水選択透過性CHA型ゼオライト膜を用いたイソプロピルアルコール/水混合蒸気の循環式連続脱水における二段促進濃縮法  [in Japanese] Two-Step Enhanced Dehydration of IPA-Water Vapor Mixture using Water-Selective CHA Zeolite Membrane in Continuously Recycling System  [in Japanese]

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Author(s)

    • 伊藤 直次 Itoh Naotsugu
    • 宇都宮大学大学院工学研究科 物質環境化学専攻 Department of Material & Environmental Chemistry, Graduate School, Utsunomiya University
    • 徳永 瑞美 Tokunaga Tamami
    • 宇都宮大学大学院工学研究科 物質環境化学専攻 Department of Material & Environmental Chemistry, Graduate School, Utsunomiya University
    • 佐藤 剛史 Sato Takafumi
    • 宇都宮大学大学院工学研究科 物質環境化学専攻 Department of Material & Environmental Chemistry, Graduate School, Utsunomiya University

Abstract

共沸蒸留を伴うイソプロピルアルコール(IPA)脱水の省エネルギー化として膜分離法の導入が期待されている.本研究ではCHA型ゼオライト膜に注目し,連続的にIPAを脱水し濃縮する循環式連続脱水試験における濃縮時間短縮を目的に合成条件の最適化を行った.H<sub>2</sub>O/IPA分離係数の高い膜を用いて連続脱水を行うとIPA回収率は高いものの,濃縮に多くの時間を必要とした.そこで,膜性能が操作温度によって変化することに着目し,濃縮の途中で低温から高温への昇温操作を伴う二段法を提案した.その結果,濃度分極の低減によって濃縮時間の大きな短縮を達成できることを解析的かつ実験的に示した.

Membrane dehydration of isopropyl alcohol (IPA) is an attractive alternative to azeotropic distillation in terms of energy saving. First, the optimal conditions for synthetic of CHA zeolite membrane on porous alumina tubes was explored to shorten the enrichment time in a continuously recycled dehydration for IPA–water vapor mixture. Second, it was found that use of a membrane with higher water-selectivity raised the IPA recovery rate but required a longer enrichment time. It was also found that the water permeability of the membrane increased while the selectivity decreased with increasing temperature, and accordingly the operation temperature was increased in two steps, from 100 to 140°C. As a result, concentration polarization was suppressed and the enrichment time was significantly reduced.

Journal

  • KAGAKU KOGAKU RONBUNSHU

    KAGAKU KOGAKU RONBUNSHU 42(1), 8-14, 2016

    The Society of Chemical Engineers, Japan

Codes

  • NII Article ID (NAID)
    130005120562
  • NII NACSIS-CAT ID (NCID)
    AN00037234
  • Text Lang
    JPN
  • ISSN
    0386-216X
  • NDL Article ID
    027221215
  • NDL Call No.
    Z17-725
  • Data Source
    NDL  J-STAGE 
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