2002 Fiscal Year Final Research Report Summary
Development of sonochmical reactor
| Project/Area Number |
12555211
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
化学工学一般
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| Research Institution | Nagoya University |
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Principal Investigator |
KODA Shinobu Grad.School of Eng., Nagoya Univ., Professor, 工学研究科, 教授 (10126857)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Masanori Honda Electronics Co.Ltd., 研究開発室, 室長
MATSUOKA Tatsuro Grad.School of Eng., Nagoya Univ., Associ.Professor, 工学研究科, 助教授 (60252269)
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| Project Period (FY) |
2000 – 2002
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| Keywords | sonochemical reator / micro bubble / oxidation of potassium iodide / batch operation / standing wave / residence time / effect of interface / volume dependence |
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| Research Abstract |
It is well known that high power ultrasound irradiation in the frequency range of 20kHz to 1Mhz leads to causes micro bubbles, where high temperature and high pressure reaction fields were generated. To apply this reaction field to the chemical engineering technology, we developed the sonochemical reactor, which has a volume of the some dm^<-3>. The sonochemical reactor with the maximum volume of 3.9 dm^<-3> was designed and constructed and oxidation in aqueous solution of 0.1M potassium iodide (KI) using the continuous flow ultrasonic reactor was investigated at the frequency of 132.2kHz. It is found out that there is the limiting value of yield of I_3^-. In this study, we estimated the rate constant of I_3^- in KI solution for the continuous flow ultrasonic reactor on the basis of the traditional modeling equation of the continuous flow reactor.
In the batch operation, the surface rise was observed above the transducer on sonication at the standing wave condition. The concentration of I_3^- under the free surface condition was larger than that obtained by using a reflector. This means that the sonochemical effect for free surface is enhanced. The results are interpreted in terms of the piston effect, which is induced by the fluctuation of surface and aeration.
The rate constant of I_3^- in the continuous flow ultrasonic reactor is larger than that in the batch one at a constant electric power. This means that sonochemical effect is enhanced for the continuous flow ultrasonic reactor. One reason is that the number of acoustic bubbles in solution may increase when the flow rate increases.
For the tallboy reactor was also developed and volume dependence of the reaction was investigated. The concentration of I_3^+ decreased with decreasing reaction volume with the power of -0.78.
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