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Separation of aqueous phenol through polyurethane membranes by pervaporation. III. Effect of the methylene group length in poly(alkylene glycols)
Author(s) -
Hoshi Masaru,
Ieshige Munenori,
Saitoh Takanori,
Nakagawa Tsutomu
Publication year - 2000
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/(sici)1097-4628(20000502)76:5<654::aid-app7>3.0.co;2-h
Subject(s) - pervaporation , phenol , solubility , aqueous solution , methylene , membrane , polymer chemistry , polyurethane , swelling , chemistry , condensation polymer , permeation , fourier transform infrared spectroscopy , organic chemistry , materials science , nuclear chemistry , polymer , chemical engineering , biochemistry , composite material , engineering
Separation of phenol from dilute aqueous solution through polyurethane membranes by pervaporation was investigated. The effect of the methylene group length in poly(alkylene glycols) on permselectivity and solubility of phenol was studied. The poly(alkylene glycols) were obtained by polycondensation of 1,6‐hexanediol, 1,8‐octanediol, and 1,10‐decanediol with a sulfuric acid catalyst. Polyethyleneglycol and polytetramethyleneglycol were commercially available. Progress of the polymerization in the poly(alkylene glycols) was confirmed by FTIR, 1 H‐NMR analysis, and SEC measurement. The polyurethanes were obtained by polyaddition reaction of 1,6‐hexamethylenediisocyanate and the poly(alkylene glycol), and were confirmed by FTIR analysis and SEC measurement. The phenol concentration in a permeate liquid increased from 25.1 to 36.2 wt %, and the phenol partial flux also increased from 49.3 to 68.9 g · m −2 · h −1 with increasing the methylene group length in the poly(alkylene glycols), whereas the water partial flux slightly decreased. As a result of sorption measurements, the change in the degree of swelling was small, and the phenol concentration in the membrane increased from 42.1 to 70.8 wt %. The increase in the methylene group length of the poly(alkylene glycols) should contribute to an increase in the hydrophobicity of the polyurethane so that the solubility of phenol to the membrane should increase. The phenol concentration in the permeate liquid and the phenol partial flux increased with an increase in the methylene group length of the poly(alkylene glycols) due to the increase in the phenol solubility for the polyurethane membranes. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 654–664, 2000