 With cyclohexane as the entrainer, the ternary azeotrope is 7% water, 17% ethanol, and 76% cyclohexane, and boils at 62.1 °C.Just enough cyclohexane is added to the water/ethanol azeotrope to engage all of the water into the ternary azeotrope.When the mixture is then boiled, the azeotrope vaporizes leaving a residue composed almost entirely of the excess ethanol.