Research article
Vol 1 No 1 (2007): Volume 1, Number 1, 2007
Absorption characteristics of solvents for carbon dioxide capture
Chemical Engineering Department, Gadjah Mada University, Jl. Grafika 2, Yogyakarta 55281, Indonesia
Department of Chemical Engineering,Norwegian University of Science and Technology N-7491 Trondheim, Norway
SINTEF Applied Chemistry, N-7465 Trondheim, Norway
Abstract
This study focuses on the absorption characteristics of solvents for CO2 capture. The objective is to develop new and more efficient solvents or solvent mixtures with higher absorption rates and loading capacities than existing ones. CO2 absorption was investigated at 40°C using both alkanolamine-based and non-alkanolamine-based solvents. The absorption characteristics, crucial for CO2 removal, depend on the absorption rate and capacity of the solvents. All absorbents are compared to the commercially used MEA. Experimental results reveal that most tested absorbents exhibit poorer performance than MEA. However, a 30-wt% AEEA in aqueous solution emerges as a potential contender, demonstrating superior absorption characteristics. In comparison to 30-wt% MEA, the 30-wt%- AEEA shows a higher absorption rate from a loading of 0.35 and increased absorption capacity (0.82 mol CO2/mol AEEA and 0.47 mol CO2/mol MEA at 9.5 kPa CO2 partial pressure).
References
Astarita, G., Savage, D. W., Bisio, A., 1983, "Gas Treating with Chemical Solvents." John Wiley & Sons, New York.
Austgen, D. M., Rochelle, G. T., Chen, C., 1991, "Model of Vapor-Liquid Equilibria for Aqueous Acid Gas-Alkanolamine Systems. 2. Representation of H2S and CO2 Solubility in Aqueous MDEA and CO2 Solubility in Aqueous Mixtures of MDEA with MEA or DEA." Ind. Eng. Chem. Res., 30, 543-555.
Bishnoi, S., Rochelle, G. T., 2000, "Absorption of Carbon Dioxide into Aqueous Piperazine: Reaction Kinetics, Mass Transfer, and Solubility." Chem. Eng. Sci., 55, 5531-5543.
Buckingham, P. A., 1964, "Fluor Solvent Process Plants: How They are Working." Hydro. Process., 43, 113-116.
Bucklin, R. W., 1982, "DOA - A Workhorse for Gas Sweetening." Oil & Gas J., Nov 8, 204-210.
Deshmukh, R. D., Mather, A. E., 1981, "A Mathematical Model for Equilibrium Solubility of Hydrogen Sulfide and Carbon Dioxide in Aqueous Alkanolamine Solutions." Chem. Eng. Sci., 36, 355-362.
Fluor Co. Gas Processing. www.fluor.com/industries/gas_aboutasp (1 September 2003).
Huval, M., van de Venne, H., 1981, "DOA Proves Out as Low-Pressure Gas Sweetener in Saudi Arabia." Oil & Gas J., Aug 17, 91-103.
Kohl, A., Nielsen, R., 1997, "Gas Purification." Gulf Publishing Company, Houston.
Kumar, P. S., Hogendoorn, J. A., Ferro, P. H. M., Versteeg, O. F., 2002, "New Absorption Liquids for the Removal of CO2 from Dilute Gas Streams using Membrane Contactors." Chem. Eng. Sci., 57, 1639-1651.
Li, Y., Mather, A. E., 1997, "Correlation and Prediction of the Solubility of CO2 and H2S in Aqueous Solution of Methyldiethanolamine." Ind Eng. Chem. Res., 36, 2760-2765.
Liu, Y., Zhang, L., Watanasiri, S., 1999, "Representing Vapor-Liquid Equilibrium for an Aqueous MEA-CO2 System using the Electrolyte Nonrandom-Two-Liquid Model." Ind Eng. Chem. Res., 38, 2080-2090.
Savage, D. W., Funk, E. W., Yu, W. C., Astarita, G., 1986, "Selective Absorption of H2S and CO2 into Aqueous Solutions of Methyldiethanolamine." Ind. Eng. Chem. Fundam., 25, 326-330.
Suda, T., Iijima, M., Tanaka, H., Mitsuoka, S., Iwaki, T., 1997, "Countercurrent Absorption of CO2 in a Real Flue Gas into Aqueous Alkanolamine Solutions in a Wetted Wall Column." Environmental Prog., 16, 200-207.
Suda, T., Iwaki, T., Mimura, T., 1996, "Facile Determination of Dissolved Species in CO2-Amine-H2O System by NMR Spectroscopy." Chem. Lett., 9, 777-778.
Tensdh, A. S., Saltnes, T., Tveter, N. E., Oksholen, T., Dragland, A., Aspbjell, A., 2002, "Looking for the Justice." Gemini, 4, 22-24.
