Selection of optimal conditions for the synthesis of products for chemical regeneration of air in human life support systems

To absorb carbon dioxide and other gaseous products of human vital activity and generate oxygen necessary for respiration in the life support systems of manned orbital complexes and civil aviation aircraft, regenerative products (RP) based on peroxide compounds of alkaline metals, preferably potassium peroxide (KO2), are used. A technology for the production of RP is proposed, which consists in the preparation of an alkaline solution of hydrogen peroxide (a triple system of KOH-H2O2-H2O), its application to a matrix of ceramic highly porous cellular materials (HPCM) and subsequent dehydration. In order to prevent the decomposition of peroxide products of the triple KOH-H2O2-H2O system, a search was carried out for substances capable of acting as inhibitors of this process, i.e., to have a stabilizing effect. Magnesium sulfate, potassium silicate and sodium pyrophosphate are proposed as stabilizers for the decomposition of peroxide products. It has been experimentally shown that the best stabilizer of the triple KOH - H2O2 - H2O system in contact with the matrix from the HPCM is magnesium sulfate, the optimal molar ratio in the synthesis of the regenerative product is determined in the amount of H2O2/MgSO4 > 700/1. It is determined that the maximum content of the target component in the synthesis product is achieved with a molar ratio of H2O2/KOH equal to ~ 1.75. The influence of temperature on the kinetics of the decomposition process of peroxide products of the triple KOH-H2O2-H2O system in the presence of a matrix of HPCM was evaluated. It is shown that during the implementation of the production cycle, it is advisable to maintain the temperature of the KOH-H2O2-H2O triple system no higher than 250C. A technological process has been developed for the synthesis of a regenerative product from hydrogen peroxide and potassium hydroxide on a matrix from HPCM. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.

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