A compact statement of why feed plate, reflux, height, diameter, and cost must be evaluated together.
The author moves from thermodynamic feasibility to a practical binary-column design tradeoff.
Optimal feed location depends on feed phase and thermal condition and seeks to minimize mixing while preserving driving force. Practical flow selection balances falling equipment requirements against rising operating energy, while column height is governed by mass transfer and diameter by hydraulic capacity and flooding limits.
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4.1.3.3–4.1.3.4, Feed location and optimal flow ratios
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