Leperi K., Gao H., Snurr R., You F., 2014, Modeling and Optimization of a Two-Stage MOF-Based Pressure/Vacuum Swing Adsorption Process Coupled with Material Selection, Chemical Engineering Transactions, 39, 277-282.
In this paper, we address the optimal design of a pressure/vacuum swing adsorption (PSA/VSA) process for post-combustion CO2 capture. A mixed-integer partial differential equation constrained optimization model for a two-stage PSA/VSA cycle is developed in order to select the most effective adsorbent material to minimize the process cost of capturing the CO2 from the flue gas. Consideration is given to the effect of water on the adsorbent material and the design of the upstream dehydration units. Zeolite 13X, zeolite 5A and ZIF-78 are all evaluated for use in the process. The results show that with a two-stage system using ZIF-78 as the adsorbent, a recovery of 90 % of the CO2 and a purity of 80 % can be achieved at a cost of $56.7 per ton of CO2 captured and a 41.2 % energy penalty.
