Int J Thermophys (2010) 31:2425–2439

  A New Simplified Local Density Model for Adsorption

  of Pure Gases and Binary Mixtures


  M. Hasanzadeh · M. R. Dehghani · F. Feyzi · B. Behzadi


  Adsorption modeling is an important tool for process simulation and

  design. Many theoretical models have been developed to describe adsorption data

  for pure and multicomponent gases. The simplified local density (SLD) approach is

  a thermodynamic model that can be used with any equation of state and offers some

  predictive capability with adjustable parameters for modeling of slit-shaped pores. In

  previous studies, the SLD model has been utilized with the Lennard–Jones potential

  function for modeling of fluid–solid interactions. In this article, we have focused on

  application of the Sutherland potential function in an SLD–Peng–Robinson model.

  The advantages and disadvantages of using the new potential function for adsorption

  of methane, ethane, carbon dioxide, nitrogen, and three binary mixtures on two types

  of activated carbon are illustrated. The results have been compared with previous models.

  It is shown that the new SLD model can correlate adsorption data for different

  pressures and temperatures with minimum error.

  Keywords Activated carbon · Adsorbed natural gas · Adsorption · Simplified local density · Sutherland potential function

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