Collect. Czech. Chem. Commun. 1989, 54, 3117-3123

Kinetics of adsorption of heptane on active carbon supersorbon

Vratislav Fajman and Zdeněk Sedláček

Department of Physical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


Kinetics of the adsorption of heptane under different pressures and at different temperatures has been studied. Correlation of data according to a second-order equation was used to calculate half-time of adsorbate transport in pores. The correlation equation involves the effect of the pressure in pores for one component adsorption. The half-time was calculated from the whole course of kinetic isotherm. The empirical two-constant dependence of the half-time on pressure can be used to determine the possible mechanism of adsorbate transport in pores. In the adsorbent-adsorbate system studied the activation energy of heptane transport is 80 per cent of the value of isoteric heat. By using the end points of individual kinetic isotherms, the equilibrium isotherms at temperatures 0, 30, and 70 °C were constructed and these were correlated by Dubinin equation for the first structure type. Isochronous isotherms in coordinates of Langmuir and Dubinin equation were also constructed.