成果報告書詳細
管理番号20110000001162
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(5)
公開日2011/8/30
報告書年度2010 - 2010
委託先名学校法人芝浦工業大学
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 <膜修復技術の確立> ゼオライト膜の修復技術を確立するために、本年度は、以下の項目について検討を行った。 1) 高温CVDに用いる反応種の選定 昨年度の検討より、CVDのシリカ源としてpropyltrimethoxysilane(PrTMOS)が優れていることがわかった。そこで、本年度は、PrTMOS分解物の熱安定性を検討した。PrTMOSの蒸着物を代表する物質として、PrTMOSの加水分解物を用いた。
英文要約Zeolite membranes have been developed for water permselective membranes from alcohol aqueous solution such as an IPA/water solution. There are two pathways through zeolite membranes. One is intracrystalline pathways that molecules pass through the inside of zeolite pores, other is intercrystalline pathways that molecules pass through the outside of zeolite crystals. In this year, the high temperature CVD method was applied to modify MOR zeolite membranes, and permeation properties of IPA/water pervaporation were discussed. MOR membranes were synthesized on porous alfa-alumina substrates (NA-1). CVD was carried out at 550 °C for 100 min. O2 was introduced into the inside of the membrane at the rate of 0.2 L min-1. PrTMOS was provided through a N2 bubbler kept at 45 °C. IPA/water PV was carried out at 75 °C. The deposited silica by the CVD shows hydrophobic properties. However, propyl groups on the deposited silica are decomposed by the N2 post treatment at 550 °C. After the N2 post treatment, silica surface is hydrophilic. First, stability of alkyl groups on silica was investigated using a powder sample. Alkyl groups on silica surface were quite stable under 300 °C of O2 atmosphere. Next, thermal stability of a MOR membrane under the CVD condition was tested. MOR structures were confirmed after the CVD treatment by using an XRD measurement. Two types of the MOR membranes were tested. One is low water permselective membrane (selectivity: 4.4). The other is slightly higher permselective membrane (selectivity: 31). Water selectivity increased from 4.4 to 31 at 0.70 of the feed water activity through the low permselective membrane (selectivity: 4.4). Pinholes of the as-made MOR membrane were successfully filled by the treatment. The slightly higher MOR membrane (selectivity: 31) was examined. After the CVD treatment, water selectivity decreased from 31 to 25. However, water selectivity increased from 25 to 106 by the N2 post treatment. Hydrophilic silica surface improve the membrane permselectivity.
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