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Pervaporation characteristics for benzene/cyclohexane mixtures through benzoylcellulose membranes
Author(s) -
Uragami Tadashi,
Tsukamoto Kenji,
Miyata Takashi,
Heinze Thomas
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19990901)200:9<1985::aid-macp1985>3.0.co;2-q
Subject(s) - pervaporation , cyclohexane , permeation , benzene , membrane , chemistry , swelling , sorption , selectivity , polymer chemistry , chemical engineering , organic chemistry , catalysis , adsorption , biochemistry , engineering
Benzoylcellulose (BzCell) membranes with different degrees of benzoylation were synthesized for the separation of benzene/cyclohexane (Bz/Chx) mixtures. A BzCell membrane with a degree benzoylation of 2 showed high benzene‐permselectivity for Bz/Chx mixtures in pervaporation. The permeation rate of the BzCell membrane increases, but the benzene‐permselectivity decreases, with increasing benzene concentration in the feed mixture. This increase in the permeation rate is due to an increase in the swelling of the membrane, whereas the benzene‐permselectivity was attributed to a decrease in the sorption selectivity. With increasing benzoylation of the BzCells, the permeation rate increases significantly, but the benzene‐permselectivity decreases slightly. These results can be explained by the degree of swelling, the density, and the contact angle of the BzCell membranes.