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Received August 31, 2010
Accepted July 18, 2011
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Effect of addition of weak acids on CO2 desorption from rich amine solvents
1Maritime College, Chongqing JiaoTong University, Chongqing 400074, China 2School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China 3School of Mechanical and Mining Engineering, The University of Queensland, St. Lucia, Qld 4072, Australia
b.feng@uq.edu.au
Korean Journal of Chemical Engineering, March 2012, 29(3), 362-368(7), 10.1007/s11814-011-0184-4
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Abstract
Experiments were conducted to study the effect of addition of four weak acids (adipic, suberic, phthalic and sebacic acids) on the regeneration of three types of CO2-loaded rich solvents (Monoethanolamine (MEA), Diethanolamine (DEA) and Methyldiethanolamine (MDEA)). It was found that CO2 could be released faster and in a larger quantity when the amount of acid added to the solvent was increased while other desorption conditions were maintained unchanged. Adipic acid appeared to be more effective than phthalic, suberic and sebacic acids in enhancing solvent regeneration rate. Among the three amines investigated, MEA had the highest CO2 desorption rate, while DEA saved the most energy. The effect of adipic acid residue in the MEA solvent on CO2 absorption was also investigated. The residue acid reduced the absorption capacity of the MEA solvent significantly when the solvent concentration was low and slightly when the concentration was high.
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References
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