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Consider a ternary mixture composed of chloroform, acetone, and methanol at 1 atm. This Demonstration plots the (blue) distillation line that corresponds to the composition profiles in a staged column at infinite reflux. You can drag the locator to change the position of this curve. This curve is found by solving the following equation: ... where ... is the liquid mole fraction of component ... at stage ... and ... is the vapor mole fraction of component ... at stage ... . The azeotropes (labeled in the figure by ... for ... from 1 to 4) and pure components appear as the fixed points of ... . It turns out that it is equivalent to finding the fixed points of equation (1) and the singular points of ... , which gives the residue curves or the composition profile in a packed column at infinite reflux.
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