Kostova M.A.Ivanova E.P.Stefanov G.C.2024-07-162024-07-162024-07-162024-07-162015-01-011314-79781314-7471SCOPUS_ID:84929090048https://rlib.uctm.edu/handle/123456789/1096Natural clinoptilolite is a suitable adsorbent for polar molecules such as water, alcohols and many other adsorptive components and it is also very selective in removing sulfur dioxide at low concentrations from gaseous mixtures such as the undesired industrial waste gases. This paper investigates the fixed bed adsorption of sulfur dioxide by natural clinoptilolite in laboratory scale in order to determine the Intra Particle Mass Transfer Resistance of the process. Several experimental adsorption runs at different fixed bed lengths and gas flow velocities were made to achieve the Constant Pattern (CP) behavior and the CP-Breakthrough Curves (BTC) were further examined though their Breakthrough Points and statistical characteristics (1st absolute and 2nd central statistical moments) by means of the Intra Particle Linear Driving Force Model (LDFQ) and the simple linear Shilov's relation in order to estimate the Intra Particle Mass Transfer Resistance. The results were quantitatively discussed in comparison to the Macro Pore Mass Transfer Resistance, using the binary molecular and Knudsen diffusivities and in accordance with the bi-porous structure of the zeolite as well. A comparison was also made to the Intra Particle Mass Transfer Resistance from the Intra Particle Diffusion Model (DMQ) at Langmuir and at linear equilibrium.enArticle