Experimental Study of Carbon Dioxide Absorption Using Aqueous Potassium Hydroxide Solutions

Document Type : Research Article


Faculty of Chemical Engineering, Oil & Gas, Iran University of Science and Technology, Tehran, I.R. IRAN


The chemical absorption technology is widely used in the industry to remove carbon dioxide post-combustion. It is necessary to develop and identify optimal chemical solutions to absorb more and reduce the absorption energy. The aqueous solutions of alkali metal hydroxides are considered by the researchers due to their low energy requirement and their compatibility with the environment in comparison with amine absorbers. In this research, hydroxide solutions, especially potassium hydroxide, have been used to absorb carbon dioxide. In absorption experiments, the effect of stirring and temperature on the absorption of carbon dioxide by aqueous hydroxide potassium in a laboratory-scale reactor has been studied. The results showed that with increasing stirring of the mixer from 50rpm to 150 rpm, the loading, absorption, and mass transfer flux of carbon dioxide increased 33%, 32%, and 36 respectively but the increase in the agitator over this amount would not have an effect on the absorption rate. The temperature increase was carried out in the range of 25-65°C with a 6 bar pressure, a concentration of 1.5 mol/L, and a stirring speed of 150 rpm. It was observed that increasing the temperature to half the absorption process increased the loading, absorption rate, and absorption flux of carbon dioxide, but the equilibrium parameters decreased slightly with increasing temperature. In fact, with temperature increasing from 22°C to 65°C, the equilibrium loading, adsorption rate and absorption flux of carbon dioxide decreased 15%, 2.4%, and 13%, respectively.


Main Subjects

[1] Songolzadeh M., Soleimani M., Takht Ravanchi M., Songolzadeh R., Carbon Dioxide Separation from Flue Gases: A Technological Review Emphasizing Reduction in Greenhouse Gas Emissions, The Scientific World J., 2014: 1-34 (2014).
[2] Heydarifard M., Pashaei H., Ghaemi A., Nasiri M., Reactive Absorption of CO2 into Piperazine Aqueous Solution in a Stirrer Bubble Column: Modeling and Experimental, Int. Journal Greenhouse Gas Control, 79: 91-116 (2018).
[3] Mirzaei F., Ghaemi A., An Experimental Correlation for Mass Transfer Flux of CO2 Reactive Absorption into Aqueous MEA-PZ Blended Solution, Asia-Pacific J. Chem. Eng., 13(6):     (2018).
[6] Fashi F., Ghaemi A., Moradi P., Piperazine-Modified Activated Alumina as a Novel Promising Candidate for CO2 Capture: Experimental and Modeling, Greenhouse Gases: Sci. Technol., 9: 37-51 (2018).
[7] Yılmaz, S., Selim H., A Review on the Methods for Biomass to Energy Conversion Systems Design, Renewable Sust. Energy Rev., 25: 420-430 (2013).
[8] Möllersten K., Yan J., Moreira J.R., Potential Market Niches for Biomass Energy with CO2 Capture and Storage—Opportunities for Energy Supply with Negative CO2 Emissions, Biomass and Bioenergy, 25(3): 273-285 (2003).
[9] Azar C., Lindgren K., Obersteiner M., Riahi K., van Vuuren D.P., Den Elzen K.M.G.J., Möllersten K., Larson E.D., The feasibility of Low CO2 Concentration Targets and the Role of Bio-Energy with Carbon Capture and Storage (BECCS). Climatic Change, 100(1): 195-202 (2010).
[10] Pashaei H., Ghaemi A., Nasiri M., Experimental Study and Modeling of CO2 Absorption into Diethanolamine Solutions Using Stirrer Bubble Column, Chem. Eng. Res. Design, 121: 32-43 (2017).
[11] Ghaemi A., Mass Transfer and Thermodynamic Modeling of Carbon Dioxide Absorption into MEA Aqueous Solution, Polish J. Chem. Technol., 19(3): 75-82 (2017).
[12] Yu C.-H., Huang C.-H., Tan C.-S., A Review of CO2 Capture by Absorption and Adsorption, Aerosol Air Qual. Res., 12(5): 745-769 (2012)
[13]  Pashaei H., Ghaemi A., Nasiri M., Heydarifard M., Experimental Investigation of the Effect of Nano Heavy Metal Oxide Particles in Piperazine Solution on CO2 Absorption Using Stirrer Bubble Column, Energy Fuels, 32 (2): 2037-2052 (2018).
[14]   Kazemi Sh., Ghaemi A., Tahvildari K., Chemical Absorption of Carbon Dioxide into Aqueous Piperazine Solutions Using a Stirred Batch Reactor, Iran. J. Chem. Chem. Eng. (IJCCE), 39(4): 253-267 (2020).
[15] Gouedard C., Picq D., Launay F., Carrette P.L., Amine Degradation in CO2 Capture. I. A Review, Int. J. Greenhouse Gas Control, 10:  244-270 (2012).
[16] Lepaumier H., Picq D., Carrette P.-L., Degradation Study of New Solvents for CO2 Capture in Post-Combustion, Energy Procedia, 1(1): 893-900 (2009).
[17]  Ghaemi A., Jafari Z., Etemad E., Prediction of CO2 Mass Transfer Flux in Aqueous Amine Solutions Using Artificial Neural Networks, Iranian J. Chemistry Chem. Eng. (IJCCE), 39(4): 269-280 (2020).
[18] Mumford, K.A., Wu, Y., Smith, K.H. and Stevens, G.W., Review of Solvent Based Carbon-Dioxide Capture Technologies, Frontiers Chem. Sci. Eng., 9(2): 125-141 (2015).
[19] Norfleet W., Horn W., Carbon Dioxide Scrubbing CapabiLies of Two New Non-Powered Technologies. Habitation, 9: 67-78 (2003).
[20] Matty C.M., "Overview of Long-Term Lithium Hydroxide Storage Aboard the International Space Station", Int. Conference Environ. Sys. (2008).
[21] Zeman, F., Energy and Material Balance of CO2 Capture from Ambient Air, Environ. Sci. Technol., 41(21): 7558-7563 (2007).
[22] Mahmoudkhani M., Keith D.W., Low-Energy Sodium Hydroxide Recovery for CO2 Capture from Atmospheric Air-Thermodynamic Analysis, Int. J. Greenhouse Gas Control, 3(4): 376-384 (2009).
[23] Baciocchi R., Storti G., Mazzotti M., Process Design and Energy Requirements for the Capture of Carbon Dioxide from Air, Chem. Eng. Proc.: Process Intensification, 45(12): 1047-1058 (2006).
[24] Stolaroff J.K., Keith D.W., Lowry G.V., Carbon Dioxide Capture from Atmospheric Air Using Sodium Hydroxide Spray, Environ. Sci. Technol., 42(8): 2728-2735 (2008).
[25] Gomes J., Santos S., Bordado J., Choosing Amine-Based Absorbents for CO2 Capture, Environ. Technol., 36(1): 19-25 (2015).
[26] Tirandazi B., Yahyaee A., Kianpour M., Shahhosseini S., Experimental Investigation and Modeling of Viscosity Effect on Carbon Dioxide Absorption Using Sodium Hydroxide, J. Environ. Chem. Eng., 5(3): 2597-2604 (2017).
[27] Masaki, K., On the CO2 Absorption Velocity of NaOH-and KOH-Solutions. The J. Biochem., 13(1): 211-217 (1931).
[31] Gondal S., Svendsen H.F., Knuutila H.K., Activity Based Kinetics of CO2–OH− Systems with Li+, Na+ and K+ Counter Ions, Chem. Eng. Sci., 151: 1-6 (2016).
[32] Krauβ M., Rzehak R., Reactive Absorption of CO2 in NaOH: Detailed Study of Enhancement Factor Models, Chem. Eng. Sci., 166: 193-209 (2017).
[33] Yoo M., Han S.-J., Wee J.-H., Carbon Dioxide Capture Capacity of Sodium Hydroxide Aqueous Solution., J. Environ. Management, 114: 512-519 (2013).