In azeotropic distillation, why is an entrainer added?

In azeotropic distillation, why is an entrainer added? Correct Answer To form a minimum boiling point azeotrope

In the separation of acetic acid with water, -butyl acetate is added which acts as an entrainer and forms two liquid, minimum boiling point azeotrope with water. It is then overhead and condensed and separated in acetate and water layers.
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