Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Degradation of Monoethanolamine during Continuous Operation of a Laboratory Scale CO2 Absorption System

실험실 규모 이산화탄소 흡수장치의 연속운전시 모노에탄올아민 열화 특성

  • 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)
  • Received : 2015.10.19
  • Accepted : 2016.01.15
  • Published : 2016.03.31
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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.

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References

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