PMMA/zeolite 4A複合薄膜之氣體分離

PMMA/zeolite 4A composite membranes for gas separation

劉得成(Te-Cheng Liu)

指導教授 ： 賴君義

中原大學/工學院/化學工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400525

摘要

摘要
本研究利用PMMA/zeolite 4A的複合薄膜系統，探討zeolite 4A添加對複合薄膜氣體分離效能的影響，然而若在高分子和沸石界面產生缺陷則可能造成薄膜透過性增高但選擇性降低，為了使沸石與高分子間有較佳之相容性，本研究使用3-(trimethoxysilyl) propylmethacrylate偶合劑 (coupling agent)處理zeolite 4A探討偶合劑處理對沸石填充高分子薄膜氣體分離性能之影響，了解偶合劑在氣體分離所扮演的角色。
由FTIR-ATR結果得知偶合劑確實有附著在沸石表面，並且由SEM證實偶合劑明顯抑制沸石與PMMA之界面孔洞的生成，然而由氣體透過結果顯示，在PMMA/zeolite 4A複合薄膜的系統中，氧氮的氣體選擇性並沒有獲得提升，可能是由於偶合劑雖能改善界面缺陷問題，但是似乎無法完全抑制界面孔洞的生成，所以造成氣體選擇性無法提升的現象。此外，少量的沸石添加將會造成氣體透過係數的下降，這可能是少量沸石的添加反而增加氣體的透過路徑所致，然而偶合劑處理沸石的添加卻可提高PMMA/zeolite 4A(25wt%)薄膜約1.5倍氧氣透過係數，同時維持相近的選擇性，而氣體透過係數的增加主要是由於氣體溶解係數增加所致。經dual sorption mode之分析發現隨著沸石含量的增加氧氣的吸附量會隨之增加造成Henry’s type吸附量提高是複合薄膜氣體吸附量增加的主因，zeolite添加量增加會使Henry’s type吸附的貢獻增高，偶合劑處理zeolite會使得複合薄膜Henry’s type吸附量增加有加成的效果，複合薄膜吸附量增加，是促成薄膜氣體透過係數增加的原因。

關鍵字

氣體分離 ； 複合薄膜 ； 偶合劑 ； 沸石

並列摘要

Abstract
The effect of zeolite 4A on the gas separation performance of PMMA/zeolite 4A composite membrane was investigated in this study. In theory, the filling of zeolite in polymeric membrane can enhance not only the gas permeability but also the selectivity. But the gas permeability will increase and selectivity decreases in the case of poor adhesive in the interface of polymer and zeolite. In order to get better compatibility between polymer and zeolite, the 3-(trimethoxysilyl) propylmethacrylate was used as the coupling agent in this study to treat the zeolite 4A to investigate the effect of coupling agent on the gas separation performance of zeolite filled polymeric membrane and realize the role of coupling agent in gas separation.
The FTIR-ATR result shows that the coupling agent was adhered on the surface of zeolite. The SEM observation also depicts that the pore between the interface of zeolite and PMMA can be suppressed by the usage of coupling agent. The gas separation performance reveals that the gas permeability was decrease by adding a small amount of zeolite in the composite membrane system of PMMA/zeolite 4A. The addition of coupling agent treated zeolite in PMMA membrane can enhance one and half times of gas permeability while maintain the selectivity of PMMA/zeolite 4A(25 wt%) membrane. The dual sorption mode analysis shows that the oxygen adsorption increases with increasing zeolite loading and resulting in the increment of Henry’s type adsorption. The increase of Henry’s type adsorption is the main factor to increase the gas sorption of composite membrane. The increase of gas permeability of composite membrane was resulted from the increase of Henry’s type sorption by adding coupling agent treated zeolite in PMMA polymer.

並列關鍵字

coupling agent ； composite membranes ； zeolite 4A ； gas separation

參考文獻

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