Systems for efficient use of fixed beds in large scale operations of sorptive separation processes have been studied. A laboratory scale pilot plant was built to test different flow and column arrangements experimentally. As a test system the plant utilizes an amphoteric, thermally regenerated, ion-exchange resin (Amberlite XD-5) for the removal of sodium chloride from water. Several columns are used simultaneously in a special 'merry-go-round' cycle, during which a temperature swing causes sorption and desorption to occur alternatively. The efficiency of the process is maximized by the proper periodic countercurrent action and by the optimal selection of flow rates and cycle time. Numerical simulation of the process has been undertaken also, allowing quantitativ prediction of the performance of the system for various operating conditions. The mathematical analysis reveals an interesting analogy to equivalent steady-state continuous processes, which can be used for simplified design procedures applicable to periodic cyclic operation. Our studies show that the efficiency of a four-column periodic countercurrent process can be, for our test system, as high as 80 % of the theoretically possible one for a truly continuous countercurrent process with the same resin inventory. Many of the practical problems associated with the operation of the latter are, however, entirely avoided.
Periodic countercurrent operation of sorption processes applied to water desalination with thermally regenerable ion-exchange resins
Periodischer Gegenstrombetrieb von Sorptionsverfahren in derAnwendung fuer die Wasserentsalzung mit thermischer Regenerierung von Ionaustausch-Kunstharzen
1984
278 Seiten
Theses
English
WASSERAUFBEREITUNG , WASSEREXTRAKTION , DESTILLATION , ENTSALZUNG , ENTSALZUNGSANLAGE , ENTSALZUNGSGRAD , FESTBETTADSORBER , CHEMISCHES TRENNVERFAHREN , TRENNEN (ABSCHEIDEN) , IONENAUSTAUSCH , KUNSTHARZ , NATRIUMCHLORID , TRENNKOLONNE , KONSTRUKTIONSDATEN , SORPTION , SORPTIONSMITTEL , BETRIEBSPARAMETER , MATHEMATISCHES MODELL , NAEHERUNGSVERFAHREN
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