2010 Fiscal Year Final Research Report
Investigation on zeolite membrane performance deterioration during separation processes
| Project/Area Number |
20560709
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Properties in chemical engineering process/Transfer operation/Unit operation
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
INOUE Tomoya National Institute of Advanced Industrial Science and Technology, 集積マイクロシステム研究センター, 主任研究員 (20392590)
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| Co-Investigator(Kenkyū-buntansha) |
KIYOZUMI Yoshimichi 独立行政法人産業技術総合研究所, コンパクト化学システム研究センター, 主任研究員 (60356904)
NAGASE Takako 独立行政法人産業技術総合研究所, コンパクト化学システム研究センター, 主任研究員 (30357628)
HASEGAWA Yasuhisa 独立行政法人産業技術総合研究所, コンパクト化学システム研究センター, 研究員 (90392646)
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| Co-Investigator(Renkei-kenkyūsha) |
NISHIDE Toshikazu 日本大学, 工学部, 教授 (30297783)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 膜分離 / 劣化メカニズム / ゼオライト |
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| Research Abstract |
We prepared various kinds of zeolite membranes for hydrophobic nature as well as hydrophilic nature. Each membranes were evaluated mainly in pervaporation mode, using a real-time gas analyzer that we purchased by the grant. It revealed the performance decay profile for each membrane. The performance decay was due to hydrophilic transformation of zeolite crystalline composing the hydrophobic zeolite membrane by hydrolysis (for hydrophobic zeolite membrane) or hydrophilic transformation of zeolite crystalline composing the hydrophilic zeolite membrane by ion exchange (for hydrophilic zeolite membrane). For hydrophilic membrane we tested, such as philipsite, merlinoite, and chabazite, the zeolite framework was maintained during the contact by weak acid such as acetic acid, while close contact with strong protonic acid such as sulfonic acid deteriorated the framework. The membrane performance was recovered reversibly as long as the framework was maintained by ion exchange procedure. In this case, the membrane performance had been deteriorated due to protonated zeolite crystalline formation during the pervaporation operation in close contact with acidic solution.
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