Application of the zone melting technique to metal chelate systems. XII. Computer-assisted consideration on the intermittent zone melting.

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The solute distribution profile on a columned charge of length L after m-cycles of the intermittent zone melting with j zones of length l, was computed for a range of distribution coefficient, k. The effects of j, l and k upon the separation efficiencies by this method were investigated in terms of the fractional length, α, which was refined to an required purity level, γ, in a limited number of m, and the fractional ratio, σ, of a solute amount which was concentrated into a limited portion of a fractional column length, β. The intermittent method is superior in respect to the separation efficiencies, α as well as σ, over the usual method, if a columned charge was zone-melted with the same number of zones of the same length at the same zone-travelling speed. Results of theoretical calculation were confirmed on systems of azobenzene in naphthalene and those of some metal acetylacetonates in the beryllium chelate of the same ligand compound.
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