Integrated Process of Monoethanolamine-Based CO₂ Absorption and CO₂ Mineralization with SFGD Slag: Process Simulation and Life-Cycle Assessment of CO₂ Emission

Abstract

Integrated CO 2 absorption and mineralization (IAM) is a promising approach to fix CO 2 in a far less energyintensive way. The semidry flue gas desulfurization (SFGD) slag containing a considerable amount of Ca(OH) 2 is potential for mineralizing CO 2 . In this work, an IAM process combining monoethanolamine (MEA)-based CO 2 absorption and mineralization with SFGD slag is proposed and investigated to provide a systematical evaluation of the net CO 2 fixation. A desorption efficiency of 68% and an entrainment efficiency of 32 wt % were experimentally determined. An entire IAM process model with a design specification of 8350 N m 3 /h flue gas feeding and a CO 2 fixation efficiency of 90% is simulated using Aspen Plus software. Net CO 2 fixation efficiency is analyzed through life-cycle assessment (LCA). A direct relationship between parameters and LCA of CO 2 emission is built based on parameter sensitivity analysis. The IAM process, achieving the goal of gaseous waste treatment with solid waste, shows significant environmental benefits in reducing CO 2 emission. MEA loss is the major contributor to CO 2 emission, and energy consumption follows. A net CO 2 fixation efficiency of 87.6% can be obtained with the optimized parameters. Reducing MEA loss would be effective to increase net CO 2 fixation efficiency of the whole process. This work provides a quantitative understanding of CO 2 fixation of the IAM process for industrial application and a guideline for further process optimization.

Upcycling Construction and Demolition Waste into Calcium Carbonates: Characterization of Leaching Kinetics and Carbon Mineralization Conditions

“…We also scaled up this process in a 20 L reactor, and the results were comparable to those of the 300 mL scale, and further development is required to improve the quality of the products. Furthermore, we plan to reuse and recycle the liquid used in the dissolution and carbonation process, and the salts will be concentrated by multiple cycles, which can be precipitated by adding ethanol or implementing electrolysis to get the required acid and base. − In future, we will optimize the integrated process to get a more sustainable and cost-effective process by applying life cycle assessment (LCA) and technoeconomic assessment (TEA) . According to our preliminary results of TEA, it shows that the cost of acid and base supply and the revenue from products are the most critical factors, and we will conduct a detailed assessment to carry out the sensitivity analysis of various effects on the CO 2 emissions and CO 2 avoidance cost.…”

Insights into the interaction between typical amines and alkaline minerals for improved CO2 absorption and mineralization

“…11 Extensive studies have demonstrated that compared to conventional CO 2 absorption and thermal regeneration technologies, IAM could achieve a larger regeneration efficiency and lower regeneration energy. [9][10][11][12][13][14][15][16][17][18][19] For example, previous studies reported that similar monoethanolamine (MEA) regeneration efficiencies (about 40%) were obtained through CaO-mediated IAM and traditional thermal regeneration. However, the later required >3.0 MJ/kg-CO 2 heat input while nearly zero additional heat was required for the IAM due to its thermodynamically downhill carbonation reactions.…”

“…1). 11 Extensive studies have demonstrated that compared to conventional CO 2 absorption and thermal regeneration technologies, IAM could achieve a larger regeneration efficiency and lower regeneration energy 9–19 . For example, previous studies reported that similar monoethanolamine (MEA) regeneration efficiencies (about 40%) were obtained through CaO‐mediated IAM and traditional thermal regeneration.…”

Indirect aqueous carbonation of CaSO4·2H2O with aspartic acid as a recyclable additive

“…In this context, Liu et al 21 reported a single-step direct aqueous carbonation method for CaO and CaSiO 3 , which was based on the use of sodium glycinate. This method adopted the integrated CO 2 absorption and mineralisation (IAM) technology, 22,23 which could reduce the energy consumption of glycinate regeneration through a chemical method instead of the traditional thermal method (i.e., eqn (3)-( 6)). According to their study, as shown in eqn (1), the dissolved CO 2 reacts with glycinate to generate the corresponding carbamate and zwitterionic ion.…”