Thermal Method for Testing Small Chemisorbents Samples on the Base of Potassium Superoxide

Authors: Pavel V. Balabanov, Daria A. Liubimova, Aleksandr P. Savenkov

Abstract:

The increase of technogenic and natural accidents, accompanied by air pollution, for example, by combustion products, leads to the necessity of respiratory protection. This work is devoted to the development of a calorimetric method and a device which allows investigating quickly the kinetics of carbon dioxide sorption by chemisorbents on the base of potassium superoxide in order to assess the protective properties of respiratory protective closed circuit apparatus. The features of the traditional approach for determining the sorption properties in a thin layer of chemisorbent are described, as well as methods and devices, which can be used for the sorption kinetics study. The authors developed an approach (as opposed to the traditional approach) based on the power measurement of internal heat sources in the chemisorbent layer. The emergence of the heat sources is a result of exothermic reaction of carbon dioxide sorption. This approach eliminates the necessity of chemical analysis of samples and can significantly reduce the time and material expenses during chemisorbents testing. Error of determining the volume fraction of adsorbed carbon dioxide by the developed method does not exceed 12%. Taking into account the efficiency of the method, we consider that it is a good alternative to traditional methods of chemical analysis under the assessment of the protection sorbents quality.

Keywords: Carbon dioxide chemisorption, exothermic reaction, internal heat sources, respiratory protective apparatus.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1110105

References:

[1] P. C. Wood, T. Wydeven “Improved Oxygen Sources for Breathing Apparatus: report NASA”, NASA Ames research. Moffett field. Calif., 61 p., 1985.
[2] P. C. Wood, T. Wydeven, “The use of superoxide mixtures as airrevitalization chemicals in hyperbaric, self contained, closed circuit breathing apparatus”, NASA Ames research. Moffett field. Calif., 61 p., 1985.
[3] Lee D. Hansen “Calorimetric Measurement of the Kinetics of Slow Reactions”. Ind. Eng. Chem. Res, no. 39, pp. 3541-3549, 2000.
[4] V. Hemminger, G. Khene “Calorimetry. Theory and practice”. Moscow, Chemistry, 176 p., 1990.
[5] R. E. Tapscott, L. D. Hansen, E. A. Lewis “Calorimetric Studies of Stereoselective Vanadyl (IV) Tartrate Reactions”. J. Inorg. Nucl. Chem., №. 37, pp. 2517-2519, 1975.
[6] O. Sohnel, M. Kroupa, G. Frankova´, V. Velich “Calcium Oxalate Crystallization Kinetics from Calorimetric Measurements”. Thermochimica Acta, vol.306, Issues 1–2, 17, pp. 7-12, November 1997.
[7] V. P. Lehto, E. A. Laine “Kinetic Study of Polymorphic Transition of Anhydrous Caffeine with Microcalorimeter”. Thermochimica Acta, vol. 317, Issue 1, 6, pp. 47-58, July 1998.
[8] P. V. Balabanov, S. V. Ponomarev “The use of the theory of the twoalpha method to investigate the thermophysical characteristics of regenerative products and chemical absorbents”. Measurement Techniques, vol. 53, no. 11, pp. 1256-1263, February 2011.
[9] P. V. Balabanov “A thermal method of measuring the chemisorption characteristics of regenerative products”. Measurement Techniques, vol. 55, no. 5, pp. 589-594, August 2012.
[10] A. A. Krimshteyn, S. V. Plotnikov, V. I. Konovalov, B. V. Putin “Simulation of isolating devices chemical oxygen” Journal of Applied Chemistry, vol. 65, no. 11, pp. 2463-2469, November 1992.