Herein, we discuss carbon capture and utilization processes using industrial wastewater. 5, 10, and 30 wt% aqueous monoethanolamine (MEA) solutions were used as the absorbent solution. A pretreated brine solution, in which contained calcium ion with concentration of 21972.64 ppm, was used to supply calcium cations. All of the experiments were done under ambient pressure and in a temperature range between 298.15 K and 343.15 K. 0.79, 0.34 and 0.19 mol of CO2 was captured by 5, 10 and 30 wt% of aqueous MEA solutions, respectively. When 100 ml of pretreated brine solutions were added to each saturated MEA solution, 24.65%, 36.96%, and 41.65% (mol basis) of captured CO2 was converted to calcium carbonate salts by carbon fixation process. To investigate possibility of absorbent recycle after precipitation step, second absorption experiments were performed. As a result 0.55, 0.27, and 0.16 mol of CO2 were captured by 5, 10, and 30 wt% MEA solution, respectively. Through X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) analysis, it was proven that the calcium carbonate formation was possible and the majority of calcium carbonate was in the form of calcite.
Bibliographical noteFunding Information:
This research was supported by Global Ph.D. Fellowship Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2014H1A2A1021595) and also supported by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), Granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (No. 20154010200810).
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering