Date of Award
Doctor of Engineering Science in Chemical Engineering
Chemical Engineering and Chemistry
Hung T. Chen
Hans E. Pawel
Angelo J. Perna
Howard S. Kimmel
A continuous parametric pump in which the feed and product streams flow steadily both in upflow and downflow (hot and cold temperatures, respectively) is examined theoretically and experimentally. The model system is Sodium Chloride-Water-Bio Rad AG11A8 Ion Retardation Resin, a physical system characterized by relatively slow interphase mass transfer rates. For short half-cycle times, where interphase equilibrium is not approached, separation of the salt from water is found to be enhanced by longer half-cycle times, smaller reservoir displacements, and longer adsorbant columns. In most cases, separation improves with increasing number of cycles. However, steadily degrading separation is found to exist when solute loading on the cold half-cycle exceeds the regenerating capacity of the hot half-cycle upflowing fluid, a situation produced by increased lean (bottom) product withdrawal rate.
A computational method for predicting continuous non-equilibrium parametric pump performance is developed. The method is based on a set of exterior solute material balances, the equations of change for the two-phase system and a linear adsorption isotherm for the solute-solvent-adsorbant system. The method of characteristics is combined with a finite difference approximation to solve the equations of change. There is good agreement between predicted and experimental results.
Rak, John Lawrence, "The continuous non-equilibrium parametric pump: a theoretical and experimental study" (1978). Dissertations. 1243.