Performance Evaluation of Potassium Hydroxide-Glycerol Hybrid Solvent in Carbon Dioxide Absorption

Document Type : Research Article


Department of Chemical Engineering, Faculty of Engineering, Kermanshah University of Technology, Iran


Recently, the acid gas reactive absorption process by solvent used in the acid refining processes, comprehensively. In this experimental study, the carbon dioxide absorption process performed by a hybrid solvent, glycerol - potassium hydroxide in a packed tower. The effect of various factors, such as potassium hydroxide concentration (0.2-0.8 molar), glycerol concentration (4-12% wt.), and gas flow (2.3 and 1.7 l/min) at 35 ° C, 10% vol.  CO2 concentrate and atmospheric pressure have been investigated. CO2 absorption percentage, overall gas phase mass transfer coefficient and volumetric molar flux have been selected as responses. The results show that increasing the concentration of glycerol and potassium hydroxide in the mentioned operating conditions can decrease the outlet CO2 concentration. Percentage of carbon dioxide absorption by this hybrid solvent at a flow rate of 1.7 l/min, 12% wt glycerol, and 0.8 M potassium hydroxide, was 94.28%. Also, the maximum overall mass transfer coefficient based on the gas phase and volumetric molar flux in the mentioned conditions, 0.96 kmol/ m3.h.kpa at 0.8 M potassium hydroxide, 12% wt of glycerol, and the gas flow 2.3 l/min was obtained 0.96 kmol/m3.h.kPa and 67.65 kmol/m3.h.


Main Subjects

[2] Mumford, Kathryn A., et al. "Review of Solvent Based Carbon-Dioxide Capture Technologies." Frontiers of Chemical Science and Engineering, 9(2): 125-141 (2015).
[3] Aschenbrenner, Ortrud, and Peter Styring. "Comparative Study of Solvent Properties for Carbon Dioxide Absorption." Energy & Environmental Science, 3(8): 1106-1113 (2010).
[4] Mota-Martinez, Maria T., Jason Hallett, Niall Mac Dowell. "Screening Solvents Properties for CO2 Capture Based on the Process Performance." Energy Procedia, 114: 1551-1557 (2017).
]5[ مریم اسدی، حسین ابوالقاسمی، جذب دی‌اکسید کربن توسط محلول آبی هیدروکسید سدیم در ستون پرشده: ضریب انتقال جرم و میزان جذب، نشریه مهندسی شیمی ایران، دوره یازدهم، شماره شصت و دوم 27-33 (1391).
[6] Nagumo, Ryo, et al. "Molecular Dynamics Simulations for Systematic Prediction of the CO2 Solubility of Physical Absorbents." Journal of Chemical Engineering of Japan, 49(1): 1-5 (2016).
[7] Babamohammadi, Shervan, Ahmad Shamiri, Mohamed Kheireddine Aroua. "A Review of CO2 Capture by Absorption in Ionic Liquid-Based Solvents." Reviews in Chemical Engineering, 31(4): 383-412 (2015).
[8] Babamohammadi, Shervan, et al. "Solubility of CO2 in Aqueous Solutions of Glycerol and Monoethanolamine." Journal of Molecular Liquids, 249: 40-52 (2018).
[10] Valeh-e-Sheyda, Peyvand, Javad Barati. "Mass Transfer Performance of Carbon Dioxide Absorption in a Packed Column Using Monoethanoleamine-Glycerol as a Hybrid Solvent." Process Safety and Environmental Protection 146: 54-68 (2021).
[11] Alok, R., et al. "CO2 Capture Using Crude Glycerol-Derived Deep Eutectic Solvents." Advances in Energy Research, Springer, Singapore, 2: 735-743(2020).
[12] Shamiri, A., et al. "Absorption of CO2 into Aqueous Mixtures of Glycerol and Monoethanolamine." Journal of Natural Gas Science and Engineering, 35: 605-613 (2016).
[13] Lombardia, L, et al. "Carbon Dioxide Removal and Capture for Landfill Gas Up-Grading." Energy Procedia, 4: 465-472 (2011).
[14] Tippayawong, N., Thanompongchart, P., "Biogas Quality Upgrade by Simultaneous Removal of CO2 and H2S in a Packed Column Reactor." Energy, 35(12): 4531-4535 (2010).
[15] Zhao, Q., et al. "Purification Technologies for Biogas Generated by Anaerobic Digestion." Compressed Biomethane, CSANR, Ed, 24: (2010).
[16] Dey, Anindo, Adisorn Aroonwilas. "CO2 Absorption into MEA-AMP Blend: Mass Transfer and Absorber Height Index." Energy Procedia, 1(1): 211-215 (2009).
[17] Sema, Teerawat, et al. "Mass Transfer of CO2 Absorption in Hybrid MEA-Methanol Solvents in Packed Column." Energy Procedia, 37: 883-889 (2013).
[19] Baciocchi, Renato, Giuseppe Storti, Marco Mazzotti. "Process Design and Energy Requirements for the Capture of Carbon Dioxide from Air." Chemical Engineering and Processing: Process Intensification, 45(12): 1047-1058 (2006).‏