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Figure 4.11 – gPROMS® results: on the left breakthrough for a 0.32cr and on the right breakthrough for 0.65 cr Relatively to the nitrogen and carbon monoxide, the time required for these two components to breakthrough of the adsorption bed is considerably higher when the length of the zeolite layer is increased. However, the impact is not as visible as it is for the components adsorbing in the activated carbon layer. This can be explained due to the molar fraction of the components being removed in the zeolite layer being smaller than the molar fraction of the components adsorbing in the activated carbon. A comparison between the experimental and simulation breakthrough curves for the five component mixture is made and presented in the Appendix 3 (see section 3.3). In this comparison is shown that gPROMS® model can be used for the prediction of the breakthrough time in the conditions of the considered simulations. 4.2.3 Validation of the Langmuir-Freundlich multilayer isotherm with different data The Langmuir-Freundlich isotherm modelled previously is now going to be employed in a process that originally used a different isotherm model. The present literature was considered taking into consideration that the feed and operating conditions were similar with the ones employed in the validation section of the Langmuir-Freundlich isotherm. A column with the same dimensions is used in the process; however, the molar fractions of the components present in the feed mixture are different from the simulations performed above. The feed flow rate and pressures are contained in the range of pressures where the gPROMS® simulations results provided good predictions of the breakthrough time. The following simulations are performed with the purpose of having an insight on the capabilities of the new model in predicting the breakthrough for different situations besides the ones employed for its validation. Four different simulations are being executed for the analysis of the breakthrough of a five component mixture, first with one layer of activated carbon, then with a column filled with zeolite and the last simulation considers a column with two layers of adsorbent, activated carbon layer followed by a zeolite layer. Pressure Swing Adsorption for Hydrogen Purification 1 0,8 0,6 0,4 0,2 0 H2 CH4 CO2 CO N2 10 100 1000 time (s) 1 0,8 0,6 0,4 0,2 0 H2 CH4 CO2 CO N2 10 100 1000 time (s) Modelling and Simulation 31 molar fraction molar fractionPDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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