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Studies on the hydrodynamic behavior and mass transfer in a down‐flow jet loop reactor with a coaxial draft tube
Author(s) -
Jamshidi Amir Masoud,
Sohrabi Morteza,
Vahabzadeh Farzaneh,
Bonakdarpour Babak
Publication year - 2001
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/1097-4660(200101)76:1<39::aid-jctb331>3.0.co;2-8
Subject(s) - nozzle , draft tube , residence time distribution , mechanics , coaxial , bubble , jet (fluid) , volumetric flow rate , mass transfer , chemistry , tracer , contactor , mass transfer coefficient , discharge coefficient , flow (mathematics) , thermodynamics , nuclear physics , physics , mechanical engineering , power (physics) , engineering
The effects of certain pertinent parameters such as gas and liquid flow rates and nozzle position on the behavior of a down‐flow jet loop reactor (DJR) have been studied. The mean residence times of gas and liquid phases and the gas holdup within the reactor have been measured. In addition, the overall volumetric mass transfer coefficient, and the influence of the gas flow rate and the position of the nozzle inside the draft tube on the latter has been determined. Correlations have been presented for the gas holdup and k L a which take into account the length of the draft tube and the nozzle immersion height. The k L a values obtained at different power per unit volume ( P/V ) values in the DJR used in the present study compare favorably with data presented for stirred tanks and bubble columns in the literature. The liquid residence time distribution (RTD) within the reactor has been studied by tracer analysis for various operating conditions and nozzle immersion height and the results are indicative of the high mixing intensities that can be obtained in such reactions. © 2001 Society of Chemical Industry