期刊
CHEMICAL ENGINEERING SCIENCE
卷 179, 期 -, 页码 1-12出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2017.12.051
关键词
Composite membranes; Membrane materials; ZIF-8; Propylene/propane separations; Membrane separations
资金
- National Natural Science Foundation of China [21406106, 21776124]
- Jiangsu Provincial NSFC [BK20171459]
- Foundation of Jiangsu Educational Committee of China [17KJA530004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
The implementation of membrane-based separation for olefin/paraffin mixtures has the potential to significantly reduce energy consumption, but is limited by the lack of suitable membrane materials with desired performance and low cost. Here, mixed matrix membranes (MMMs) fabricated from incorporating ZIF-8 nanocrystals into the poly(vinyl acetate) (PVAc) matrix exhibit significant improvement of propylene/propane permeability and selectivity as well as the operating stability. On the 39 wt% ZIF-8/PVAc MMMs, both the C3H6 permeability and C3H6/C3H8 selectivity are about 10-fold increase over pure PVAc. The gas transportation mechanism through ZIF-8/PVAc MMMs was also evaluated. The favorable interfacial interaction between the H of the imidazole in the ZIF-8 and ester groups of PVAc enhances the mechanical strength and plasticization resistance of the neat polymer membrane. Therefore, the newly developed composite membrane may have great potential for industrial C3H6/C3H8 separation. (C) 2017 Elsevier Ltd. All rights reserved.
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