期刊
ADVANCED SCIENCE
卷 8, 期 17, 页码 -出版社
WILEY
DOI: 10.1002/advs.202004999
关键词
nanoporous carbon; organic solvent forward osmosis (OSFO); pore rigidity; shape selectivity; solvent-solvent separation
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2021R1C1C1012014]
- C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2021M3D3A1A0102210431]
This research demonstrates the separation of hexane isomers using membranes with molecular specificity, effectively reducing energy intensity through size- and shape-based separation of molecules. The ultramicroporous carbon membrane produced with 6FDA-polyimides successfully separated isomers of different shapes, achieving fractionation without liquid-phase pressurization. Such membranes have the potential to significantly reduce energy intensity in bulk chemical separations of organic liquids.
Liquid-phase chemical separations from complex mixtures of hydrocarbon molecules into singular components are large-scale and energy-intensive processes. Membranes with molecular specificity that efficiently separate molecules of similar size and shape can avoid phase changes, thereby reducing the energy intensity of the process. Here, forward osmosis molecular differentiation of hexane isomers through a combination of size- and shape-based separation of molecules is demonstrated. An ultramicroporous carbon membrane produced with 6FDA-polyimides realized the separation of isomers for different shapes of di-branched, mono-branched, and linear molecules. The draw solvents provide the driving force for fractionation of hexane isomers with a sub-0.1 nm size difference at room temperature without liquid-phase pressurization. Such membranes could perform bulk chemical separations of organic liquids to achieve major reductions in the energy intensity of the separation processes.
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