PROCEDE PERFECTIONNE POUR ELIMINER L'IODE CONTENU DANS UNE ATMOSPHERE GAZEUSE

摘要

1361366 Gas separation; iodine oxyacids UNITED STATES ATOMIC ENERGY COMMISSION 3 Aug 1972 [26 Aug 1971] 36251/72 Heading C1A [Also in Division G6] Iodine or a compound thereof, e.g. methyl iodide, is removed from a gas by contacting the gas with a refluxing aqueous solution which is at least 15À3 M in nitric acid and is preferably at a temperature of 90-125‹ C. The method may be used for the removal of radio-active iodine from fission product-containing gas released from a nuclear reactor or from a spent fuel reprocessing plant. The acid may be contained in a flask surmounted by a reflux zone and two condensers, the condenser temperature being adjusted so that the gases NO and NO 2 are removed. Any residual iodine may be separated by a silver-containing zeolite. The iodine is converted to iodic acid which may be recovered from the nitric acid solution as HIO 3 , HI 3 O 8 , or I 2 O 5 ; alternatively the solution may be neutralized with alkali and the concentrated solution treated with nitrite to release elemental iodine.