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Adsorptive separation of Kr from N 2 — Part I Adsorbent screening studies
Author(s) -
Ruthven D. M.,
Tezel F. H.,
Devgun J. S.,
Sridhar T. S.
Publication year - 1984
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450620412
Subject(s) - adsorption , molecular sieve , mordenite , chemistry , selectivity , zeolite , diffusion , krypton , chromatography , impurity , analytical chemistry (journal) , radiochemistry , nuclear chemistry , organic chemistry , xenon , thermodynamics , catalysis , physics
Abstract Results of a chromatographic study of the adsorption of N 2 and Kr on several molecular sieve adsorbents are reported. The objective was to find a suitable adsorbent for the removal of traces of radioactive Kr from the off‐gas from nuclear fuel reprocessing facilities. Of the adsorbents examined, de‐aluminated H ‐mordenite shows the highest selectivity for Kr relative to N 2 and appears to be a promising adsorbent for this separation. The presence of traces of NO 2 , a likely impurity in the off‐gas, was found to suppress the adsorption of N 2 more than that of Kr, thereby increasing the separation factor (α Kr/N 2∼ 12). In most of the adsorbents investigated, intracrystalline diffusion was too fast to measure but for N 2 in H ‐mordenite, intracrystalline resistance was found to be significant and strongly dependent on the initial dehydration temperature.