PLASMA EXHAUST PURIFICATION - EXPERIMENTAL BASIS FOR A PROCESS CONCEPT
At KfK a process for the recovery of D,T from a noble gas stream containing up to 16 mol % of tritiated (Q-2, Q-2O, NQ-3, CQ-4 with Q = D,T) and non-tritiated impurities (He, Ar, O-2, CO, CO-2, etc ) is presently under investigation. In the first step CO is oxidized to CO-2 over a hopcalite bed at 120 degrees C. Under these conditions none of the oxidizable species, i.e. CQ-4, NQ-3, Q-2 undergo reaction. Species adsorbed on the hopcalite bed can be easily released by heating the bed up to 200 degrees C. Next, molecular oxygen and oxygen from water are gettered on a U bed at 250-300 degrees C. The gases are then sent through a Pd/Ag diffuser, where NQ-3 is decomposed quantitatively into N-2 and Q-2, the latter permeating out of the loop together with residual molecular Q-2 originally present in the noble gas stream. Finally, the gaseous mixture, now consisting of He, Ar, CO-2, N-2 and CQ-4, is passed over a Ni/A1-2O-3 catalyst held at 450-500 degrees C. On this catalyst CQ-4 is decomposed into the elements, the reaction becoming quantitative (DF-CQ4 > 1.3 x 106) if the produced hydrogen is continuously removed from the loop via the Pd/Ag diffuser.
Bibliographic Reference: 14TH SOFT CONFERENCE, AVIGNON (FRANCE), SEPT. 8-12, 1986 VOL. 1, PP. 367-372 1895 P., 1986, VOL. 1 AND VOL. 2, ISBN 0 08 034935 8 WRITE TO PERGAMON PRESS, HEADINGTON HILL HALL, OXFORD, OX3 0BW (UK), PRICE: UKL 220 (FOR BOTH VOLS.)
Record Number: 1989126048101 / Last updated on: 1989-01-01
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