Separation of isotopically substituted liquids in the thermal diffusion column

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Abstract
Isotopic separation of several liquid compounds was studied experimentally in a precisely constructed, 60‐cm thermal diffusion column at wall spacings of 0.254 and 0.383 mm. The systems studied were benzene, cyclohexane, carbon disulfide, 1‐chloropropane, and bromoethane. The measurements for benzene and cyclohexane included the C6H6–C6D6 and the C6H12–C6D12 pairs. The experiments were done under both static and flowing conditions in order to get experimental values of the initial transport coefficient and the remixing coefficient of the column for each system. The experimentally determined remixing coefficients were found to agree with those predicted from the theory of the thermal diffusion column. Experimental values of the thermal diffusion factor were obtained from the initial transport coefficients. A simple mass‐dependent relationship was found to be inadequate to describe the results even for different isotopic substitutions within the same compound. Results for the C6H6–C6D6 pair were found to agree quite well with recalculated results based on the early work of Korsching.