The residue curve map of Figure 12.9(a) shows that batch distillation of a mixture at the azeotropic composition for the system (A + B) with a small amount of C added will result in a very pure liquid C residue in the still. Is this a good separation unit choice to obtain “pure” C? Analyze the advantages and disadvantages.

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A B A B (a) (c) A B B Boundary (b) Boundary (d) Figure 12.9 Some Possible Azeotropic Situations for Ternary Systems