| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 105 === In this study, meso-/microporous AlBTC MOA (metal-organic aerogel) were synthesized via the sol-gel process. Its gelation mechanism was discussed by changing its reaction temperature and the concentration of AlBTC sol. Then as-synthesized particles were successfully incorporated into the chitosan polymeric solution to form mixed matrix membranes (MMMs) and used to dehydrate 90 wt% butanol/water mixture under 25oC in a pervaporation process. The as-prepared MMMs showed a good pervaporation performance on separating butanol/water. Because the meso-/microporous in AlBTC MOA provides more channels to permeate the feed, and the hydrophilicity of AlBTC MOA enhances the separation factor. However, when too much particles doped, the aggregation were occurred and formed unselective pores in the membrane, causing the pervaporation efficiency to reduce. As a result, we found the AlBTC/CS MMMs with 0.3 wt% AlBTC-0.075 doped had the best pervaporation performance. Its flux, separation factor, and pervaporation separation index (PSI) are 1233 g/m2h, 1574, 1941 Kg/m2h respectively. Moreover, when 0.25 g glutaraldehyde crosslinking is added AlBTC-0.075/CS MMMs obtains an even better performance. Its flux, separation factor, and PSI are 526 g/m2h, 4578, 2410 Kg/m2h respectively.
Summarizing the above, the AlBTC/CS MMMs broke the trade-off between the flux and the separation factor, therefore, the MMMs has high flux and separation factor at the same time. In addition, the pervaporation performance of the AlBTC/CS MMMs in butanol dehydration clearly exceeds the upper limit of the membranes reported previously. It proves that the as-prepared AlBTC MOA and AlBTC/CS MMMs in this work, are promising materials in the pervaporation process.
Key words: Pervaporation, Mixed Matrix Membranes, Metal-Organic Aerogel, alochol dehydration
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