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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 7, 2001
Accepted August 17, 2001

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Diagnosis of Bubble Distribution in a Three-Phase Bubble Column Reactor for Dehydration of Ortho-Boric Acid

Sa Jung Kim Yong Jun Cho Chan Gi Lee Yong Kang^† Sang Done Kim¹

Department of Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea ¹Department of Chemical Engineering, KAIST, Daejeon 305-701, Korea

Korean Journal of Chemical Engineering, January 2002, 19(1),
10.1007/BF02706892

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Abstract

For the practical application of a three-phase bubble column as a reactor in the dehydration of ortho-boric acid, we investigated the bubble distribution and its effects on the reaction in a three-phase bubble column reactor (0.102 m ID×2.0 m in height) operating at relatively low pressure (below the atmospheric pressure). Effects of reaction time, temperature, gas velocity, particle size and gas injection mode (even, wall-side, central and asymmetric distribution)_x000D_ on the fractional conversion of the reaction were determined. The complicated bubble distribution as well as bubbling phenomena in the reactor were diagnosed and interpreted by means of the attractor trajectories and correlation dimension which were obtained from the resultant pressure fluctuations. The fractional conversion was closely related to the attractor shape or correlation dimension of the pressure fluctuations in the reactor. The fractional conversion in the case of even distribution of gas injection exhibited the highest value in all cases studied, at which the attractor of pressure fluctuations was less scattered in the phase space, while their correlation dimension had the lowest value. When the gas was injected by means of wall-side distribution, the conversion level was higher than that in case of central or asymmetric distribution mode. Although a fluid-solid heterogeneous reaction model can be applicable to the reaction, deviations from the model become considerable when the gas injection mode changes from even to wallside, central or asymmetric mode, orderly.

Keywords

Dehydration Boric Acid Bubble Distribution Pressure Fluctuations Chaos Analysis Three Phase Bubble Column Reactor

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