Crude oil contains several harmful substances, which need to be removed in order to be processed. One such dangerous substance present in crude oil is hydrogen sulfide, H2S. H2S is very toxic, flammable and corrosive causing problems upstream, midstream and downstream in the oil and gas industry. H2S scavengers are used to eliminate this pollutant from crude oil. Hydrogen sulfide scavenger is specialized chemicals which are used in the purification of crude oil.