Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Variation of the CO2 Capture Reaction by Ammonia Solution with Temperature

온도에 따른 암모니아 용액에 의한 CO2 포집 반응의 변화 양상

  • Kim, Soo-Yeon (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Choi, Ye-Seul (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Kim, Dong-Su (Department of Environmental Science and Engineering, Ewha Womans University)
  • 김수연 (이화여자대학교 환경공학과) ;
  • 최예슬 (이화여자대학교 환경공학과) ;
  • 김동수 (이화여자대학교 환경공학과)
  • Received : 2011.09.30
  • Accepted : 2011.11.07
  • Published : 2011.11.30
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Abstract

The features of the capture reaction of $CO_2$ by ammonia solution have been investigated along with the effect of temperature on the reaction based upon computer program-utilizing calculation and thermodynamic estimation. The stable region of $CO{_3}^{2-}$ was observed to increase with temperature and the change of the stable region of $CO{_3}^{2-}$ with temperature was greater than the temperature variation of the stable region of other carbonate species. The distribution diagram for $NH_4{^+}-NH_3$ system was constructed and the rise of temperature resulted in the decrease of the stability of $NH_4{^+}$ ion, which was thought to be due to the endothermic nature of its acidic dissociation. Considering the introduction of $Ca^{2+}$ ion in the carbon capture reaction by $NH_4{^+}$, the temperature was observed to be important in the determination of the order of reaction between carbonate ion and these cations. The removal process of $CO_2$ gas by ammonia solution was presumed to occur in open system and the temperature variations of the concentration of carbonate system species along with their total concentration were calculated for the proper control and design of the real process.

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References

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