LASENTEC The Scale-Up of Solid/Liquid Separations The Role of Particle Size Terry Redmond James Ward
Common Definitions Filtrate Medium Filter Cake
Common Definitions Medium Resistance (Rm) Pressure (Pi) Pressure (Pf) Cake Resistance (Rc)
Common Definitions (Rm) Pressure (Pi) Pressure (Pf) (Rc) Filtrate Velocity (v) Where Pi  = Initial Pressure Pf  = Final Pr...
Common Definitions Filtrate Medium Filter Cake
Common Definitions Filtrate Medium Filter Cake
Common Definitions Where Rc  = Cake Resistance Pf  = Dry Mass of Particles A  = Area    =  Specific Cake Resistance Filtr...
Common Definitions Where q  = Volumetric Flowrate A  = Filter Area v  = Filterate Velocity  P =  Pressure Drop     =  Sp...
Inverse Filter Leaf Test Vacuum Source Vacuum Adjust Vacuum Gauge Slurry Filter Media
Inverse Filter Leaf Test t / V V
Filter Blinding - The Role of Fines t / V V Run 1
Inverse Filter Leaf Test t / V V Run 1
Inverse Filter Leaf Test t / V V Run 1 Run 2
Inverse Filter Leaf Test t / V V Run 1 Run 2
Inverse Filter Leaf Test t / V V Run 1 Run 2 Run 3
The Components of Alpha
The Components of Alpha Where    = Specific Cake Resistance K  = Constant Sp  = Mean Particle Surface Area Vp =  Mean Par...
A Focus on Particle Size 524,000  µm 3 524,000  µm 3 Total volume 314,000  µm 2 31,400  µm 2 Surface area 10  µm 100  µm D...
Alpha and the Real World The mean particle size decreases by 32% as the cake resistance increases by 325+%
Another Example
Another Example
Another Example
A Focus on Particle Size (An 87% increase in Specific Cake Resistance) 37% Increase 1,161,800µm 3 847,800µm 2 Total Surfac...
Conclusions <ul><li>Building from Filtration Theory we were able to determine why particles are important to filtration sc...
Acknowledgements <ul><li>Ron Washburn and Jon Hokinson for IT work </li></ul><ul><li>Cheryl Thom for transportation of ins...
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Aiche filteration

  1. 1. LASENTEC The Scale-Up of Solid/Liquid Separations The Role of Particle Size Terry Redmond James Ward
  2. 2. Common Definitions Filtrate Medium Filter Cake
  3. 3. Common Definitions Medium Resistance (Rm) Pressure (Pi) Pressure (Pf) Cake Resistance (Rc)
  4. 4. Common Definitions (Rm) Pressure (Pi) Pressure (Pf) (Rc) Filtrate Velocity (v) Where Pi = Initial Pressure Pf = Final Pressure Rc = Cake Resistance Rm = Media Resistance  = Filtrate Viscosity
  5. 5. Common Definitions Filtrate Medium Filter Cake
  6. 6. Common Definitions Filtrate Medium Filter Cake
  7. 7. Common Definitions Where Rc = Cake Resistance Pf = Dry Mass of Particles A = Area  = Specific Cake Resistance Filtrate Medium Filter Cake
  8. 8. Common Definitions Where q = Volumetric Flowrate A = Filter Area v = Filterate Velocity  P = Pressure Drop  = Specific Cake Resistance c* = dry mass solid / vol filterate V = Volume  = Filtrate viscosity Filtrate Medium Filter Cake
  9. 9. Inverse Filter Leaf Test Vacuum Source Vacuum Adjust Vacuum Gauge Slurry Filter Media
  10. 10. Inverse Filter Leaf Test t / V V
  11. 11. Filter Blinding - The Role of Fines t / V V Run 1
  12. 12. Inverse Filter Leaf Test t / V V Run 1
  13. 13. Inverse Filter Leaf Test t / V V Run 1 Run 2
  14. 14. Inverse Filter Leaf Test t / V V Run 1 Run 2
  15. 15. Inverse Filter Leaf Test t / V V Run 1 Run 2 Run 3
  16. 16. The Components of Alpha
  17. 17. The Components of Alpha Where  = Specific Cake Resistance K = Constant Sp = Mean Particle Surface Area Vp = Mean Particle Volume  = Porosity of Filter Cake
  18. 18. A Focus on Particle Size 524,000 µm 3 524,000 µm 3 Total volume 314,000 µm 2 31,400 µm 2 Surface area 10 µm 100 µm Diameter 1000 particles 1 particle Total number B A
  19. 19. Alpha and the Real World The mean particle size decreases by 32% as the cake resistance increases by 325+%
  20. 20. Another Example
  21. 21. Another Example
  22. 22. Another Example
  23. 23. A Focus on Particle Size (An 87% increase in Specific Cake Resistance) 37% Increase 1,161,800µm 3 847,800µm 2 Total Surface Area Decrease 3.3% 96.7 µm 100.0 µm Volume mean diameter Decrease 87.7% 12.3 µm 100.0 µm Number mean diameter 0% 14,140,000 µm 3 14,140,000 µm 3 Total volume Increase 3700% 1026 particles 27 particles Total number Relative change After breakage of one particle Initial particle system
  24. 24. Conclusions <ul><li>Building from Filtration Theory we were able to determine why particles are important to filtration scale-up </li></ul><ul><li>By developing the idea of Media Resistance and Filter area we were able to investigate how fines increase filter time by blinding </li></ul><ul><li>By looking into the components of Specific Cake Resistance we were able to explain why PSD and cake compressibility are important </li></ul><ul><li>We confirmed the literature equations to real world data sets </li></ul>
  25. 25. Acknowledgements <ul><li>Ron Washburn and Jon Hokinson for IT work </li></ul><ul><li>Cheryl Thom for transportation of instrumentation </li></ul><ul><li>Everyone at Mettler Toledo Millersville for the use of facilities and equipment </li></ul>

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