โ Scribed by Richard G. Rice; Eugene L. Benoit
No coin nor oath required. For personal study only.
We introduce a novel physical method to ascertain gas-liquid kinetic parameters without resort to wet chemistry. The conditions whereby the controversial technique called the "chemical method" can he reliably used to measure the interfacial area in gas-liquid dispersions has been recently clarified by Schumpe and Deckwer (1980, Chem. Engng Sci. 35,2221-22332 Much of the disagreement arises because researchers use literature bench-scale kinetic data to estimate the interfacial area in a larger pilot-scale unit, with differing water quality and chemical purities. It is now widely recognized that in-house data, which matches the specific pilot plant condition, is the prudent course of action. Thus, a simple bench-scale unit is necessary, the description of which is the purpose of the present work. The batch method used is fast, cheap and simple, and produces reliable results, even for non-linear chemical systems. The only measured quantity is the gas-phase pressure above a reacting liquid interface. The key physical-chemical design constraint requires that the system time constant is at least an order of magnitude larger than the total experimental contact time. Under such conditions, the analysis shows that a single parameter contains all the necessary order and rate constant information. The first pressure-transient prototype is tested using the classical sulphite oxidation reaction in the presence of cobaltous catalyst. Very good agreement with literature values is obtained.
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