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zeolite layer and can be observed in the loading profile for 𝑡 = 1000 s (see Appendix 4, Figure 5.12). Given that the shape of the adsorbent particles was not provided by the literature, affecting the LDF coefficient due to Ω parameter, it was agreed to perform simulations considering different shapes for the adsorbent particles and, therefore, different LDF coefficients. Taking into consideration the information provided in other literature from the same authors and with the aim of correcting the deviation observed between the simulation and experimental results, it was agreed to perform a different simulation assuming that the particles of activated carbon were slab micropores (Ω𝑐 = 3) and the zeolite particles were cylinders (Ω𝑐 = 8) [40]. Figure 4.16 – Comparison of the loading profiles with different adsorbent geometries The loading profiles obtained for particles with a spherical shape show that changing the LDF factor, Ω, does not provide a better resemblance with the literature data. Decreasing the LDF factor decreases the LDF coefficient, causing a higher mass transfer resistance. This results in a lower loading for methane, as can be observed in Figure 4.16. Taking this into consideration, it was agreed to assume that both particles had a LDF factor equal to 8 and perform a new simulation. Results in Figure 4.16 show that the loading of methane at the feed end of the column still is higher than what is obtained in the literature [39]. Considering that the packages regarding the properties of the components provided by gPROMS® are made with the purpose of being applied in simulations of a wide range of industrial processes, like it was mentioned in chapter three of the present work, some of the deviations verified between simulation and literature data might be related with the Pressure Swing Adsorption for Hydrogen Purification 0,18 0,16 0,14 0,12 0,1 0,08 0,06 0,04 0,02 0 Ω(AC)=3,Ω(Z) = 8 Ω(AC and Z) = 15 Literature 0,4 0 0,2 z 0,18 0,16 0,14 0,12 0,1 0,08 0,06 0,04 0,02 0 Ω(AC and Z)=8 Ω(AC and Z) = 15 Literature 0,4 0 0,2 z Modelling and Simulation 37 qCH4(mol/kg) qCH4(mol/kg)PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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