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Hydrodynamic and Mass Transfer Parameters in Agitated Reactors Part I: Critical Mixing Speed, Induced Gas Flow Rate, and Wavy Surface in SARs and GIRs

  • Romain Lemoine , Benoit Fillion and Badie I Morsi
Published/Copyright: November 8, 2004
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 2 Issue 1

The critical mixing speed for gas entrainment (NCRE), for gas induction (NCRI), induced gas flow rate (QGI) as well as the wavy gas-liquid interfacial area (aWave) of N2 and air were measured in pure toluene and three mixtures of organic liquids (toluene-benzoic acid-benzaldehyde mixtures) under wide ranges of temperatures, T (300-453K), pressures, P (1-15 bar), mixing speeds, N (13.3-23.3Hz) and liquid heights, H (0.171-0.268m) using a 4-liter, see-through agitated autoclave operating as a surface-aeration reactor (SAR) and gas-inducing reactor (GIR).NCRE and NCRI as well as aWave were estimated by analyzing the videos taken with an on-line high-speed Phantom camera through the reactor’s Jerguson windows. In the GIR, QGI was determined using a highly sensitive Coriolis mass flow meter. The Central Composite Statistical Design and analysis technique was used to study the effect of operating conditions on these hydrodynamic parameters.NCRE and NCRI appeared to increase with liquid height and decrease with temperature, whereas, the pressure and gas nature did not significantly affect both parameters. The liquid physicochemical properties were found to strongly affect NCRE and NCRI, and QGI. Increasing mixing speed or decreasing liquid height increased QGI. Increasing temperature or decreasing liquid viscosity initially increased and then decreased QGI. Increasing pressure or gas density on the other hand decreased QGI. Increasing mixing speed and temperature or decreasing liquid height significantly enhanced aWave, as compared to the flat liquid surface. At high pressures, however, lower values of aWave were obtained. Empirical and statistical correlations were also developed to accurately predict NCRE, NCRI, QGI and aWave.

Keywords: Absorption; Hydrodynamics; Agitated Reactors; Critical Mixing Speed; Induced Gas Flow Rate
Published Online: 2004-11-8

©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston

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https://doi.org/10.2202/1542-6580.1155
Keywords for this article
Absorption; Hydrodynamics; Agitated Reactors; Critical Mixing Speed; Induced Gas Flow Rate

Articles in the same Issue

  1. Review
  2. Industrial Applications of Reactive Distillation: Recent Trends
  3. Phase Mixing Modeling in Multiphase Reactors Containing Gas Bubble: a Review.
  4. Article
  5. Numerical Aspects of Bubble Column Simulations
  6. Reactor Operating Strategy and Secondary Nucleation in Emulsion Polymerization
  7. Combined Mechanistic and Empirical Modelling
  8. The Catalytic Evaluation of Structured Zeolite Catalysts
  9. A Mechanistic Model for the Water Gas Shift Reaction Over Commercial Catalysts Containing CuO/ZnO
  10. Catalytic Pyrolysis of Difluorochloromethane to Produce Tetrafluoroethylene
  11. Radial Profiles of Particle Velocity in a Large Scale CFB Downer
  12. Nonlinear Dynamic Analysis of the Local Heat Transfer Rate in Three-Phase Reactors
  13. Conversion of Synthesis Gas into Light Hydrocarbons. Modelling of the Catalytic Reaction Network
  14. Influence of the Preparation Method and Metal Precursor Compound on Alumina-Supported Pd Catalysts
  15. A 3D Model of Combustion in Large-Scale Circulating Fluidized Bed Boilers
  16. Gas and Solid Mixing in High-Density CFB Risers
  17. A Local Model for Gas-Liquid Mass Transfer in a Gas-Liquid-Solid Circulating Fluidized Bed
  18. A Hybrid Methodology For On-Line Process Monitoring
  19. A Laboratory Steam-Cracking Reactor to Characterize Raw Materials
  20. Modeling, Simulation and Optimal Control of Ethylene Polymerization in Non-Isothermal, High-Pressure Tubular Reactors
  21. A Parametric Study of the Oxygen Elimination Process in a Packed Bed
  22. Flow Generated by Radial Flow Impellers: PIV Measurements and CFD Simulations
  23. Enhanced Reactor Performance with Pressure and Vacuum Swing Reaction
  24. Characterization and Selection of Materials for Air Biofiltration in Fluidized Beds
  25. Control and Optimization of a Three Phase Industrial Hydrogenation Reactor
  26. Horizontal Penetration of Gas-Liquid Spray Jets in Gas-Solid Fluidized Beds
  27. Optimization of Flow Shear Stress Through a Network of Capillary Fibers With the Use of CFD
  28. Oxygen Distribution in Packed Bed Membrane Reactors For Partial Oxidation Systems and its Effect On Product Selectivity
  29. Wastewater Minimisation Using a Heuristic Procedure
  30. Characterization of Fluidization Quality in Fluidized Beds of Wet Particles
  31. Numerical and Experimental Investigations into The Effect of Gap Between Baffle and Wall on Mixing in an Oscillatory Baffled Column
  32. Alternative Designs for Fixed Bed Catalytic Reactors
  33. Hydrodynamic and Mass Transfer Parameters in Agitated Reactors Part I: Critical Mixing Speed, Induced Gas Flow Rate, and Wavy Surface in SARs and GIRs
  34. Application of CFD Modelling Technique in Engineering Calculations of Three-Phase Flow Hydrodynamics in a Jet-Loop Reactor
  35. 3-D Modeling of Liquid Injection into Fluidized Beds
  36. Conference Presentation
  37. Granular Flows and Gas Fluidization
  38. Elastic Granular Flows
  39. Multi-fluid CFD modelling of fluidised bed reactors
  40. Chemical Reaction Engineering, the Environment, Pollution Prevention and Sustainable Development
  41. Gas-Liquid-Solid Fluidization: Perspectives
  42. Short Communication or Note
  43. Catalytic Drying of Digested Sludge
  44. Enhancement of the Distribution of a Liquid Sprayed Into a Fluidized Bed
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