Method of preparing isopropyl alcohol

A method of preparing isopropyl alcohol, the method comprising:

• supplying a feed stream including a propylene monomer and water to a reaction unit and allowing a reaction to proceed to produce a reaction product including isopropyl alcohol, a propylene monomer, and water;
• supplying each of a first stream including a vapor phase reaction product and a second stream including a liquid phase reaction product that are discharged from the reaction unit to an absorption column of a purification unit;
• and
• circulating a third vapor phase stream including the propylene monomer discharged through an upper portion of the absorption column to the reaction unit, and supplying a fourth liquid phase stream including water and isopropyl alcohol discharged through a lower portion of the absorption column to an isopropyl alcohol purification unit,
• wherein the purification unit includes one or more heat exchangers, and
• when the third vapor phase stream is circulated to the reaction unit, the third vapor phase stream is converted from a vapor phase to a liquid phase through the one or more heat exchangers provided in the purification unit, and then transferred.