(A) study on $CO_2$ absorption process using aqueous ammonia = 암모니아 수용액을 이용한 이산화탄소 흡수공정에 관한 연구

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Aqueous ammonia was investigated as a new absorbent of the chemical absorption process for $CO_2$ capture from combustion flue gas. The $CO_2$ solubility, the aqueous ammonia concentration and $CO_2$ loading was calculated using Pitzer model considering the precipitation. The precipitate in $CO_2$ loaded solution is analyzed qualitatively by NMR, and most of solid precipitates were ammonium bicarbonates. The $CO_2$ loading at equilibrium and the possibility of the precipitation was calculated with the different aqueous ammonia concentration. According to the results of calculation it is suggested that the absorption process using aqueous ammonia has best performance when it would be operated in the $CO_2$ loading region below 0.5 with over 5 m aqueous ammonia. The characteristics of $CO_2$ absorption into aqueous ammonia in a semi-batch were studied in terms of temperature and ammonia concentration. The effects of the temperature and concentration of aqueous ammonia on $CO_2$ absorption in a semi-batch reactor were studied by interpreting breakthrough curves. The appropriate temperature and concentration of aqueous ammonia for the $CO_2$ absorption process were around $26^\circ C$ and 13 wt%, respectively. Raman spectroscopy analysis of $CO_2$ loaded aqueous ammonia provided concentration changes of bicarbonate, carbonate, and carbamate as well as $CO_2$ sorption capacity at given time during the absorption with 13 wt% aqueous ammonia at $25^\circ C$. It was observed that carbamate formation was dominating at the early stage of absorption. Then, the bicarbonate formation took over the domination at the later stage while the carbonate remained unchanged. The comprehensive experiments on the performance of structured packing in $CO_2$ absorption application using ammonia solution were achieved. The volumetric overall mass transfer coefficient ( $K_Ga_v$ ) was investigated with an absorption column packed with high-efficiency gauze packing. The $K_Ga_v$ wa...
Hong, Won-Hiresearcher홍원희researcher
한국과학기술원 : 생명화학공학과,
Issue Date
303582/325007  / 020005063

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2008. 8., [ ix, 82 p. ]


aqueous ammonia; absorption; CO2; 암모니아 수용액; 흡수; 이산화탄소; aqueous ammonia; absorption; CO2; 암모니아 수용액; 흡수; 이산화탄소

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