| 摘要 |
<p>1509581 Separating rare gases COMMISSARIAT A L'ENERGIE ATOMIQUE 30 June 1975 [31 July 1974 17 April 1975] 27601/75 Heading F4P To separate radio-active rare gases, e.g. krypton and xenon from a mixture in air, the mixture is distilled to produce a mixture of the rare gases in solution in liquid oxygen. The rare gases are freed from oxygen by adding hydrogen and catalytically reacting the mixture to form water which is condensed and removed, the xenon and krypton then being separated by fractionation. In detail, the solution of rare gases is heated at E1, Fig. 2a (not shown) to 500‹ C. after removal of CO 2 , NO and NO 2 by scrubbing, and passed to catalytic reactor A1 to convert any hydrocarbons to H 2 O and CO 2 and N 2 O to N 2 and O 2 . The mixture is cooled, compressed, water is extracted, the mixture being further cooled and introduced to distillation column K1, Fig. 2b (not shown), to remove some O 2 and any N 2 . The resultant mixture may be passed through an ozone trap, and then mixed with a stream of hydrogen and introduced to a catalytic combustion chamber A 2 , Fig. 2c (not shown). The mixture is freed of water by cooling, then the krypton and xenon are preferably freed of hydrogen by freezing in alternating freezers F 2 , F 3 . The krypton and xenon is recovered from the freezers by warming, and fed to a column K 2 in which the krypton and xenon are separated.</p> |
