separations of polyethylene glycols in dilute aqueous solutions using porous cellulose acetate membranes
Author(s) -
Hsieh FuHung,
Matsuura Takeshi,
Sourirajan S.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070230226
Subject(s) - reverse osmosis , membrane , polyethylene glycol , aqueous solution , cellulose acetate , chemistry , chemical engineering , peg ratio , chromatography , forward osmosis , organic chemistry , biochemistry , finance , engineering , economics
Abstract Reverse osmosis separations of eight polyethylene glycol (PEG) solutes in the average molecular weight range of 200 to 6750 in single‐solute dilute aqueous solutions have been studied using porous cellulose acetate membranes at the operating pressures of 50, 75, and 100 psig. Diffusivity data for the above PEG solutes have also been obtained from experimental data on intrinsic viscosities. From an analysis of all experimental data, numerical values for the parameters representing the polar (−ΔΔ G / RT ), steric (δ * Σ E s ), and nonpolar (ω * Σ s * ) forces governing reverse osmosis separations of PEG solutes have been generated. These numerical values are useful for precise characterization of cellulose acetate membranes for whose specifications sodium chloride is not the appropriate reference solute because of its low or practically negligible separation under reverse osmosis operating conditions. This work also illustrates that solute separation in reverse osmosis can predictably increase or decrease with increase in operating pressure depending on experimental conditions.