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Attempted Separation of Hexenes by Distillation 795 of magnitude of the number of plates required, but consideration of the holdup and the 30 to 1 reflux ratio actually used in these distillations would certainly increase the estimates considerably.9Consideration of Holdup and Reflux Ratio.-All the above computations are on the assumption that reflux was nearly total and that holdup was zero so that the conclusions are for maximum sharpness of separation and minimum plates required. No statement of the holdup in the Podbielniak-Simons-Taylor® column is given but it must be appreciable compared with the amount of any one component and quite large compared (9) Arthur Rose, L. M. Welshans and . H. Long, Ind. Eng.Che.m., 32, May (1940).with the amounts of the components present in small amount so that the separations involving these would be expected to be much less sharp than the above discussion indicates. SummaryCalculations have been made to show that a minimum of 400 or more theoretical plates are required for sharp separation of certain close boiling hexenes, and that the use of a fractionating column with a small number of theoretical plates can produce no appreciable separation in such cases even with low holdup and high reflux ratio.

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