在本篇論文中，我們成功的製備出奈米矽沸石及分散均勻之silicalite / PDMS奈米複合膜，並提出奈米矽沸石及奈米複合膜之製備條件有了一些改良的方法。
奈米矽沸石擁有高疏水性、高吸附性、以及超大表面積等優點，因此本篇論文嘗試將奈米矽沸石導入PDMS中，討論矽沸石之吸附特性、薄膜熱穩定性、及用於滲透蒸發分離膜之效能。實驗結果顯示，奈米矽沸石有較高的疏水性、奈米複合膜有較高的熱穩定性；且同樣操作條件下，奈米複合膜的滲透蒸發效果皆優於微米複合膜。

在滲透蒸發實驗的部份，厚度是影響滲透蒸發之滲透流量及分離係數的最大原因，而粒徑的效應又高於添加量的效應。且在厚度50um，添加量為40 wt%之silicalite / PDMS奈米複合膜，45oC，進料濃度20 wt%的條件下，可得到分離係數為2.45，流量更高達220 g/m2-hr之結果。這樣的複合膜其分離係數接近Sano等﹙1994﹚所作之矽沸石薄膜之結果；其矽沸石薄膜在35oC，進料濃度15 vol%，厚度400mm的條件下之分離係數為2.6，流量為38 g/m2-hr。

Silicalite of a high hydrophobicity and large surface area, is naturally viewed as a good adsorbent in organic selective pervaporation. In this thesis, nanocomposite membranes of PDMS containing well dispersed micron-size or nano-size silicalite particles are successfully prepared.
Experimental data show that under the same operation conditions, nanocomposite membranes have better performance in pervaporation of acetic acid/water solutions, mainly because that nano-size silicalite particles have higher sorption ratio of acetic acid to water than the micron-sized ones. They also have better thermal stability according to the TG analyses.

Thickness is the major factor for pervaporation performance in both separation factor and permeation flux. The next factor is particle size, which exhibits more influence than silicalite loading. When the thickness of the nanocomposite membrane is 50um, silicalite loading is 40 wt%, operation temperature is 45oC and feed concentration is 20 wt%, we can have a separation factor of 2.45 and permeation flux of 220 g/m2-hr. The separation factor is almost the same as the pure silicalite membrane shown by Sano et al. (1994), and the permeation flux is much higher than that of Sano et al. The separation factor of Sano et al. was 2.6 and the flux was 38 g/m2-hr, under the conditions of 35oC, 15 vol% feed concentration and 400mm thickness.

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