Separations via continuous parametric pumping
TL;DR: In this article, a continuous pump in which the feed and product streams flow steadily both in upflow and downflow is experimentally investigated in the model system toluene-n-heptane on silica gel adsorbent.
Abstract: A continuous pump in which the feed and product streams flow steadily both in upflow and downflow is experimentally investigated in the model system toluene-n-heptane on silica gel adsorbent. The experimental data compare reasonably well with analytical results based on an equilibrium theory. The operating conditions necessary to achieve high separation factors are shown to be dependent on the relative magnitudes of penetration distances and the height of the column.
Citations
More filters
01 Apr 1974
TL;DR: A review of cyclic separation methods used for adsorption, ion exchange, and chromatographic separation processes where the cyclic parameter is a thermodynamic variable which changes the equilibrium distribution coefficients of the solutes can be found in this article.
Abstract: This review covers cyclic separation methods used for adsorption, ion exchange, and chromatographic separation processes where the cyclic parameter is a thermodynamic variable which changes the equilibrium distribution coefficients of the solutes. The cyclic methods reviewed include heatless or pressure-swing adsorption, parametric pumping, and cycling zone adsorption. These cyclic techniques have been studied as a possible preparative chromatographic separation method or for continuous production from adsorption or ion exchange columns.
27 citations
TL;DR: In this article, the authors developed a user-friendly package called Visual Pumping (VP) for the simulation of thermal parametric pumping processes with educational and training purposes, based on Visual Basic.
17 citations
Cites background from "Separations via continuous parametr..."
...Batch, semi-continuous and continuous modes of operation have also been addressed [2, 3 ,4]....
[...]
TL;DR: In this paper, the authors described a mechanism for a single packed column with reservoirs attached to each end to retrain the column during a downflow, thus retarding the adsorption step.
Abstract: Parametric pumping is the name given to a novel separation device developed by Richard Wilhelm and co-workers(1,2,3). The principle of operation depends on an immobile phase (e.g. adsorbent) to alternately retard and release selected species. This action coupled with a synchronous periodic fluid flow causes the selectively adsorbed species to be literally pumped from one region to another. In the successful experiments(2,3) a single packed column was used with reservoirs attached to each end. A water jacket surrounding the bed was heated or cooled synchronously with periodic fluid motion. Figure 1 outlines the principle of operation. Essentially, the process operates in a “bucket-brigade” fashion. If one follows the travels of a single solute (see Figure 1) in a non-adsorbable solvent we see that during downflow the column is cooled thus retarding (adsorption step) the solute, allowing the solvent to move unimpeded. When the flow direction changes to an upward motion, the column is heated, releas...
16 citations
TL;DR: In this article, the scale-up concerns in adsorptive parametric pumping operation in recuperative mode are studied and an experimental study of the purification of wastewater containing 100 ppm of phenol using a polymeric adsorbent (Duolite ES861-Rohm and Haas, France) is reported.
Abstract: In this work scale-up concerns in adsorptive parametric pumping operation in recuperative mode are studied An experimental study of the purification of wastewater containing 100 ppm of phenol using a polymeric adsorbent (Duolite ES861-Rohm and Haas, France) is reported A completely automated pilot plant (column and ancillary equipment, product receivers, sampling, collector and analytical devices) is described The plant is computer controlled enabling automatic data acquisition for temperature, pressure and flowrate
16 citations
01 Jan 1986
TL;DR: The concept of parametric pumping is due to Wilhelm and coworkers (1966, 1968) as mentioned in this paper, whose original results deal with adsorption from the liquid phase, modulated by temperature.
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.
14 citations