Different Adsorption Coefficients in the Zones

As the adsorption equilibrium in SFC is dependent on density, the application of a pressure gradient along the zones of the process can be used for a directed 

For the change of the linear adsorption coefficients Kj on density Mazzotti et al. [26] suggested  

Thereby, K o is the linear adsorption coefficient at a reference density po- With it, the linear adsorption coefficient fCj can be calculated for any density p from the information of a reference state. The exponent hi is an empirical parameter, which can be obtained from experimental data. Typical values for hi are in the range 

As a consequence, the adsorption coefficients for a component i in the four zones 1 to 4 meet the inequality  

If the method of the triangle theory is applied in this case, the region of complete separation can be determined in the same way as described before. However, the shape of the region of complete separation changes. 

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