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Received December 8, 2000
Accepted February 17, 2001
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Hydrodynamic and Mass Transfer Characteristics of External-Loop Airlift Reactors without an Extension Tube above the Downcomer
Department of Chemical Engineering, Hanbat National University, San 16-1, Dukmyung-dong, Yuseong-gu, Daejeon 305-719, Korea
khchoi@hanbat.ac.kr
Korean Journal of Chemical Engineering, March 2001, 18(2), 240-246(7), 10.1007/BF02698466
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Abstract
The effects of the horizontal connection length (0.1≤L(c)≤0.5 m), the downcomer-to-riser cross-sectional area ratio (0.11≤A(d)/A(r)≤0.53) and the superficial gas velocity (0.02≤U(G)≤0.18 ms(-1)) on gas holdups in the riser and downcomer, the circulation liquid velocity, the mixing time, and the overall volumetric mass transfer coefficient were determined in external-loop airlift reactors without an extension tube above the downcomer [configuration (a)]. For otherwise fixed conditions, the absence of the extension tube strongly affected the hydrodynamic and mass transfer characteristics of external-loop airlift reactors. In contrast with the external-loop airlift reactor with the extension tube [configuration (b)], a large air pocket formed in the top horizontal connection and the surface aeration took place in the external-loop airlift reactor without the extension tube [configuration (a)]. As a result, the riser circulation liquid velocity in configuration (a) was slower than that in configuration (b). The riser and downcomer gas holdups, the mixing time and the overall volumetric mass transfer coefficient in configuration (a) were larger than those in configuration (b), respectively.
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Merchuk JC, Stein Y, AIChE J., 27, 377 (1981)
Merchuk JC, Chem. Eng. Sci., 41, 11 (1986)
Park CJ, Korean J. Chem. Eng., 16(5), 694 (1999)
Petrovic DLJ, Posarac D, Dudukovic A, Chem. Eng. Commun., 133, 1 (1995)
Popovic M, Robinson CW, Biotechnol. Bioeng., 32, 301 (1988)
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