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Development of sonochmical reactor

声化学反应器的研制

基本信息

批准号：
12555211
负责人：
KODA Shinobu
金额：
$ 5.89万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555211/
关键词：
sonochemical reator micro bubble oxidation of potassium iodide batch operation standing wave residence time effect of interface volume dependence 最適高さ流通管式反応器有機塩素化合物ポルフィリン分解反応流通型反応器一次反応クロロベンゼン

项目摘要

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.

众所周知，在20 kHz至1 Mhz的频率范围内的高功率超声辐照导致产生微气泡，其中产生高温和高压反应场。为了将这一反应场应用于化工技术，我们开发了体积为若干立方厘米的声化学反应器<-3>。设计并建造了最大容积为3.9dm ~ 2的超声化学反应器<-3>，并在132.2kHz频率下对0.1M碘化钾水溶液进行了超声氧化实验。发现I_3^-的产率存在一个极限值。本文在传统的连续流超声反应器模型的基础上，估算了连续流超声反应器中I_3^-在KI溶液中的速率常数，在间歇操作中，在驻波条件下超声处理时，换能器上方观察到表面上升现象。在自由表面条件下的I_3^-浓度大于使用反射器获得的浓度。这意味着自由表面的声化学效应增强。结果表明，在恒定功率下，连续流超声反应器中I_3^-的速率常数大于间歇式超声反应器中I_3^-的速率常数，而间歇式超声反应器中I_3^-的速率常数大于间歇式超声反应器中I_3^-的速率常数。这意味着连续流超声反应器的声化学效应增强。原因之一是，当流速增加时，溶液中的声气泡数量可能会增加。我们还开发了高脚反应器，并研究了反应的体积依赖性。I_3^+浓度随反应体积的减小而减小，其幂函数为-0.78。