ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Nonisothermal adsorption in a fixed bed of adsorbent

S. Kachaňák, V. Khandl, A. Moncmanová, M. Petríková, J. Valtýni, and A. Žúžiová

Department of Inorganic Technology, Slovak Technical University, 880 37 Bratislava

Abstract:  The non-isothermal adsorption was investigated in the system benzene —molecular sieve Nalsit 13X using nitrogen as a carrier gas. The measurements were performed at different gas velocities, concentrations of adsorbate, and heights of the bed of sorbent. From a comparison of the break-through curves expressed in transformed coordinates it became evident that a constantpattern sorption front was established in the system which was also confirmed by the rinding that the temperature wave preceded the concentration wave. The quantitative relationships were investigated on the basis of the correlation between the temperature change and the value dQ/dt which was proportional to the mass-transfer rate. In the subsequent quantitative evaluation the dependence of differential heat of adsorption upon the amount adsorbed was considered and these correlations were plotted in a graph representing the change in temperature as a function of the product ΔH_diff dQ/dt. From these plots it is obvious that the character of graphs is different for the ascending and descending part of the temperature curve.

Full paper in Portable Document Format: 295a645.pdf

Chemical Papers 29 (5) 645–652 (1975)