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Equations of operating lines.

The liquid and vapour streams in the column are obtained as follows: Above the feed-point:

Liquid downflow, Ln = 5D = 277.8 Vapour up, V = 6D = 333.4 Below the feed-point, assuming the feed is liquid at its boiling point then:

Liquid downflow, Lm = Ln + F = (277.8 + 100) = 377.8 Vapour up, Vm = Lm - W = (377.8 - 44.44) = 333.4 The equations for the operating lines may then be written as:

below the feed plate: ortho:

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