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Fine Powder Processing of Alkoxide Method by Using Three-Phase Reactor

Research Project

Project/Area Number 03650760
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 化学工学
Research InstitutionUniversity of Tokyo

Principal Investigator

YOSHIDA Kunio  University of Tokyo, Dept. of Chem. Eng., Professor, 工学部, 教授 (70010808)

Co-Investigator(Kenkyū-buntansha) AIHARA Masahiko  University of Tokyo, Dept. of Chem. Eng., Research Associate, 工学部, 助手 (00221705)
TSUTSUMI Atsushi  University of Tokyo, Dept. of Chem. Eng., Lecturer, 工学部, 講師 (00188591)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsalkoxide / three-phase reactor / fine particles / titanium dioxide / アルコキシド法 / 微粒子
Research Abstract

The alkoxide method is used to prepare alkaline-earth perovskite ceramics with complex compositions. In this study, a novel process of fine powder production named as "three-phase alkoxide method" has been developed, which is the precipitation in a three-phase bubble column by injecting steam gas. The morphology of particles formed from the hydrolysis of titanium tetraisopropoxide and the reaction mechanism have been studied. The relationship between the particle size and the operation conditions was investigated.
In conclusion:
1) The increase of steam feed rate in the three-phase alkoxide method promotes hydrolysis reaction and raises the yield of the products.
2) An additional supply of steam promotes particle growth without the secondary nucleation, leading to narrow particle size distribution.
3) The rapid hydrolysis of alkoxide is caused by the additional injecting of steam. The subsequent condensation reaction between Ti-OH groups takes place, leading to the formation of a highly cross-linked Ti-O network and he particle growth.
4) In addition, a structural model for predicting axial solid concentration profile in three- phase reactors is presented. The solid concentration in the wake is a controlling factor for determining axial solid concentration profiles.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] TSUTSUMI,A.,: "Prediction of Solid Concentration Profiles in Three-Phase Reactors by a wake Shedding Model" Chem.Eng.Sci.47. 3411-3418 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Atsushi Tsutsumi, Tawatchai Charinpanitkul and Kunio Yoshida: "Prediction of Solid Concentration Profiles in Three-phase Reactors by a Wake Shedding Model" Chem. Eng. Sci.47. 3411-3418 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tsutsumi,A.: "Prediction of Solid Concentration Profiles in Three-Phase Reactors by a Wake Shedding Model" Chem.Eng.Sci.47. 3411-3418 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 相原 雅彦: "三相アルコキシド法によるセラミックス微粒子合成における水蒸気供給条件の影響" 化学工学会第24回秋季大会講演要旨集. 0113 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 菊地 隆司: "三相アルコキシド法によるチタニア微粒子合成ー水蒸気供給条件による形状制御ー" 化学工学会第57年会. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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