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Configuration Investigation for Lithium Oxide Carbon Dioxide Control Systems

Report Number: AMRL TR 67-62
Author: Boryta, Daniel A.
Author: Dezmelyk, Eugene W.
Corporate Author: Foote Mineral Company Research and Engineering Center
Laboratory: Aerospace Medical Research Laboratories
Date of Publication: 1967-10
Pages: 159
Contract: AF 33(615)-3382
Project: 6373
Task: 637302
AD Number: AD0663762

The bulk density of lithium oxide shapes and granules has been increased substantially while retaining good reactivity. Absorbent forms of the oxide can be prepared in the bulk density range of 0.18 to 0.28 g/cc. For granular oxide, results indicate a reasonable compromise between reactivity and absorbent volume efficiency is about 0.20 g/cc in passive systems and 0.26 to 0. 28 g/cc in semipassive or dynamic systems. The improvement results from use of high (about 18 m sq/g) surface area lithium peroxide raw material and techniques in processing the peroxide to oxide. Tests indicate the oxide forms developed can equal (passive exposure) or exceed (semipassive or dynamic exposure) the 0.8 g CO2/g LiOH capacity of granular lithium hydroxide before 2% breakthrough. Dusting of the granular oxide form was reduced by controlled abrasion and fabric encasement techniques. Tests at one-third and normal atmospheres indicated higher carbon dioxide absorption rates at the lower pressure. A marked improvement was found in oxygen-helium as compared to oxygen and oxygen-nitrogen atmospheres. Atmospheric moisture conditions required for efficient absorption were defined. Exploratory work indicates partial hydration of the oxide is one method for initiating absorption under low humidity conditions. Gravimetric analysis work, which confirmed that density limitations are presently imposed by reaction product-substrate molar volume relations, should provide useful guidelines for absorbent design and further experimentation.

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