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Figure 4.13 - Breakthrough of a 5 component mixture with a 0.7 layer of activated carbon and 0.3 layer of zeolite: on the left, feed pressure of 6.5 bar and on the right feed a feed pressure of 8 bar When increasing the feed pressure a higher capacity of the adsorption bed is observed when compared with lower feed pressures, resulting in a latter breakthrough of the components of the feed mixture. The comparison between the feed pressures of 6.5 and 8.0 bar show a difference of 200 seconds in the breakthrough of nitrogen, for example. A deviation to the right in the breakthrough profiles can be observed and also the fact that a large width in the curves is verified for higher pressures. The analysis of the breakthrough for a feed pressure of 6.5 bar in Figure 4.13 provides a contrast with Figure 4.12, showing the impact of the addition of a layer of zeolite in the adsorption bed. By including this layer in the adsorption bed a latter breakthrough of nitrogen and carbon monoxide can be observed when comparing with a bed employing only one layer of activated carbon. This situation takes place due to the visible increase in the bed capacity of adsorbing nitrogen and carbon monoxide. The comparison of the experimental and simulation breakthrough curves for a feed pressure of 6.5 bar shows that the prediction obtained with gPROMS® model is good but, the breakthrough of carbon dioxide takes place considerably earlier when compared with the experimental results (see Appendix 3, section 3.4). The prediction of the breakthrough for methane can be considered good; however, due to the small molar fraction of this component in the feed mixture the breakthrough profile concerning this component is not visible in the mentioned graphical representation. 4.3 Multisite Langmuir isotherm A Multisite Langmuir isotherm for multilayer processes was intended to be introduced to gPROMS® libraries. A Multisite Langmuir isotherm, employed in a PSA process for the Pressure Swing Adsorption for Hydrogen Purification 1 0,8 0,6 0,4 0,2 0 H2 CH4 CO2 CO N2 0 1000 2000 time (s) 1 0,8 0,6 0,4 0,2 0 H2 CH4 CO2 CO N2 1500 2000 0 500 1000 time (s) Modelling and Simulation 33 molar fraction molar fractionPDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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