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incorporated. A relation between the axial dimension and the fraction of this dimension corresponding to a certain layer of the bed is obtained with the introduction of this variable and it can be seen below (Table 4.2). Table 4.2 – Scheme of the relations between variables in the multilayer model Relation between variables for a multilayer column Pressure Swing Adsorption for Hydrogen Purification For z = 0 to domain boundary per layer cum(1) qeq = isothermport. qeq heat of adsorption(1, ) = isotherm. heat of adsorption(1, ) For n = 1 to number of layers For z = domain boundary per layer cum (n) to domain boundary per layer (n+1) qeq = isothermport. qeq heat of adsorption(n, ) = isotherm. heat of adsorption(n, ) The previously mentioned changes were applied to the sections of the Langmuir and Langmuir-Freundlich isotherms present in the multilayer model considering that these two models were also being improved with the purpose of being used in multilayer PSA processes. 4.2 Langmuir-Freundlich multilayer isotherm Taking into account the literature [31], a Langmuir-Freundlich isotherm was chosen to be included in gPROMS® libraries. Considering that all the data required for the simulation could be accessed, a comparison between the results from the simulation with the model and the experimental data could be done. The selected literature for the validation of the Langmuir-Freundlich multilayer isotherm refers to a process where the adsorption column contains two layers, being the adsorbents employed, from the feed to the product end, activated carbon and zeolite. The effect of the feed flow rate and feed pressure were studied for mixtures of two, three and five components as well as the temperature profiles for each situation. In the mentioned work, the effect of the ratio of adsorbents used is also studied with breakthrough experiments performed for three different arrangements of the adsorbent layers. The mathematical model suggested in the considered literature assumes that the gas phase behaves as an ideal gas mixture, radial concentration and temperature gradients are Modelling and Simulation 21PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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