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標題: 以聚醚碸/蒙脫土複合薄膜為三明治結構離子液體薄膜之支撐層應用於氣體輸送
Gas transport using polyethersulfone(PES)/ montmorillonite(MMT) composite membranes as an ionic liquid membrane support in sandwich form
作者: 梁家毓
Liang, Chia-Yu
關鍵字: gas permeation;聚醚碸複合薄膜;polyethersulfone;composite membrane;liquid membrane;ionic liquid;液膜;離子液體
出版社: 化學工程學系所
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本研究將分成兩個不同主題並討論。第一部分為藉由相轉換法製備聚醚碸/蒙脫土和聚醚碸/二氧化鈦兩種複合薄膜,薄膜的厚度約為25 um,並進行結晶結構、熱穩定性、薄膜型態、氣體滲透性結果之分析。在X光繞射分析儀、示差掃描熱量分析儀、熱重分析儀的結果顯示高分子聚醚碸與蒙脫土或者二氧化鈦等奈米顆粒之間有作用力存在,且複合薄膜的熱穩定性藉由加入奈米顆粒而改善。於薄膜基本性質之分析完成後,本研究將探討二氧化碳及甲烷氣體於複合薄膜中的傳送。
第二部分的研究為使用PES/30% MMT 複合薄膜為支撐層並用三種不同的離子液體製備三明治結構之支撐液膜,氣體滲透利用和第一部分相同的儀器及方式進行量測。三種離子液體的二氧化碳滲透性約為1.5-3.5 barrer,而甲烷之滲透性0.035-0.091 barrer,和使用相同離子液體的文獻值比較,其滲透性太低,但選擇性則幾乎高於所有的文獻值,可能因為支撐液膜的結構不同而導致此結果。

This research was distributed into two different topics and discussed. In first part, PES/montmorillonite (MMT) and PES/TiO2 composite membranes were successfully prepared via phase inversion method. The thicknesse of these composite membranes were about 25 μm. The crystal structure, thermal stability, morphology, permeation performance were characterized in detail. XRD, DSC and TGA results showed that the interaction existed between MMT or TiO2 nanopaticles and PES and the thermal stability of the composite membrane had been improved by the addition of these nanopaticles. The transport of carbon dioxide and methane through these composite membranes has been discussed. The gas permeation measurements were conducted using a semi-open cell which is divided into two parts by the membrane. A constant pressure was maintained at the feed side, while a vacuum was created at the permeate side in the beginning of experiment. The CO2 or CH4 permeability increased in case of PES/MMT membrane with growing different contents, and the selectivity decreased with increasing MMT content. The PES/TiO2 membrane did not show any significant change in permeability. The permeability of both gases increased then decreased with increasing TiO2 content ,the highest value of CO2 and CH4 about 5.7 and 0.33 barrer were obtained at PES/20% TiO2. With growing TiO2 content, the separation factor increased than decreased. The highest value was about 38.5 at PES/4% TiO2.
In second part, three different kinds of ionic liquid were prepared into a supported liquid membrane in sandwich form using PES/30% MMT as a support. The gas permeation was determined by using the same instrument with first part. The permeability of carbon dioxide of these three ionic liquid were about 1.5-3.5 barrer, and the permeability of methane were about 0.035-0.091 barrer. It`s very low for comparing with some literature using the same ionic liquid. But the selectivity was almost higher than some reference. It seem`s that the result was led because of the configuration of supported liquid membrane.
其他識別: U0005-2208201115175500
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