Equilibrium staged parametric pumping: II. Multiple transfer steps per half‐cycle and reservoir staging

A package for thermal parametric pumping adsorptive processes

Abstract: Thermal parametric pumping is a cyclic adsorptive process based on cyclic changes in the bed temperature simultaneously with flow reversal. Simplified models are adequate to describe these cyclic processes with long cycle times. Two simplified models are used here: Model I is an equilibrium model plus axial dispersion and Model II accounts for intraparticle mass transfer with LDF approximation. Simulations used parameter values obtained for the system phenol/water/ adsorbent resin Duolite ES861. Model validation is carried out by performing experiments in a pilot plant with the system phenylalanine/water/polymeric adsorbent SP206 and using published experimental data for the system phenol/water/adsorbent resin Duolite ES861. A user-friendly package ‘Visual Pumping’ (VP) is developed in Visual Basic for the simulation of thermal parametric pumping processes with educational and training purposes.

Parametric Ion-Exchange Processes (Parametric Pumping and Allied Techniques)

Abstract: The term “parametric pumping” implies the idea of pumping, that is of transport of material (in our case, ionic species) up along some potential scale (in our case, chemical potential), at the cost of degradation of some flux of energy (to be specified later). The term “parametric” refers to the fact that the energy flux just mentionned is obtained by modulating some intensive thermodynamic parameter such as temperature, pressure, ionic strength, pH, electric potential, … Typical examples are temperature-swing ion-exchange and pressure-swing adsorption. The concept of parametric pumping is due to Wilhelm and coworkers (1966, 1968). Their original results deal with adsorption from the liquid phase, modulated by temperature. Let us examine how these phenomena are implemented.

Adsorptive separation by thermal parametric pumping part I: Modeling and simulation

Abstract: A detailed model for the recuperative parametric pumping is presented. The model includes intraparticle mass transfer resistance, axial diffusion and non-linear equilibrium represented by Langmuir equation. The sensitivity studies shows that process performance strongly increases when cycle time increases and φB/φT ratio and particle size decreases. It also shows that bottom and top dead volumes do not influence much the process performance. Evolution of the histories of concentrations and temperatures, the bed performance from cycle to cycle and the bed dynamics at the cyclic steady state have been discussed.

Preparative scale separation of amino acids by using thermal ion exchange parametric pumping

Abstract: Separation of amino acids by thermal parametric pumping is experimentally and theoretically investigated. A multicomponent, non-linear model that takes into account the dissociation reaction in liquid phase is used to predict the separation and to investigate the effect of the resin type on the performance of parametric pumping. Experiments have been done with different mixtures of glutamic acid, leucine, phenylalanine, proline, serine and valine. The experimental results demonstrate the capability of thermal parametric pumping of separating amino acids from aqueous mixtures. The simulations give the correct general behaviour of the experimental results and help to select the resin that is more suitable for the separation.