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Two simulations are being performed with the purpose of comparing the temperature profile through the entire column and the loading profile of methane, both at the end of the feed step. The following simulations are going to be carried until 𝑡 = 40 s which corresponds to the end of the feed step. Figure 4.15 – On the left: temperature profile of the column and on the right the loading profile of methane both at the end of the feed step Despite the fact that a match was obtained for the comparison between the results gotten with gPROMS® and the data provided for the temperature profile, the same can’t be said when referring to the loading profile. As we can observe from Figure 4.15, a considerably deviation exists, mainly at the feed end of the column. In order to have some insight on what was happening inside the adsorption bed, the loading profile throughout the column for different times was analysed and can be seen in Appendix 5 (section 4.2). The analysis of the loading profile for 𝑡 = 40 s (Appendix 4, Figure 5.10) shows that the loading fronts have reached already the first 10 % of the adsorption bed. The experimental results (Figure 4.15) showed that at the feed end of the column the amount adsorbed of methane is lower when compared with the amount adsorbed a little further ahead in the adsorption bed. Further ahead in the adsorption bed the amount adsorbed of methane is higher, due to the absence of competition with the carbon dioxide. With the aim of verifying if the competition between carbon dioxide and methane took place latter, the loading profile for 𝑡 = 100 𝑠was investigated (see Appendix 4, Figure 5.11). The competition between carbon dioxide and methane is still not visible, however it is possible to see that competition between carbon dioxide and carbon monoxide takes place. The loading of the carbon monoxide is higher in the fraction of the adsorption bed where there is no carbon dioxide. This situation gets more prominent when the loading fronts arrive to the Pressure Swing Adsorption for Hydrogen Purification 345 340 335 330 325 320 315 310 305 300 gPROMS Experimental data 0 0,2 0,4 0,6 0,8 1 z 0,2 0,16 Experimental 0,12 0,08 0,04 data Obtained with gPROMS 0 0 0,2 0,4 0,6 0,8 1 z Modelling and Simulation 36 Temperature (K) qi, CH4(mol/kg)PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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