Analysis of Dynamic Behavior of Dispersed Phase by Ultrasound in Multiphase Processes

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05212
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 27020:Chemical reaction and process system engineering-related
• Research Institution: Tokyo Denki University
• Principal Investigator: Kobayashi Daisuke 東京電機大学, 工学部, 教授 (30453541)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: ソノプロセス / 乳化 / ポリマー微粒子 / 速度論解析 / 有機物分解

Outline of Final Research Achievements

A crude emulsion of O/W system was prepared and then irradiated with ultrasound. The polymerization reaction was progressed with heating and stirring, and the particle size and yield were measured. The particle size was not significantly affected, but the yield was divided into conditions where the reaction progressed to nearly 100% and conditions where the reaction progressed to only 80%, suggesting that some droplets may have agglomerated or merged with each other when the crude emulsion was irradiated with ultrasound.
We also conducted an ultrasonic degradation reaction of phenol in the presence of titanium dioxide particles to investigate the effect of the relationship between particle size and ultrasonic frequency on the activation of the reaction field. It was suggested that the relationship between the size of the added particles and the resonance diameter affects the activation of the reaction field.

Free Research Field

反応工学

Academic Significance and Societal Importance of the Research Achievements

超音波の化学的効果を用いた重合に対し、高分子分解が研究されたり、超音波の物理的効果を用いたナノエマルション調製に対し、マニピュレーション効果による細胞などの凝集・濃縮や、ファインバブルの凝集による浮上分離が研究されており、相反する現象に超音波を用いた研究が多くある。
高分子重合・分解反応においては、利用する周波数や超音波強度が系を制御するための重要な因子である。また、多相系での分散・凝集おいては、分散相の大きさと周波数の関係が系を制御するための重要な因子である。これらを統計的にまとめて、対象系で目的を達成するための操作条件のマッピングが超音波プロセスの実用化のために重要であると考えられる。