So, Absolute alcohol is prepared by the distillation of a rectified spirit in the presence of $CaO$ which absorbs water content and finally contacting the solution with anhydrous copper sulphate removes the leftover traces of water.

How is absolute alcohol made?

Absolute alcohol is named to 100% conc. ethanol with chemical formula C2H5OH. And rectified spirit is a mixture with a composition of 95% ethanol and 5% water. To attain a pure form of absolute alcohol, one more separation step is required, so that the water content in rectified spirit is removed completely.

Is absolute alcohol and ethanol the same?

Ethanol is a volatile, flammable, colourless liquid with a characteristic odour. ... Absolute alcohol is a liquid alcohol that is at least 99% pure alcohol by weight. It is found in alcoholic beverages. Alcohol is commonly made by the fermentation of sugar by yeast or by petrochemical processes.