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Chapter 3. Mathematical Modeling of PSA Systems Table 3.1: A brief overview of important literature studies on PSA dynamic modeling (Z = Zeolite, AC = Activated carbon) Authors [175] [45] [136] [83, 84] [167] [171] [58] [129] Feed Mix- ture H2 -CH4 , H2 bulk separation Air, O2 production H2 -CH4 , H2 purifi- cation H2 from coke gas H2 purifi- cation from coke oven gas Propane- propylene separation H2 purifi- cation from H2, CH4, CO, CO2 , N2 PSA Cycle 1bed,5 steps Skarstrom cycle 4 beds, 9 steps PSA in Isotherm AC, Langmuir- Freundlich Z, Lang- muir Langmuir loading ra- tio correla- tion Layered adsorbent - Z and AC, Langmuir- Freundlich Z, Mul- tisite Langmuir Layered adsorbent - Z and AC, Multisite Langmuir Mass Transfer Pore diffu- sion LDF (Lin- ear driving force model) Various limiting cases of ex- ternal and internal resistances LDF LDF LDF Both inter- nal and ex- ternal resis- tances con- sidered Both inter- nal and ex- ternal resis- tances con- sidered Heat effects Non isother- mal Isothermal Non isother- mal Non isother- mal Non isother- mal Non isother- mal Non isothermal, separate equations for fluid, solid and column wall Non isothermal, separate equations for fluid, solid and column wall Pressure Effects Dispersion Valve Mod- series, steps 2 bed, steps 1 bed, steps 1 and beds, steps 8 7 5 4 5 No gradi- ents dis- Ergun’s equation dis- Ergun’s equation dis- Ergun’s equation dis- Ideal Yes flow Axially No persed plug flow Axially No persed plug flow Axially No persed flow Axially No persed flow el- ing No gradi- ents plug No gradi- ents, stays dis- constant persed during flow adsorption and purge Blake- Kozeny plug equation flow Ergun’s equation plug Ideal No flow Axially No Ideal No 46PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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