成果報告書詳細
管理番号20110000001342
タイトル*平成22年度中間年報 グリーン・サステイナブルケミカルプロセス基盤技術開発 規則性ナノ多孔体精密分離膜部材基盤技術の開発(8)
公開日2011/9/9
報告書年度2010 - 2010
委託先名学校法人早稲田大学
プロジェクト番号P09010
部署名電子・材料・ナノテクノロジー部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 本プロジェクトでは、化学・石油関連産業分野における分離精製工程に膜分離を導入することによって大幅な省エネルギー効果を実現するために、膜分離実用化のための基盤技術を開発することを目的とした。特に、本研究では需要・汎用性の高いイソプロピルアルコールおよび酢酸の脱水用分離膜部材の開発を行うことを目的とした。早稲田大学は短尺膜における分離膜製造基盤技術および分離膜評価技術開発を担当し、工業化に必要な基盤技術の確立を目指した。
英文要約Membrane separation using zeolite will offer us great opportunities to reduce energy demands revolutionary in future chemical and petroleum industries. In this project, we aim at developing fundamental technologies of zeolite membranes for application to important chemical processes such as dehydration of 2-propanol(IPA) and acetic acid(AcOH).

The dehydration of IPA requires a large amount of energy by distillation because relative volatility of water and IPA is close and IPA forms azeotrope with water at about 14 %(wt) of water. FAU type zeolite membrane is one of the strong candidates for the dehydration of IPA stream under the conditions containing fairly larger fractions of water. In the 2010 FY, we focused on the interaction between seed FAU zeolite particles, and between FAU zeolite seed particles and porous alumina support surface, in order to control of both the amount of seed loaded on the support and distribution of seed particles on the support surface and inside of surface. The ζ-potential of zeolite crystals and particle size measurements suggested that pH value control average size of seed particles in slurry. Capillary force during dip-coating procedure also governed the amount of zeolite seeds loaded on the surface of support. The FAU membrane highly separated water from IPA with a high water permeance (ca. 8 x10-7 mol m-2 s-1 Pa-1). No obvious influence of seeding conditions was observed for the water permeance through FAU membrane. The separation factor of water/IPA mixtures was substantially affected by the seeding conditions.

Regarding the dehydration of AcOH, in this FY2010, we successfully developed a mordenite-type zeolite membrane with a high water/AcOH permselectivity by controlling its microstructure. Orientation of mordenite crystals was controlled by the composition of hydrogel used for the secondary growth of seeds. We found that denser hydrogel gave c-oriented membrane while leaner hydrogel tended to result in randomly-oriented membrane.

The water permeances were above 10-7 mol-2 s-1 Pa-1 for both mordenite membranes before the introduction of AcOH. However, the water permeation through the c-oriented mordenite membrane was significantly hindered and decreased to about 3 x 10-8 mol-2 s-1 Pa-1 after the introduction of AcOH. On the other hand, water permeation through a randomly-oriented mordenite membrane was not so hindered and maintained high water permeance (>10-7 mol-2 s-1 Pa-1) even after the introduction of AcOH, possibly due to an exclusion of the entrance of AcOH into the membrane pores as explained below. The permeance of AcOH through the randomly-oriented mordenite membrane was negligible small, resulting in high water/AcOH separation selectivity (>25000). The randomly-oriented mordenite membrane did not allow the permeation of AcOH even in AcOH unary system where water was absent in the feed, indicating that molecular-sieving property of the narrow channels worked in the randomly-oriented mordenite membrane.
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