| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for recovering high-purity xenon from a radioactive exhaust gas by a simple process in a high efficiency using a small amount of an adsorbent and to concentrate krypton to a high concentration. SOLUTION: A radioactive exhaust gas containing xenon and krypton is passed through an NOx removing column 2, a water removing column 3 and a carbon dioxide gas removing column 4 to remove water, carbon dioxide gas and NOx. The treated gas is introduced into a xenon concentration column 5 and the obtained concentrated xenon gas is passed through a catalyst column 7 and a removing column 8 to remove hydrocarbons. The gas passed through the xenon concentration column 5 is introduced into a krypton concentration column 13 and the obtained concentrated krypton gas is introduced into a catalyst column 15 and a removing column 16 to remove hydrocarbons. The concentrated xenon gas and concentrated krypton gas free from hydrocarbons are purified and further concentrated with xenon purifying columns 9, 10 and 11 and krypton purifying columns 17 and 19.</p> |
