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J 816 24 32 40 46 06 64 72 80 88 96100 Weight Per Cent Over

Fig. 11-5. True-&oiling-point curves of feed residuum distillate.

J 816 24 32 40 46 06 64 72 80 88 96100 Weight Per Cent Over

Fig. 11-5. True-&oiling-point curves of feed residuum distillate.

The true-boiling-point curves for the feed, the distillate, and the residue are given in Fig. 11-5. The curves for the liquids sampled from the plates are given in Fig. 11-6.

Lewis and Wilde's method consists of breaking the true-boiling-point curve of the feed up into fractions boiling within narrow temperature limits. Thus the feed is divided into 10 or 20°F. fractions and expressed as a component boiling between definite temperature limits, such as 420 to 430°F. fraction which is present to the extent of 1.5 weight per cent. Such cuts are then used as individual components by the methods given in Chap. 9. The true-boiling-point curve on any plate in the tower is constructed from the calculations for that plate, by simply recombining the cuts in the proportion that the calculations indicate.

The vapor above the plate of an actual column is not in equilibrium with the liquid leaving the plate owing to inadequate contact. In

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