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Effect of Precipitation on Operation Range of the CO2 Capture Process using Ammonia Water Absorbent  

You, Jong Kyun (Department of Chemical and Biomolecular Engineering, KAIST)
Park, Ho Seok (Department of Chemical and Biomolecular Engineering, KAIST)
Hong, Won Hi (Department of Chemical and Biomolecular Engineering, KAIST)
Park, Jongkee (Chemical Process Research Center, KIER)
Kim, Jong-Nam (Chemical Process Research Center, KIER)
Publication Information
Korean Chemical Engineering Research / v.45, no.3, 2007 , pp. 258-263 More about this Journal
Abstract
Ammonia water was investigated as a new absorbent of the chemical absorption process for the removal of $CO_2$ in flue gas. The suitable range of ammonia water concentration and $CO_2$ loading ($mol\;CO_2/mol\;NH_3$) were decided in the point of view of $CO_2$ absorption capacity and $NH_4HCO_3$ precipitation. The absorption capacity of $CO_2$ and the precipitation of $NH_4HCO_3$ in liquid phase were calculated by the Pitzer model for electrolyte solution. The $CO_2$ absorption capacity of the ammonia water over $5\;molNH_3/kgH_2O$ was higher than that of conventional amine absorbent. The $CO_2$ loadings where precipitation occurred were decided at various absorbent concentrations. Theses values were higher than 0.5 in the concentration range of $5-14\;molNH_3/kgH_2O$ at 293, 313 K. The absorber for the removal of $CO_2$ in flue gas could be operated without $NH_4HCO_3$ precipitation by using high concentration of ammonia water below these $CO_2$ loading values. The optimum temperature of the ammonia water absorbent for removal of $CO_2$ in flue gas was 297-312 K depending on the concentration of ammonia water.
Keywords
Ammonia Water; Absorption; Carbon Dioxide; Precipitation; Pitzer Model;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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