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Hence TB is approximately 376 K, and since the feed is at 372 K it may be assumed to be all liquid at its boiling point.

4. Calculation of pinch temperatures.

The temperatures of the pinches are taken in the first place at one third and two thirds of the difference between the still and top temperatures.

Thus the upper pinch temperature, Tn = 343 + 0.33(416 — 343) = 367 K and the lower pinch temperature, Tm = 343 + 0.67(416 — 343) = 391 K

5. Calculation of approximate minimum reflux ratio. The calculations may be laid out as:

Component

Tn = 367 K a

Tm = 391 K a

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