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Sulfur‐containing copolyimides for the membrane‐based separation of aromatic/aliphatic mixtures
Author(s) -
Suding M. T. H.,
Staudt C.
Publication year - 2012
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.36788
Subject(s) - selectivity , toluene , membrane , sulfur , pervaporation , decane , polymer chemistry , chemistry , materials science , chemical engineering , organic chemistry , permeation , catalysis , biochemistry , engineering
Recently, sulfur‐containing copolyimides have attracted increasing attention as membrane materials for the separation of gaseous, vaporous, or liquid mixtures because of their superior separation properties. Therefore, a novel sulfur‐containing copolyimide based on 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride, 4,4′‐diaminodiphenylsulfide, and 3,5‐diaminobenzoic acid was synthesized, characterized, and extensively investigated in toluene/ n ‐decane pervaporation experiments. To characterize the separation properties of the copolyimide, the flux and selectivity were determined with separation mixtures between 60 and 80 wt % toluene. The separation temperature was varied between 70 and 110°C. Thereby, we observed that when the temperature was increased from 70 to 90°C, the flux and selectivity did not change significantly. In contrast, a temperature change from 90 to 110°C caused an extensive increase in the flux. The most significant change was found for an 80 wt % toluene mixture, where an increase from 1.9 to 7 kg·μm·m −2 ·h −1 was observed. Simultaneously, the selectivity which is a measure of the quality of the separation (α) decreased from α = 11.8 to α = 9.3. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013