(300g) Novel Steady State Process Modeling Methodology for Pressure Swing Adsorption
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Fuels and Petrochemicals Division
Refining and Petrochemical Plant Modelling and Operations Improvements I
Tuesday, October 30, 2018 - 10:05am to 10:30am
Although rigorous dynamic simulation models are available for use in design and operations of pressure swing adsorption (PSA) units, such models involve sophisticated numerical solution of a complex system of partial differential equations. To explore the potential use of PSA as an intensified process alternative to conventional thermal separation processes, chemical engineers need a robust and practical PSA simulation model that properly captures the essential process fundamentals of PSA in steady state process simulation environments. We present a novel PSA steady state process modeling methodology that takes into consideration PSA unit capacity, cyclic steady state operations, mass and energy balances, and adsorption isotherms. In a way similar to âtray efficiencyâ in multistage thermal separation processes such as distillation, an âadsorption efficiencyâ is introduced to model rate-based adsorption processes. The relationship between âadsorption efficiencyâ and effective mass transfer coefficients are further examined with a rigorous dynamic PSA model. The modeling methodology is illustrated with two PSA examples: 1) nitrogen rejection from methane, and 2) carbon dioxide capture from natural gas. This novel PSA process modeling methodology should reprsent a new process modeling paradigm for chemical engineers to effectively examine the process intensification potential of PSA for their separation needs.