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Aiche filteration

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  • 1. LASENTEC The Scale-Up of Solid/Liquid Separations The Role of Particle Size Terry Redmond James Ward
  • 2. Common Definitions Filtrate Medium Filter Cake
  • 3. Common Definitions Medium Resistance (Rm) Pressure (Pi) Pressure (Pf) Cake Resistance (Rc)
  • 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. Common Definitions Filtrate Medium Filter Cake
  • 6. Common Definitions Filtrate Medium Filter Cake
  • 7. Common Definitions Where Rc = Cake Resistance Pf = Dry Mass of Particles A = Area  = Specific Cake Resistance Filtrate Medium Filter Cake
  • 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. Inverse Filter Leaf Test Vacuum Source Vacuum Adjust Vacuum Gauge Slurry Filter Media
  • 10. Inverse Filter Leaf Test t / V V
  • 11. Filter Blinding - The Role of Fines t / V V Run 1
  • 12. Inverse Filter Leaf Test t / V V Run 1
  • 13. Inverse Filter Leaf Test t / V V Run 1 Run 2
  • 14. Inverse Filter Leaf Test t / V V Run 1 Run 2
  • 15. Inverse Filter Leaf Test t / V V Run 1 Run 2 Run 3
  • 16. The Components of Alpha
  • 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. 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. Alpha and the Real World The mean particle size decreases by 32% as the cake resistance increases by 325+%
  • 20. Another Example
  • 21. Another Example
  • 22. Another Example
  • 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. Conclusions
    • Building from Filtration Theory we were able to determine why particles are important to filtration scale-up
    • By developing the idea of Media Resistance and Filter area we were able to investigate how fines increase filter time by blinding
    • By looking into the components of Specific Cake Resistance we were able to explain why PSD and cake compressibility are important
    • We confirmed the literature equations to real world data sets
  • 25. Acknowledgements
    • Ron Washburn and Jon Hokinson for IT work
    • Cheryl Thom for transportation of instrumentation
    • Everyone at Mettler Toledo Millersville for the use of facilities and equipment