聚偏二氟乙烯與分子篩混成富氧膜製備之研究

A study of manufacturing oxygen enrichment membrane using Polyvinylidene Fluoride hybrid with molecular sieve

顏芳儀(Fang-Yi Yen)

指導教授 ： 鄭東文

淡江大學/工學院/化學工程與材料工程學系碩士班/碩士(2018年)

https://doi.org/10.6846/TKU.2018.00942

摘要

本研究以聚偏二氟乙烯(poly(vinylidene fluoride), PVDF)與分子篩混成富氧膜膜材，並使用親水支撐層合成一平板偏親-疏水複合薄膜，應用於富集氧氣之功用，探討添加不同比例的5A與13X分子篩對氣體分子之吸附作用，並分別選用磷酸三乙酯(TEP)與N-甲基吡咯烷酮(NMP)作為溶劑以製備薄膜，探討製膜條件對氣體分離的性能與其薄膜內部結構對氣體滲透性的影響，進而找出最適化製備薄膜的條件與最適化氣體滲透於薄膜之操作，以適用於富氧膜之應用。

富氧膜的製備條件為選用不同分子篩與溶劑製備複合薄膜，分析不同製膜條件對薄膜微結構、晶相成分、熱穩定性、孔徑大小、機械強度之影響。
在實驗操作部分，氣體分離的驅動力為壓力差，以透膜壓力作為操作變因，並以掃流方式操作平板式模組，比較薄膜對氧氣和氮氣的滲透通量、O2/N2的選擇率，再以人工合成空氣測試氣體分離之性能，以探討薄膜之富集氧氣功用，並比較薄膜之富氧濃度。

研究結果顯示，在透膜壓差為1kg/cm2時，以純氮、氧氣體進行滲透實驗，以TEP作為溶劑並添加50wt%的5A分子篩複合薄膜，可得最佳的O2/N2選擇率為5.079，而人工合成空氣測試氮氧分離的實驗，可知以TEP作為溶劑並添加50wt%的5A分子篩複合薄膜，能達到最佳富氧濃度為25.7%。

關鍵字

聚偏二氟乙烯 ； 富氧膜 ； 氣體分離 ； 5A分子篩 ； 13X分子篩

並列摘要

A study of manufacturing oxygen enrichment membrane using Polyvinylidene Fluoride hybrid with molecular sieve, and a hydrophilic support layer was used to synthesize a flat hydrophilic-hydrophobic composite film for oxygen enrichment. The gas molecules were adsorbed by different ratios of 5A and 13X molecular sieves, and triethyl orthophosphate (TEP) and NMP were used as solvents to prepare thin films. The influence of the internal structure of the film on the gas permeability, and the properties of gas separation were investigated. Further, the optimum conditions for the preparation of the membrane and the optimized gas permeation operation are found, and it is suitable for the application of the oxygen enrichment membrane.
The oxygen-enriched membrane were prepared by different molecular sieves and solvents, and the effects of different prepared conditions on the microstructure, crystalline phase composition, thermal stability, pore size, and mechanical strength of the membrane were also investigated.
In the gas permeation experiments, the transmembrane pressure was used as the operating factor to compare the permeation flux of oxygen and nitrogen and the O2/N2 selectivity. Using synthetic air as the feed gas, the membranes were used for air separation, and the oxygen enrich performance were tested.
The results showed that using pure nitrogen and oxygen gas as the feed gas, when the transmembrane pressure difference was 1 kg/cm2, using TEP as the solvent and adding 50wt% 5A molecular sieve composite film, the best O2/N2 selectivity is 5.079.
Using synthetic air as feed and the oxygen enrich experiments showed that, using TEP as a solvent and adding 50 wt% 5A molecular sieve composite film can achieve an optimal oxygen concentration of 25.7%.

並列關鍵字

Poly(vinylidene fluoride) ； Oxygen enrichment membrane ； Gas separation ； 5A molecular sieve ； 13X molecular sieve

參考文獻

參考文獻

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