Reverse osmosis molecular differentiation of organic liquids using carbon molecular sieve membranes

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Liquid-phase separations of similarly sized organic molecules using membranes is a major challenge for energy-intensive industrial separation processes. We created free-standing carbon molecular sieve membranes that translate the advantages of reverse osmosis for aqueous separations to the separation of organic liquids. Polymer precursors were cross-linked with a one-pot technique that protected the porous morphology of the membranes from thermally induced structural rearrangement during carbonization. Permeation studies using benzene derivatives whose kinetic diameters differ by less than an angstrom show kinetically selective organic liquid reverse osmosis. Ratios of single-component fluxes for para-and ortho-xylene exceeding 25 were observed and para-and ortho-liquid mixtures were efficiently separated, with an equimolar feed enriched to 81 mole % para-xylene, without phase change and at ambient temperature.
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Issue Date
2016-08
Language
English
Article Type
Article
Keywords

HOLLOW-FIBER MEMBRANES; GAS SEPARATION PROPERTIES; ORIENTED MFI MEMBRANES; ZEOLITE MEMBRANES; SECONDARY GROWTH; PERMEATION; PERVAPORATION; VAPORS

Citation

SCIENCE, v.353, no.6301, pp.804 - 807

ISSN
0036-8075
DOI
10.1126/science.aaf1343
URI
http://hdl.handle.net/10203/226049
Appears in Collection
CBE-Journal Papers(저널논문)
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