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http://dx.doi.org/10.5322/JESI.2016.25.3.385

Degradation of Monoethanolamine during Continuous Operation of a Laboratory Scale CO2 Absorption System  

Kang, Ji-A (Department of Environmental Engineering, Kyungpook National University)
Woo, Wongu (Department of Environmental Engineering, Kyungpook National University)
Lim, Ho-Jin (Department of Environmental Engineering, Kyungpook National University)
Publication Information
Journal of Environmental Science International / v.25, no.3, 2016 , pp. 385-393 More about this Journal
Abstract
Oxidative and thermal degradation of alkanolamines for a promising $CO_2$ capture technology of absorption might cause decrease in $CO_2$ capture efficiency and formation of hazardous byproducts. In this study, characteristics of a representative absorbent of monoehtanolamine (MEA) were examined for a long term operation using a laboratory scale absorption system. An $CO_2$ absorption system with ID 56 mm and absorption zone height 100 cm was developed for the characterization. Absorption solution of 30 wt% MEA was circulated at 100 mL/min to treat air with 15% $CO_2$ and 1 ppm NO at 10 L/min. Temperatures of absorber and stripper were maintained at $40^{\circ}C$ and $120^{\circ}C$, respectively. For the course of 5 weeks continuous operation, MEA concentration was decreased approximately by 70% and $CO_2$ removal efficiency was dropped from 95% to 65%. Ionic byproducts of $NH_4{^+}$, $NO_2{^-}$, and $NO_3{^-}$ were accumulated up to 48 g/mL, 0.2 g/mL, and 1.5 g/mL, respectively, tracking the variation of MEA concentration. Formation of various organic byproducts were also observed.
Keywords
Alkanolamine; Monoethanolamine(MEA); Carbon dioxide; Absorption; Degradation;
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