Abstract
A mathematical model of the sorption process in a tribochemical reactor with a stirrer, where monolithic granules of alkali-earth metals mutually rub in the media of the flow gas, has been built. The products of reaction of the metal with the gas impurity are continuously removed mechanically from the surface of the granules, creating new metallic regions. As a result the total area of the sorbing surface appears to be by orders of magnitude larger than that of the traditional getter materials of the same mass in the existing sorption technologies. It follows from the model that the gas purification process obeys the linear law at a constant rotation speed of the stirrer. This dependence results in a great simplification of the process control. It also makes possible replacement of a periodic mode of operation by a continuous one where the sorption capacity of the consumed chemisorbent attains theoretical limit.
Highlights
Powders, films or gas-permeable porous bodies of alkali-earth metal alloys are effective chemisorbents [1]-[6]
We find for any moment of time t such values as the amount of the consumed reactant, equal to ρMe (1− ε ) πR2 zt, its current sorption capacity q mMe =t, the amount of treated gas vπR2t, and the current rate of capturing gases zM Y M Me L0, which is a constant if the speed ω is constant
1) The mathematical model of the sorption process in the flow tribochemical reactor with a stirrer has been built for the systems gas/solid, where the solid is monolithic granules of reactant Me consisting of alkali-earth metals or their alloys
Summary
Films or gas-permeable porous bodies of alkali-earth metal alloys are effective chemisorbents [1]-[6]. The surface of the metal is available for these reactions with gases but its volume as well providing a great advantage of the alkali-earth metal alloys over adsorbents with respect to the specific sorption capacity [7] [8] [9]. To underline this peculiarity of the sorption behavior of the reactive alloys it was suggested to call them “reactants” and to single them out into a separate class of getter mate-. The analysis of all factors influencing the sorption process is needed in order to find optimal regimes for gas purification
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