THE EFFECT OF WATER VAPOR ON THE LiOH-CO2 REACTION. PART 1. DYNAMIC ISOTHERMAL SYSTEM
NAVAL RESEARCH LAB WASHINGTON DC
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The role of water vapor H2O in the reaction of carbon dioxide CO2 with lithium hydroxide LiOH in a dynamic system was isolated by maintaining an essentially isothermal system through the use of low concentrations of CO2. The LiOH was found to be hygroscopic, with the rate of water pickup directly related to the relative humidity of the feed system. Hydration to the monohydrate LiOH-H2O proved to be a necessary precursor to the CO2 reaction but the rate of hydration must not exceed the rate of carbonation if high efficiencies are to be realized. The controlled rate of hydration is necessary in order to maintain the high surface area and porosity of pelletized LiOH. The previously accepted equation, 2 LiOH CO2 yielding Li2CO3 H2, thus becomes the summation of the two-step reaction, 2 LiOH 2 H2O 2 LiOH.H2O and 2 LiOH.H2O CO2 yielding Li2CO3 3H2O.
- Inorganic Chemistry
- Physical Chemistry
- Life Support Systems