The Freundlich Isotherm in Studying Adsorption in Oil Processing Chapter uri icon

abstract

  • This chapter discusses the history of the use of the Freundlich isotherm in investigating the adsorption processing of vegetable oils and evaluates its current value in adsorption studies. Adsorption is a physical chemical process involving the mass transport of an adsorbate from the solution phase to the interior surface of the porous adsorbent where the adsorption occurs. The Freundlich isotherm was originally developed to explain the adsorption of a single solute from a solution. However, a similar adsorption pattern was observed when studying a more complex system of adsorption of vegetable oil pigments onto bleaching clay during the commercial bleaching of vegetable oils. The Freundlich isotherm has been useful for decades in determining the commercial value of adsorbents providing a narrow experimental interval of adsorbate is used. The Freundlich equation states that, at a constant temperature, the amount of adsorbate bound per unit weight of adsorbent, Qe (adsorption efficiency of the adsorbent) is a logarithmic function of the residual concentration in the fluid phase at equilibrium, Ce. At low-solute concentrations, the amount of adsorbate adsorbed increases greatly with an increase in solution concentration. © 2009 by the American Oil Chemists%27 Society. All rights reserved.
  • This chapter discusses the history of the use of the Freundlich isotherm in investigating the adsorption processing of vegetable oils and evaluates its current value in adsorption studies. Adsorption is a physical chemical process involving the mass transport of an adsorbate from the solution phase to the interior surface of the porous adsorbent where the adsorption occurs. The Freundlich isotherm was originally developed to explain the adsorption of a single solute from a solution. However, a similar adsorption pattern was observed when studying a more complex system of adsorption of vegetable oil pigments onto bleaching clay during the commercial bleaching of vegetable oils. The Freundlich isotherm has been useful for decades in determining the commercial value of adsorbents providing a narrow experimental interval of adsorbate is used. The Freundlich equation states that, at a constant temperature, the amount of adsorbate bound per unit weight of adsorbent, Qe (adsorption efficiency of the adsorbent) is a logarithmic function of the residual concentration in the fluid phase at equilibrium, Ce. At low-solute concentrations, the amount of adsorbate adsorbed increases greatly with an increase in solution concentration. © 2009 by the American Oil Chemists' Society. All rights reserved.

publication date

  • 2009-01-01