成果報告書詳細
管理番号20110000001568
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(11)
公開日2011/12/13
報告書年度2010 - 2010
委託先名三菱化学株式会社
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 (1)分離膜製造基盤技術の開発
・平成21年度の検討において、耐水性、耐酸性を評価したモルデナイト(MOR)型ゼオライトの製膜条件を10cm長の短管により検討した。
早稲田大学にて明らかにされた水熱合成組成(Na2O:Al2O3:SiO2:H2O)中の水分率によるMOR膜の配向性の制御と膜透過性能の関係に関する検討結果を踏まえ、同組成で膜を試作し、蒸気透過(Vapor Permeation;VP)法で120~150度のプロセス温度条件での膜の透過性能を評価した。
その結果、早稲田大学報告の通りの膜配向性を示し、同等の結果が得られる事を確認した。 Na2O:Al2O3:SiO2:H2O=10:0.15:36:440では、イソプロパノール(IPA)に対する脱水透過流束は高いが、酢酸に対しては透過流束が低下し、逆に、Na2O:Al2O3:SiO2:H2O = 10:0.15:36:960は酢酸脱水に対して高い水透過度および分離係数を示した(酢酸/水=90/10wt%のフィード組成で120度におけるVPモードでの水透過度Kw=3.7×10-7(mol/m2・s・Pa)、分離係数α=759)。 この結果は、酢酸に対する脱水性能の最終目標値を上回る結果である。
英文要約 (1)The development of the fundamental technologies for membrane manufacture; We studied the synthesis condition of the Mordenite(MOR) zeolite membrane with the length of 10cm which evaluated its water resistance and its acidic resistance. The water composition in hydrothermal synthesis affects the permeability of the synthesized membrane. The membrane which synthesized with a composition of 10Na2O:0.15Al2O3:30SiO2:440H2O has high water flux to the dehydaration of 2-propanol (IPA). The other hand, the membrane which synthesized with a composition of 10Na2O:0.15Al2O3:30SiO2:960H2O has good permeating properties under acidic condition. The quality of synthesized membrane was examined by vapor permeation (VP) at 120 °C in a feed mixture of acetic acid (90wt.%) /water (10wt.%), resulting in water pearmeance of 3.7X10-7(mol m-2 sec-1 Pa-1) and separation factor of 759. We prepared chabazite (CHA) structure high-silica membrane. The silica/alumina ratio in the composition of synthesized CHA membrane is over 10. It could be expected that CHA membrane has high-water resistance. The quality of synthesized CHA membrane was examined by vapor permeation (VP) at 130°C in a feed mixture of IPA (50wt.%) /water (50wt.%), resulting in water pearmeance of 1.7X10-6(mol m-2 sec-1 Pa-1) and separation factor of 759. This result is higher than MOR type membrane. We examined a MOR/MFI hybrid type membrane as a candidate that could be applied to dehydration under acidic condition. A distribution of MFI zeolite in this membrane is an asymmetry, it consist of a thin upper layer of MOR zeolite and a under layer with a mixture of MOR zeolite and MFI zeolite. It has expected that this membrane could have both the acidic resistance of MOR and the high permeability ability of MFI. The quality of synthesized MOR/MFI hybrid membrane was examined by VP at 130 °C in a feed mixture of acetic acid (40wt.%) /water (60wt.%), resulting in water pearmeance of 4.7X10-7(mol m-2 sec-1 Pa-1) and separation factor of 419. This result is higher than MOR membrane. We prepared MOR membranes with 80cm long for using in practical industrial processes. Its permeability evaluated by PV at 75 °C in a feed mixture of IPA (90wt.%) /water (10wt.%) and by PV at 75 °C in a feed mixture of acetic acid (50wt.%) /water (50wt.%). The dehydration property of 80cm MOR membrane for IPA solvent was water pearmeance of 2.5X10-7(mol m-2 sec-1 Pa-1) and separation factor of 125. The dehydration property for acetic acid solvent was water pearmeance of 2.5X10-7(mol m-2 sec-1 Pa-1) and separation factor of 125. These results exceed our final goal of membrane permeating properties for acetic acid solvent. (2)The development of the technology of modules; We made CFX model to simulate the fluid dynamics in a module used in practically dehydration process with LTA zeolite membrane. We simulated a dehydration process in this module. When a dehydration of a mixture of ethanol(90wt.%)/water(10wt%) was carried out by VP at 130°C, the concentration of ethanol after the dehydration was 99.9wt.%. At next year, it will be confirmed by comparison between the simulation and the experimental data of LTA membrane. And we will optimize the modular structure.
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