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Increasing the performance of asymmetric pervaporation membranes for the separation of methanol/methyl‐tert‐butyl ether mixtures by the introduction of sulfonated polyimide into the poly(amide‐imide) matrix
Author(s) -
Sapegin Denis Andzheevich,
Gubanova Galiikolaevna,
Popova Eleikolaevna,
Koova Svetlana Viktorovna
Publication year - 2021
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.49982
Subject(s) - pervaporation , membrane , polyimide , methanol , ether , imide , polymer chemistry , polyamide , selectivity , permeation , materials science , polymer , chemical engineering , chemistry , organic chemistry , composite material , catalysis , biochemistry , layer (electronics) , engineering
A series of novel asymmetric membranes from polymer composites of poly(amide‐imide) with various content of sulfonated polyimide (1–6 wt%) was obtained through the nonsolvent‐induced phase separation process. Selective transport properties of the obtained materials were investigated in terms of pervaporation separation of methanol/methyl‐tert‐butyl ether mixtures at different temperatures. The introduction of the sulfonated polyimide to the poly(amide‐imide) matrix leads to a significant increase in membrane flux and an overall decrease in the process selectivity. Composite membranes having 1 wt% sulfonated polyimide in the matrix showed increased values of membrane flux (0.960 kg m −2 h −1 in comparison with 0.682 kg m −2 h −1 for unmodified membranes at 40°C, 10 wt% methanol), while having similar selectivity values (79.2 wt% methanol in permeate in comparison with 82 wt% for unmodified membranes at 40°C, 10 wt% methanol). Modified membrane showed the highest separation factor of 147 while separating methanol from its 3 wt% mixture with methyl‐tert butyl ether at 52°C with the overall flux of 1.01 kg m −2 h −1 . A semiempirical mathematical model was developed and applied to test the efficiency of obtained membranes in the hybrid process of methanol/methyl‐tert‐butyl ether mixtures separation.