期刊
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
卷 160, 期 2, 页码 486-497出版社
HUMANA PRESS INC
DOI: 10.1007/s12010-008-8368-z
关键词
Polydimethylsiloxane; Pervaporation; Thiophene-heptane mixtures; Desulfurization
资金
- Major State Basic Research Program of China [2009CB623404]
- National Natural Science Foundation of China [20736003, 20676067]
- National High Technology Research and Development Program of China [2007AA06Z317]
- Foundation of Ministry of Education of China [20070003130]
Cross-linked polydimethylsiloxane (PDMS)-polyetherimide (PEI) composite membranes were prepared, in which asymmetric microporous PEI membrane prepared with phase inversion method was acted as the microporous supporting layer in the flat-plate composite membrane. Membrane characterization was conducted by Fourier transform infrared and scanning electronic microscopy analysis. The composite membranes were employed in pervaporation separation of n-heptane-thiophene mixtures. Effect of amount of PDMS, cross-linking temperature, amount of cross-linking agent, and cross-linking time on the separation efficiency of n-heptane-thiophene mixtures was investigated experimentally. Experiment results demonstrated that 80-100A degrees A degrees C of cross-linking temperature was more preferable for practical application, as the amount of cross-linking agent was up to 20 wt.%, and 25 wt.% of PDMS amount was more optimal as far as flux and sulfur enrichment factor were concerned. In addition, the swelling degree of and stableness of composite membrane during long-time operation were studied, which should be significant for practical application.
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