The calculations in Example 10-3 were done for conditions at the top of the column. Physical properties will vary throughout the column, but columns are normally constructed with identical trays, downcomers, weirs, etc., on every stage (this is simpler and cheaper). For a 12 -ft diameter column, calculate entrainment, pressure drops, downcomer residence time, and weeping at the bottom of the column. The results of Problem 10. D2 are required. If the column will not operate, will it work if the gap between the tray and the downcomer apron is increased to 1.5 in.?

Example 10-3

Example 10-2

Example 10-1

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Determine the tray layout and pressure drops for the distillation column in Examples 10-1 and 10-2. Determine if entrainment or weeping is a problem and if the downcomers will work properly. Do these calculations only at the top of the column.