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Ambient temperature (Tw) Isotherm parameters 5.1 Introduction and Previous Work Table 5.1: Activated carbon properties and model parameters [100] Parameter Bed porosity (εb) Particle diameter (dp) Adsorbent density (ρs) Bulk density (ρb) Heat capacity of solid (Cps) Heat transfer coefficient (UA) Gas viscosity (μ) Gas constant (R) Mass transfer coefficient (k) Heat of adsorption (∆Hads) Value 0.37 0.00149 m 544.64 kg m−3 343.12 kg m−3 711.75 J kg−1 K−1 0.2839 J m−3 sec−1 K−1 1.2021×10−5 kg m−1 sec−1 8.314 J mol−1 K−1 CO2=0.45 sec−1 H2=1.45 sec−1 CO2=24801 J mole−1 H2=8420 J mole−1 298 K CO2 H2 k1 1.16 1.16 k21 0 0 k31 6.96×10−10 1.06×10−9 k41 3259.683 1012.75 k12 8.33 8.33 k2 0 0 k32 1.88×10−10 1.06×10−9 k42 2706.279 1012.75 CO2 from a flue gas or reformer off-gas mixture, consequently making it a heavy-product. The conventional PSA cycles are inappropriate for concentrating heavy-product because the light-product purge step (or the light reflux step) in these cycles uses a portion of the light- product for purge. This necessarily dilutes the heavy component in the heavy-product stream. Therefore, a pure light component is easy to attain from such cycles, but not a pure heavy component. Thus, it is necessary to develop PSA processes specifically targeted to obtain pure strongly adsorbed CO2. Very few examples of CO2 purification from a reformer off-gas mixture using a PSA process can be seen in the literature. Sircar et al. developed a 5-bed 5-step PSA process to extract methane and carbon dioxide both at a high purity from a feed mixture having 40-60% CO2 and CH4 [174, 165]. A pure CO2 rinse step was used in the process to Chapter 5. Superstructure Case Study: Pre-combustion CO2 Capture 75PDF Image | Design and Operation of Pressure Swing Adsorption Processes
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