In 2020, the amount of CO2 generated by coal
combustion
was estimated to be 15.32 Gt CO2. In a solvent-based postcombustion
CO2 capture (PCCC) process, the solvent regeneration/CO2 stripping process uses thermal energy to regenerate the solvent.
It has an adverse impact on the solvent’s thermal stability,
besides causing a significant quantity of solvent loss and a high
energy demand. In recent times, one method for PCCC cost savings has
emerged: sono-assisted solvent regeneration/CO2 stripping.
The present work focuses on enhancing the high-frequency ultrasound-assisted
aqueous carbon-rich 30 wt % monoethanolamine (MEA) solvent regeneration/CO2 stripping process using Fe2O3 hydrophobic
micronized particles (concentrations varied in the ranges of 0.005,
0.01, 0.05, 0.1, and 0.2 wt %) in a controlled-temperature environment
at 12 °C using 360 kHz, 470 kHz, and 1 MHz (streaming-dominant
frequencies). From the investigation, the lowest concentration (0.005
wt %) of micronized particles shows maximum enhancements of 12.29,
20.93, and 33.62%, thereby decreasing the solvent sensible energy
requirements by 1.26, 2.4, and 2.9 times than without micronized particles
for the tested frequencies. In addition, the observed CO2 stripping rate is much higher when compared to the case without
micronized particles. The stripping efficiency is observed to be high
in the initial stages of sonication (5 min).
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