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The preparation of calcium superoxide at subambient temperatures and pressures.

Authors
Ballou-EV; Wood-PC; Spitze-LA; Wydeven-T; Stein-R
Source
J Eng Ind 1978 Feb; 100(1):26-30
NIOSHTIC No.
10000971
Abstract
We have previously reported on the preparation of calcium superoxide, Ca(O2 )2 , from calcium peroxide diperoxyhydrate, CaO2 2H2 O2 . In that work, the preparation of a product of higher purity than that reported elsewhere was ascribed to the carefully controlled reaction conditions. The effect of temperatures between 25 and 60C (298333 K), reaction time, and reactant packing were studied. In further experiments reported here, disproportionations at lower temperatures and a range of reaction chamber pressures were studied. Disproportionations at 0C (273 K) and surface spreadings of 312 to 36 cm2 /g resulted in 5961 percent purity Ca(O2 )2 , showing that higher surface loadings could be used in the reaction dish at subambient temperature than at ambient temperature. This is a significant feature for prospective scale up of the mass prepared in a single experiment. Reactions were studied at chamber pressures between 6 m and 300 mm Hg (0.8 Pa40 kPa) at 30C (303 K). The optimum pressure for product purity was 90 m Hg (12 Pa), possibly because the reactant overheated at lower pressures. Product purity at higher pressures improved when molecular sieve desiccant was mixed with the reactant.
CODEN
JEFIA8
Publication Date
19780201
Document Type
OP; Journal Article
Fiscal Year
1978
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
0022-0817
NIOSH Division
PRC
Source Name
Journal of Engineering for Industry
State
PA
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