DIFFUSION-COEFFICIENTS OF D-2 AND HT IN GASEOUS H-2 AND NAX ZEOLITE CRYSTALS

Experimental data for the effect on the unit-transfer height of the NaX zeolite grain size and the flow rate of a gaseous H-2-HT mixture in a sorption column during the separation in it of H isotopes are analyzed in order to determine the previously unpublished diffusion coefficients of HT in gaseous H-2 and crystals of this zeolite. The results are compared with the analogous coefficients for deuterium (D2). At 77 K and 0.1 MPa, the diffusion coefficients of HT and D2 in gaseous H-2 are approximately 0.155 cm2/set and 0.116 cm2/sec, respectively. The diffusion coefficients of these same isotopes at 77K in NaX zeolite crystals are approximately 1.42-10(-10) cm2/sec and 0.67-10(-10) cm2/sec.