Generation Rate Measurement Method for Attrition Crystal Fragments and Abraded Volume of Potassium Alum in a Stirred Vessel Filled with Anti-Solvent

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  • Misumi Ryuta
    Division of Materials Science and Chemical Engineering, Faculty of Engineering, Yokohama National University
  • Miyauchi Shota
    Department of Materials Science and Engineering, Graduate School of Engineering, Yokohama National University
  • Kato Konatsu
    Department of Chemistry, Chemical Engineering and Life Science, College of Engineering Science, Yokohama National University
  • Asahina Eri
    Department of Materials Science and Engineering, Graduate School of Engineering, Yokohama National University
  • Nishi Kazuhiko
    Department of Mechanical Engineering, Faculty of Engineering, Chiba Institute of Technology
  • Kaminoyama Meguru
    Division of Materials Science and Chemical Engineering, Faculty of Engineering, Yokohama National University

Bibliographic Information

Other Title
  • 非溶媒中での撹拌操作にともなうカリミョウバン結晶の摩耗微結晶生成量と母結晶摩滅量の定量化法の検討
  • ヒヨウバイ チュウ デ ノ カクハン ソウサ ニ トモナウ カリミョウバン ケッショウ ノ マモウ ビケッショウ セイセイリョウ ト ハハ ケッショウ マメツリョウ ノ テイリョウカホウ ノ ケントウ

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Description

<p>Stirring operations in a crystallizer often induce particle abrasion caused by particle–impeller collision, resulting in numerous attrition fragments. This study developed a method for measuring the size and total number of attrition crystal fragments in a stirred vessel filled with anti-solvent, using potassium alum as the model crystal based on image-processing algorithms of SEM images of attrition fragments. The abraded volume ratio of a parent crystal was also evaluated, based on the edge length of the regular octahedron of a single potassium alum crystal. Results showed that both the number of attrition fragments and the abraded volume of parent crystals initially increased rapidly and reached saturation after about 40 h. The conical parent crystal became rounded with stirring time, although its flat surfaces did not change to any great degree. The rate of attrition fragment generation, which is correlated with the abraded ratio of the parent crystal, decreased rapidly to a few tenths as the parent crystal became rounded.</p>

Journal

  • KAGAKU KOGAKU RONBUNSHU

    KAGAKU KOGAKU RONBUNSHU 44 (3), 147-152, 2018-05-20

    The Society of Chemical Engineers, Japan

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