Explains why finite equipment targets finite separation and why technical impurity is not synonymous with bad whiskey.
The product-domain discussion is converted into practical design limits.
The text states that pure components cannot be obtained at finite column height because real products contain residual impurities. At limiting flow ratios, pinch zones make the required transfer units or stages infinite; operation above the limit is selected by balancing separation, energy, flexibility, integration, and cost.
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4.2.4–4.2.5.2, Finite products, pinch zones, and optimal flow
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