To explore environmentally benign solvents for absorbing and using H2S, a series of caprolactam tetrabutyl ammonium bromide ionic liquids were synthesized, the solubilities of H2S in which were measured at 303.2−363.2 K and atmospheric pressure. The solubility of H2S in the ionic liquid (1:1 mole ratio) was 5.40% at 303.2 K and ambient pressure, decreased sharply as temperature increased, and increased with the increasing mole ratio of caprolactam. The absorption and desorption of H2S were practically reversible in the ionic liquids, which was characterized by nuclear magnetic resonance. Using air, hydrogen sulfide could be oxidized to elemental S in the ionic liquids, which makes it easier to recycle hydrogen sulfide. Caprolactam tetrabutyl ammonium bromide ionic liquids would be useful for removing and reusing H2S in pollution control and could be regarded as the most potential absorbent and recoverer of H2S.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.