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  • 一般

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    • Professor Seki retired from Hokkaido University in March, 2024.

  • Particle size and separation methods


  • Filtration resistance

    • 'Filter medium'（filter paper, filter plate）


      'Filter residue'（cake）


    • There are two kinds of filtration resistance.


    • Rc : Resistance of filter residue (cake) 

      When "cake thickness" is proportional to "filtrate volume


  • Lewis basic formula of filtration


  • Filtration at a constant rate (Filtration pressure varies.)



  • Filtration at a constant pressure：Ruth formula (Filtration rate varies.)



  • Gravity filtration: Filtration rate and pressure change simultaneously.



    • How to find the resistance coefficient of filter medium

      When filtering water, the specific resistance of the filter media α = 0


  • Experimental filtration of squid liver lysate


    • Andrade plot of squid liver lysate (temperature vs. viscosity)


    • Analysis of filtration experiments of squid liver lysate


  • Experimental formula for determining the Stokes diameter of a molecule

    • Proteins, etc.: 0.076 MW0.4 (Schnabel, R et al., J. Membrane Sci., 36, 55-66, 1988 ) 


      Dextran: 0.0542 MW0.498 (Kubin, M and Vozka, S, J. Polym. Symp. 68, 209-213, 1980) 


      Polyethylene oxide: 0.0332 MW0.576 (Kubin, M and Vozka, S, J. Polym. Symp. 68, 209-213, 1980) 


      Polyethylene glycol: 0.0542MW0.517 (Kubin, M and Vozka, S, J. Polym. Symp. 68, 209-213, 1980) 


      ※Molecular Weight (MW) 


      ※Unit: nanometer

  • Data measured on glass filters (Schnabel et.al, 1988)


  • Data measured on ultrafiltration membranes (Porter & Michaels, 1971)


  • Solute pore passage probability: Φ

    • Zeman-Wales formula



  • Filter press