In an investigation of t he physical properties of hydr<;>gen isotopes it was n.e cessar.\:' t o prepare 10 liters of high-purity. hydro~en d~u.tende. TI1JS was don e ~y r eactmg IJ t hlUm aluminum h ydride wit h deutenum oXIde, gly.;n~ hy dro~e n d eu tende, ]I) .t wo ba tc h~s, ?f 98.1-and 97.0-percent purity, respect ive!.\:' . .Ihls mater!ai was t hen frac t IOnated at JtqUJd hydrogen t emperature in t hree batches, Yleldmg the d esIred amoun t of h ydrogen de utende in a puri ty of 99.8 percent.
Apparatus was des igncd and constructed in which so me characteri stics of Stedman packing in t he d isti ll ation of hyd rogen isotopes were meas ured . The ave rage st ill hold-up and the hold-up at various boi l-up rates were measured usin g both hydrogen a nd de ute rium as still charge. Mixtures of hyd rogen-hydro gen deuteride of kn own compositi o n wcrc di stilled at boil-up rates of 454 millili ters p er hour a nd 1,190 milliliters pe r hour, res pective ly. From the dist ill ation data th e heigh t equivalent to a t heo retical plate was calcu lated and found to be 1.0 inch for t he 12-inch packin g used in these experiments.
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