Pervaporation of water–dye, alcohol–dye, and water–alcohol mixtures using a polyphosphazene membrane

A novel phosphazene heteropolymer (HPP) was synthesized that contained three differing pendant groups: 2-(2-methoxyethoxy)ethanol (MEE), 4-methoxyphenol, and 2-allylphenol. The resulting polymer is an amorphous elastomer with good film forming properties where MEE and 4-methoxyphenol pendant groups...

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Bibliographic Details
Published in:Journal of membrane science 2002-03, Vol.197 (1), p.89-101
Main Authors: Orme, Christopher J., Harrup, Mason K., McCoy, John D., Weinkauf, Donald H., Stewart, Frederick F.
Format: Article
Language:English
Subjects:
ALCOHOLS
COMPATIBILITY
ELASTOMERS
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HYDROCARBONS
Liquid permeability and separations
MEMBRANES
METHANOL
MIXTURES
Pervaporation
Polymer functionalization
POLYMERS
Polyphosphazene
SOLUBILITY
SOLVENTS
SORPTION
WATER
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Summary:A novel phosphazene heteropolymer (HPP) was synthesized that contained three differing pendant groups: 2-(2-methoxyethoxy)ethanol (MEE), 4-methoxyphenol, and 2-allylphenol. The resulting polymer is an amorphous elastomer with good film forming properties where MEE and 4-methoxyphenol pendant groups influenced the hydrophilicity and the solvent compatibility of the polymer. Sorption studies were performed to characterize the polymer in terms of Hansen solubility parameters. Additionally, group contributions were used to predict the Hansen parameters for the polymer and these data compared favorably with the observed solubility behavior with 15 solvents that ranged from hydrocarbons to water. Homopolymers synthesized from MEE and 4-methoxyphenol were also studied for solubility revealing different behaviors with each representing a limit in hydrophilicity; MEE formed a water-soluble hydrophilic polymer and 4-methoxyphenol yielded a hydrophobic polymer. Membranes formed from HPP were characterized for use as pervaporation membranse using five different feeds: water–dye, methanol–dye, 2-propanol–dye, water–2-propanol, and water–methanol. Fluxes of methanol and isopropanol were greater than for water. For the alcohol–water separations, the alcohol was the favored permeate in all cases with higher fluxes observed for higher alcohol feed concentrations, however, separation factors declined.
ISSN:0376-7388
1873-3123
DOI:10.1016/S0376-7388(01)00633-0