Repeat Example 10-2 except calculate the diameter at the bottom of the column at a pressure of \(400.0 \mathrm{kPa}\). The surface tension of pure \(\mathrm{n}-\) heptane at \(20^{\circ} \mathrm{C}\) is 20.14 dynes \(/ \mathrm{cm}(0.0214 \mathrm{~N} / \mathrm{m})\), and the temperature coefficient is \(-0.0980 \mathrm{dynes} / \mathrm{cm} / \mathrm{K}\) (www.surface-tension.de). Use the DePriester chart to estimate bottoms temperature.

Example 10-2

Example 10-1

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Determine the required diameter at the column top for the distillation column in Example 10-1.