Abstract
In this study, the removal of carbon dioxide (CO2) that has a huge contribution to global warming from gas emissions was performed using absorption method. Effect of operational parameters such as temperature and gas flow rate on the absorption capacity (g CO2/kg solvent and mol CO2/mol MEA) was investigated in a bubble column reactor with a semi-batch operation. The monoethanolamine (MEA) was used as a solvent and absorption capacity was determined at different gas flow rates (2.5 and 5 L/min) and temperatures (25-35-45 oC). Because of the study, absorption capacities of 74.71 g CO2 / kg MEA and 0.51 mol CO2/mol MEA were obtained at 5 L / min gas flow rate, 25oC and 20% solvent concentration. The absorption capacity increases as the temperature decreases and as the flow rate increases. Because of the study, it can be concluded that the capture of CO2 into the MEA solution at bubble column can be successfully achieved with high absorption capacity.
Highlights
Because of the increasing industrialization and the need for energy in the world, our dependence on fossil fuels has increased, which causes an increase in carbon dioxide concentration in the atmosphere
The absorption capacity can be expressed in two units as mol of CO2 absorbed per mol of amine solution and as g CO2 absorbed per kg of amine solution
The absorption capacity of 66.27 g CO2/kg solvent and 0.456 mass of absorbed CO2 (mol CO2)/mol MEA decreases to 45.67 g CO2/kg solvent and 0.32 mol CO2/mol MEA with increasing temperature from 25 to 45 oC when using %20 MEA solution
Summary
Because of the increasing industrialization and the need for energy in the world, our dependence on fossil fuels has increased, which causes an increase in carbon dioxide concentration in the atmosphere. Various methods have been studied to reduce postcombustion CO2 emissions, such as chemical absorption (Heydarifard et al, 2020; Pang et al, 2021), physical absorption (Elhambakhsh et al, 2020), membrane separation (Widakdo et al, 2021; Yu et al, 2021), adsorption (Wu et al, 2021), cryogenic separation (Bi and Ju, 2021), algal system (Judd et al, 2015) In these processes, chemical absorption is extensively used for the removal of CO2 from flue gas by chemical reaction with a solvent (Chen et al, 2008). CO2 capture with a membrane is an interesting field of study but it still faces challenges in the form of the unavoidable tradeoff between permeability and selectivity, as well as poor resistance towards acid gases (Wibowo et al, 2021)
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