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Poly(Vinyl Alcohol)‐Based Polyelectrolyte Pervaporation Membranes
Author(s) -
SUN BENHUI,
ZOU JIAN
Publication year - 2003
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2003.tb06014.x
Subject(s) - pervaporation , polyelectrolyte , vinyl alcohol , membrane , permeation , chemistry , dehydration , polymer chemistry , alcohol , chemical engineering , solvent , cationic polymerization , ethanol , organic chemistry , polymer , biochemistry , engineering
A bstract : By modifying poly(vinyl alcohol) (PVA), phosphatic anionic PVA (P‐PVA) and quaternary ammonium cationic PVA (C‐PVA) with various degrees of substitution (D.S.) were synthesized. The effects of synthesis conditions on the degree of substitution were studied. With these two kinds of materials, polyelectrolyte complexes were formed and their solubilities in water were studied. Pervaporation composite membranes were prepared from P‐PVA, C‐PVA, and their polyelectrolyte complexes. Some of the membranes showed good separation performance. The polyelectrolyte complex membrane prepared by mixing P‐PVA (D.S. 2.3%) and C‐PVA (D.S. 2.9%) with weight ratio of 1/1, showed a permeation rate of 378g/m 2 h and separation factor of 2,250 for dehydration of ethanol/water mixture (ethanol 95.4 wt%) at a feed temperature of 75°C. Some factors that influenced pervaporation performance included type of polyelectrolyte, degree of substitution, ratio of polyanion and polycation, feed temperature, feed concentration, and elapsed time. Solvent resistance of pervaporation composite membranes was also evaluated.