Abstract
The construction and operation of a continuous membrane diffusion column are described. The column allowed the suspension of large areas of cellophane in a zig-zag fashion so that thin films of solutions could be made to flow continuously on both sides of the membrane. Data are presented on the dialyzing efficiency of the apparatus and on the concentration contours of solutions processed. Thickness of the solutions, mixing, and time of travel on the column were found to give conditions such that the diffusion coefficients of the solutes rather than pore size of the cellophane could be made the controlling factor in the operation of the apparatus. On the basis of experimental data found, one design for use of the apparatus as a molecular rectifier is proposed.
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