CR2BK04 GLS Multiphase Reactors Content

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CR2BK04 G/L/S Multiphase Reactors Content

• Introduction
  1/2 hour
• General summary 1/2 hour
• Stirred Slurry Reactor 2 hrs
• Slurry Bubble Column 3
  hrs
• Trickle Bed Reactor 3
  hrs
• -configuration, flow regimes
  
• -correlations mass heat transfer
• -modelling, design

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CR2BK04 G/L/S Multiphase Reactors
Introduction, applications

• Functional difference
• Ggas scrubber, reactant e.g.oxidation,
  hydrogenation, reactive destillation,
• inert for flotation, mixing etc.
• Lsolvent, reactant, heat removal
• Sinert contact surface, catalyst,
• reactant, dissolution, crystallization

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CR2BK04 G/L/S Multiphase Reactors
Introduction, applications

• Three-phase catalytic reactors, Ramachandran and
  Chaudhari WenST BIBL. JNR 83 RAM,
  chap. 1 12
• fat hardening
• hydrodesulfurisation
• hydrocracking
• Fischer-Tropsch synthesis
• glucose hydrogenation
• fine-chemical oxidations
• etc. etc. etc.

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CR2BK04 G/L/S Multiphase Reactors
Introduction, configurations
Thousands of possible combinations
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CR2BK04 G/L/S Multiphase Reactors Introduction

• Reactors NOT treated
• 3-phase fluidised bubble column
• bubble column with downward flow
• loop reactors
• structured packings for GL
• counter-current fixed bed reactors
• spray towers
• tray columns
• membrane reactors
• electrochemical reactors
• centrifugal reactors
• . etc.

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CR2BK04 G/L/S Multiphase ReactorsIntroduction

• Important design parameters for a
  gas-liquid-solid reactor (Shah 1979)
• Flow regime, directions and uniformity
• (co-current, counter-current, cross flow)
• Pressure drop
• Holdups of various phases
• Residence-time distribution and axial mixing
• Gas-liquid mass and heat transfer
• Liquid-solid mass and heat transfer
• Intraparticle mass and heat transfer
• Wall heat transfer
• Intrinsic kinetics

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CR2BK04 G/L/S Multiphase ReactorsIntroduction
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CR2BK04 G/L/S Multiphase ReactorsIntroduction
Trambouze
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CR2BK04 G/L/S Multiphase ReactorsIntroduction
Trambouze
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CR2BK04 G/L/S Multiphase ReactorsIntroduction

• Goal
• global design of
• -STR or SBC (home work)
• -TBR (final assignment)
• catalytic oxidation of glucose
• mass transfer ? volume
• heat transfer ? surface
• energy dissipation ? power

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CR2BK04 G/L/S Multiphase ReactorsIntroduction

• Economical optimisation
• (in case of mass transfer controlled reaction)
• Minimize costs for
• Catalyst (more catalyst ? lower volume)
• Power (more power ? lower volume)
• Equipment (lower volume ? lower cost)