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Despite this difference between experimental and simulation data, for the following simulations of the present work, it will be considered that 𝑘3,CO2 = 1.578 ( 1 ) for the zeolite atm layer. Figure 4.9 – Comparison of the results between the simulation with gPROMS and experimental data for the breakthrough of the H2/CO2 mixture at 10 atm and 6.8 SLPM The simulations with the binary mixtures showed that good predictions are obtained with the gPROMS® breakthrough model for the feed pressures of 4 and 10 atm. However, when the pressure is increased to 16atm a considerable deviation between the simulation and experimental results takes place. This deviation is also prominent for the binary mixture of hydrogen and carbon dioxide. In respect to the shape of the breakthrough curve it can be observed that for the experimental results a slightly steepest curve is observed when compared with the results obtained with gPROMS®, although the approximation of the molar fraction to the feed molar fraction takes much longer than in the simulation results. 4.2.2.2 Five component breakthrough simulation A five components mixture was used as feed in order to investigate the influence of the activated carbon ratio of the adsorption bed in the breakthrough curve for each component. In the following simulations three different carbon ratios are employed in a process with a feed flow rate of 8.6 SLPM and a feed pressure of 10 atm. The same assumptions considered for the binary mixtures are made for the five component simulations, as well as the temperatures. In the first simulation the column is considered to have the same length of each adsorbent. The molar fractions of each component in the feed mixture are provided in the literature and can be seen in Appendix 3 (see section 3.3) Pressure Swing Adsorption for Hydrogen Purification 1 0,95 0,9 0,85 0,8 0,75 0,7 Experimental data Simulation 2000 3000 0 1000 time (s) Modelling and Simulation 29 molar fraction (H2)PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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