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In the current aqueous monoethanolamine (MEA) technology, the presence of H2O, ~ 70 wt%, is considered as the major cause of energy consuming required for CO2 removal from flue gases.As a result, one key breakthrough in CO2 capture research is to develop processes that can lead to a substantial reduction in energy usage during CO2 regeneration.Phase-change solvents have the potential in substantial reduction of energy consuming since the absorbents can be separated from the solvents after CO2 capture and be separately regenerated in the solven-recycle process.In this study, we will develop new solvent based on amino acid salts, which can precipitate from the solvent and be recovered and regenerated so that reduce energy consuming for solvent generation.We screened several nature amino-acids and CO2 adsorption capacity and precipitate efficiency of each AA-based solvent was tested.The structure of the precipitate after reaction between amino-acid and CO2 was detected FTIR and XPS.A hypothetical phase-change mechanism was presented according to the result.