Periodic states of adsorption cycles: Direct calculation and interesting properties

IEC 99

M. Douglas LeVan1, Yuqing Ding1, and Kamini I. Dunne2. (1) Department of Chemical Engineering, Vanderbilt University, VU Station B 351604, Nashville, TN 37235, (2) Department of Chemical Engineering, University of Virginia, Charlottesville, VA 22903
The traditional method for determining a periodic state (cyclic steady state) of an adsorption cycle (e.g., PSA or TSA) from a mathematical model involves simulating a process through successive cycles until the solution is not changing very much from cycle to cycle. We have developed methods based on nonlinear analysis to determine the periodic states directly. These will be described in the paper including our new specialized software for accelerated convergence and optimization. We will also describe interesting properties of the periodic states including stability and multiplicity.