What You Need to Know
The McCabe–Thiele method is a technique that is commonly employed in the field of chemical engineering to model the separation of two substances by a distillation column. It uses the fact that the composition at each theoretical tray is completely determined by the mole fraction of one of the two components. This method is based on the assumptions that the distillation column is isobaric—i.e the pressure remains constant—and that the flow rates of liquid and vapor do not change throughout the column. The assumption of constant molar overflow requires that:The heat needed to vaporize a certain amount of liquid of the feed components are equal, For every mole of liquid vaporized, a mole of vapor is condensed, and Heat effects such as heat needed to dissolve the substance(s) are negligible.
Steps
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Alcohol purification (Global): Essential for producing high-proof spirits
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Essential oil extraction (France): Used in perfume industry for compound separation
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Petroleum refining (USA): Key method for hydrocarbon fractionation
The Science
Primary Reaction
Vapor-liquid equilibrium