化工学报2025，Vol.76Issue(5)：2358-2366,9.DOI:10.11949/0438-1157.20241317
不同吸附剂对低浓度Kr气的选择性吸附与纯化
Selective adsorption and purification of low-concentration Kr gas using various adsorbents
陶春珲 1李印辉 1傅钰 1段然 1赵泽一 1唐羽丰 1张罡 2马和平1
作者信息
- 1. 西安交通大学化学工程与技术学院,陕西 西安 710049
- 2. 中核四〇四有限公司,甘肃 嘉峪关 735100
- 折叠
摘要
Abstract
Kr-85 is a widely used and valuable β-radionuclide,mainly present in the tail gas of spent fuel reprocessing.The recovery and purification of Kr-85 not only mitigate the environmental impact of radioactive gases,but also yield high-activity radiation sources.This study proposes a method to concentrate trace amounts of Kr in off-gas streams via low-temperature adsorption using different porous adsorbents,followed by further purification through chromatography to obtain high-purity Kr gas.Nano-scale pure silica MFI zeolite(Si-MFI)was synthesized,and its low-temperature adsorption-separation capacity for Kr gas was compared with various other adsorbents.The results indicate that Si-MFI exhibits the best adsorption-separation performance for Kr gas at 195 K.Consequently,Si-MFI was selected as the adsorbent for this study.Furthermore,the feasibility of the proposed approach was validated through breakthrough experiments in a fixed-bed setup and a custom-designed low-temperature Kr recovery apparatus.The results demonstrate that the device and the cryogenic enrichment-chromatographic purification process can effectively recover Kr from simulated exhaust gas with a concentration of 0.005%(vol).The purified Kr product is virtually free of nitrogen and oxygen impurities,thereby confirming the feasibility of the process.关键词
气体/吸附/纯化/沸石/氪气/乏燃料气/气体分离Key words
gas/adsorption/purification/zeolite/krypton/spent fuel gas/gas separation分类
化学化工引用本文复制引用
陶春珲,李印辉,傅钰,段然,赵泽一,唐羽丰,张罡,马和平..不同吸附剂对低浓度Kr气的选择性吸附与纯化[J].化工学报,2025,76(5):2358-2366,9.
