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This work proposed using an adequate ionic liquid (IL) to weaken the affinity between NH and HO as a potential solution to the issue of high-energy consumption involved in separating NH gas from liquid HO. Two quaternary phosphonium-based ILs were selected according to an optimized regulation strategy. The regulation effects of the ILs were evaluated by the vapor-liquid equilibrium property of the NH + HO + IL systems, and were compared with the regulation effects of traditional additives. The results showed that the expected effects were achieved by adding ILs. The regulation mechanisms of different strategies were discussed with respect to the molecular structure and chemical equilibrium for the first time limited to the authors' latest literature review. Finally, the IR spectra of the NH + HO + IL systems were acquired and analyzed to verify the interactions of the ILs with NH and HO.

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