Osbourne Reynolds 18421912

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Falling Drop Experiment
Liquid-Liquid Extraction
Martín Peña

• Helpers
• Mike Seaner
• Sean Curran

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Presentation Structure

• Background
• Objectives
• Equipment/Procedure
• Theory/Equations
• Results
• Conclusions
• Questions

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Background

• LLE a separation process, takes solubility of
  solutes in solvents that are immiscible
• Distribution coefficient determines the ratio of
  the concentration of the solute
• Toluene water are immiscible components, and
  acetic acid is solute

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Objectives

• Determine the effect of drop size on
• Terminal velocity
• Mass transfer coefficient
• Mass transfer rate
• Compare results to predictive equations

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Equipment Sketch
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Procedure
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Procedure
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Procedure - Titration
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Procedure - Titrations

• Determine
• CAA in column
• m, equilibrium distribution coefficient of Acetic
  Acid between Water and Toluene

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Theory and Equations

• Na- mass transfer rate (mol/s)
• Ki- mass transfer coefficient (cm/s)
• A- surface area of drop (cm2)
• C- concentration of AA (mol/L)
• Cw- concentration of AA in drop (mol/L)

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Predictive Equationsmass transfer coefficient

• Outside of drop

• Inside of drop

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Predictive Equationsmass transfer coefficient

• Overall mass transfer coefficient

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Predictive Equationsterminal velocity
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Data
Effect of Drop Size on Terminal Velocity, Vt
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Data
Effect of Drop Size on Mass Transfer Rate, Na
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Data
Effect of Drop Size on Overall Mass Transfer
Coefficient, K
Predicted Values
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Data
Effect of Drop Size on Overall Mass Transfer
Coefficient, K
Experimental Values
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Conclusions

• Terminal velocity increases with increasing drop
  size
• Mass transfer rate increases with increasing drop
  size
• Mass transfer coefficient decreases with
  increasing drop size
• Note As for this experiment, as the drop size
  increased, the mass transfer coefficient also
  increased

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