The optimal control of a periodic adsorber: Part I. Experiment

Abstract

Furthermore, if the cycle time is too short, the bed sees a mean inlet feed pressure, and no separation occurs. Likewise, an infinitely slow cycle time means steady operation, and again, no separation. Thus an optimum cycle time exist;. The objectives of the optimization can be either product purity or capacity, or a combination of both.The scope of Part I of this paper is the determination of the experimental optimum pressure wave form and cycle time for the methane-nitrogen-molecular sieve system. The theory of Part I1 indicates that the family of square waves encompasses the optima for a system in dynamic equilibrium. Therefore, the variables of cycle time, yo of time at maximum feed pressure, no feed flow, and minimum (exhaust) feed pressure were experimentally explored. Other quantities, such as bed length and diameter, feed composition, temperature and molecular sieve parameters, were not varied.The model of this system was previously developed for the in:tantaneous equilibrium assumption and is employed here. The theoretical optimization procedures were both an analysis of the model partial differential equations and an extension of the procedure of Horn and Lin, based on the Pontryagin Maximum Principle.Hence, the scope of this work includes the experimental

Piston-driven ultra rapid pressure swing adsorption

“…The assumptions employed in the modeling of URPSA were as follows (Kowler and Kadlec, 1972;Jones and Keller II, 1980;Guan and Ye, 1992).…”

Separation of proteins via semicontinuous pH parametric pumping

“…23, No. 5) Meyers (1968Meyers ( , 1970, , Pigford et al (1969), Rollce and Wilhelm (1969), Ark (1969), Horn and Lin (1969), Gregory and Sweed (1970, Turnock and Kadlec (1971), Butts et al (1972Butts et al ( , 1973, Kowler and Kadlec (1972), Shendalman and Mitchell (1972), Weaver and Hamrin (1974), Sweed and Rigaudeau (1975), Camero and Sweed (1976), Grevillot and Tondeur (1976), and Chen et al (1971and Chen et al ( , 1972and Chen et al ( , 1973and Chen et al ( , 1974aand Chen et al ( , 1974band Chen et al ( , 1974cand Chen et al ( , 1975and Chen et al ( , 1976aand Chen et al ( , 1976b. By contrast, very little work has been done on pH parametric pumping.…”

Robust Control of a Pressure Swing Adsorption Process

“…The mathematical model of the P.S.A process is made of a set of partial differential equations (PDEs) associated with the packed reactor with periodic boundary conditions that link each step. P.S.A process control has been studied in Kowler and Kadlec (1972); Matz and Knaebel (1987) and more recently in Grossmann et al (2010); Bitzer (2004Bitzer ( , 2005. In the latter, the authors proposed a model-based tracking control scheme.…”