I&EC 57 |
| As a post-combustion carbon dioxide separation and recovery process, absorption has been investigated by many researchers over the world. Successive operation process can be achieved by using effective absorption solvents. Currently, the most commonly used solvents are alkanolamines. However, alkanolamines still have many unresolved problems, such as expensive material price, absorbent degradation by oxygen and sulfur compounds in gas phase, and high regeneration energy required. Thus, various absorption solvents have been developed to provide economic and stable carbon dioxide separation and recovery process. Among the solvents, recently, ammonia water was proposed as the most effective and economic solvent for carbon dioxide separation and recovery process because of its low material cost and energy requirement for regeneration, and high reactivity with carbon dioxide. However, little information about its reaction characteristics with carbon dioxide is available so far. In this study, carbon dioxide absorption into aqueous ammonia solution was investigated with an absorption column packed with structured packings. Overall mass transfer coefficient was obtained from the absorption tests at different gas and liquid flow rates using ammonia water with various carbon dioxide loadings. Concentrations of carbon dioxide in gas phase and temperatures at several points along the absorption tower were collected and used for interpreting mass transfer performance of carbon dioxide into ammonia water. |
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IEC Poster Session
8:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Industrial & Engineering Chemistry |