Bumping behavior of a reactant solution during hydrothermal synthesis in a batch-type reactor studied using neutron radiography

黒野 泰平*; 高見 誠一*; 久保 正樹*; 栗田 圭輔  ; 飯倉 寛  ; 原山 勲  

Kurono, Taihei*; Takami, Seiichi*; Kubo, Masaki*; Kurita, Keisuke; Iikura, Hiroshi; Harayama, Isao

Supercritical water (SCW) is widely used as a reaction medium in various chemical processes; consequently, direct observation of reactants, including their phase and mixing behaviors under SCW conditions, has attracted significant interest. In this study, we visualized the behavior of water in a batch-type reactor during heating to supercritical conditions. A batch-type reactor with an elongated shape was used, and neutron radiography was applied to observe the behavior of water inside the reactor. The results show that water in a vertically oriented reactor exhibits bumping behavior at around 130C during heating, whereas no such behavior is observed when the reactor is positioned horizontally.