The hydrodynamics of high liquid holdup airlift reactors have not been widely studied. In this work we study the riser of a reactor of this type, focussing on the inΒ―uence of the gas Β―ow rate and the submergence ratio on various hydrodynamic parameters: liquid circulation velocity, gas holdup, and g
Macromixing characteristics of gas-liquid jet loop reactors
β Scribed by H.-J. Warnecke
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 450 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0138-4988
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β¦ Synopsis
Measurements of liquid macromixing characteristics are reported for a half industrial scaled jet loop reactor operating with air-water mixtures. Based on a model of loop reactors with sections of different mixing behavior the single circulation dispersion coefficient can be split into its components caused by the riser and the downcomer. The dispersion coefficient of the riser is about 100 times greater than that of the downcomer. The addition of gas involves greater dispersions coefficients. The comparison of the mixing times of the JLR with those of stirred vessels leads t o the conclusion that the J L R is equivalent or even superior to stirred vessels.
π SIMILAR VOLUMES
The hydrodynamics and mass transfer, specifically the effects of gas velocity and the presence and type of solids on the gas hold-up and volumetric mass transfer coefficient, were studied on a lab-scale airlift reactor with internal draft tube. Basalt particles and biofilmcoated particles were used