Amberlyst 15 ion-exchange resin is widely used in chemical synthesis as a catalyst for various organic reactions, including esterification, alkylation, and hydration. Its strong acidic properties make it effective in promoting reactions that require proton donation. In the petrochemical industry, it is employed for the purification and separation of hydrocarbons, as well as in the removal of impurities from feedstocks. Additionally, it finds application in water treatment processes for softening hard water by exchanging calcium and magnesium ions with sodium ions. Its stability under high temperatures and resistance to organic solvents make it a versatile choice in industrial and laboratory settings.