Experimental study on the cyclic mineralization of CO₂ enriched phase after absorption by a novel biphasic absorbent composed of DEEA and AEP

The high energy consumption of Carbon Capture Utilization and Storage(CCUS) promotes the research of integrated absorption and mineralization technology. A novel DEEA/AEP biphasic absorbent is used to absorb \(\hbox {CO}_{2}\) . After phase separation, only one phase enriched with the absorption product is sent into the mineralization system, then reacts with \(\hbox {Ca(OH)}_{2}\) to produce \(\hbox {CaCO}_{3}\) at normal temperature and pressure. The effects of temperature, Ca/C and dispersion of the system were investigated, and cyclic utilization experiment was also conducted. The process was characterized and analyzed by Thermal gravimetric analysis (TGA), X-ray diffraction (XRD), and nuclear magnetic resonance (¹³C NMR). The results showed that at 50 \(^{\circ }\) C, Ca/C = 1, the extent of mineralization of \(\hbox {CO}_{2}\) -enriched phase mineralization was 95.73% after ultrasonic treatment for 30 min. During 6 cycles, the volume percentage of \(\hbox {CO}_{2}\) -enriched phase could be maintained at 52–55%, and the \(\hbox {CO}_{2}\) load was 11.92mol/L. The results above indicate that the \(\hbox {CO}_{2}\) -enriched phase mineralization technology after absorption by biphasic absorbent can effectively capture \(\hbox {CO}_{2}\) , realize recycling, and reduce CCUS energy consumption.