An intensified process by coupling the carbonation reaction and solvent extraction was proposed for CO2 mineralization in CaCl2-rich solution to capture CO2 and generate CaCO3 and NH4Cl. Tributylamine was used as the extractant to remove HCl from aqueous phase and precipitate CaCO3. Experiments showed that the precipitation ratio of Ca2+ reached ca. 98% at 1400 s. The organic phase could be spontaneously separated from the aqueous phase immediately after extraction

and recycled by reacting with NH3·H2O with a tributylamine regeneration ratio of ca. 98%. In addition

the experiment using low CO2 concentration (i.e.

15% CO2 in N2) could also reach a high level of 98.31% at a reaction time of 2700 s

which exhibited the potential to integrate CO2 capture and CO2 storage in a one-step process. The particle size distribution of calcite and the observation of water-in-oil structures indicated that the formation of calcite was occurred in the water-in-oil structures. This process

with simple apparatus

no heat input

unrequired CO2 capture cost and production of valuable CaCO3 and NH4Cl

greatly reduced the costs of CO2 sequestration

and might be an alternative method to solve the primary problem of the conventional high-cost CCS technology.