Alkanes and olefins are mixed together. How to completely remove olefins without introducing new impurities?

If it is gas, bromine water is introduced to remove olefin gas, and then alkaline lime is introduced (to remove volatile bromine and water vapor).

If it is a liquid mixture, acidic potassium permanganate is added, and the olefin is oxidized into CO2 or water-soluble substances, and then separated.