One of the critical challenges in flow-through gas purification is the continuous monitoring of outlet gas purity. This paper develops a mathematical model for the process of impurity gas capturing by powder reactants in flow-through tubes used for finishing gas purification.

The model reveals a fundamental result: there exists a single-valued functional connection between the duration of the purification process and the purity of the gas exiting the tube. This strict correlation provides the mathematical justification for a simple, cost-effective method of determining impurity concentration in the outlet gas — replacing expensive precision analytical equipment with a calibrated gas flow meter.

The sorption model covers reactants (alkali and alkali-earth metals) that provide their entire volume for capturing gas impurities by forming non-volatile chemical compounds, unlike traditional adsorbents limited to surface interactions. At the theoretical limit, the sorption capacity reaches a 1:1 atom ratio between the reactant metal and the captured gas — a unique efficiency for gas purification applications.

The paper demonstrates that the first portions of purified gas can achieve purity levels of approximately 99.9999995%, making this approach suitable for semiconductor manufacturing, CVD processes, and other applications requiring ultra-high purity gases.

Citation

Chuntonov, K., Ivanov, A.O., Verbitsky, B. & Kozhevnikov, V.L. (2017). Gas Purification and Quality Control of the End Gas Product. Journal of Materials Science and Chemical Engineering, 5(8), 44-58.

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