A simplified model of hydrodynamics in airlift loop reactors |
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Authors: | U Onken M Träger |
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Institution: | 1. Abteilung Chemietechnik Lehrstuhl Technische Chemie B, Universit?t Dortmund, Postfach 500 500, D-4600, Dortmund 50, FRG
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Abstract: | As a function of the gas throughput the following parameters were measured in an external loop reactor with a riser diameter
of 0.6 m and a gassed liquid height of 8.6 m: integral and local values of gas hold-up; liquid velocities; mixing times and
axial dispersion coefficients of the liquid phase.
The height of the reactor could be altered by reconstruction. Measurements were also carried out with lower heights than 8.6
m. Besides pure water, aqueous solutions of coalescing, non-coalescing and viscosity-increasing substances were used as model
systems. With the results a general relationship between superficial gas velocity, gas hold-up and liquid velocity was established.
This hydrodynamic model uses the relative velocity between gas and liquid phase as the fundamental parameter. The generally
valid model consists of one term for the homogeneous and of two additional terms for the heterogeneous flow regime. |
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Keywords: | |
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