| 초록 |
Reducing ammonia loss is the key challenge in CO2 capture process using aqueous ammonia absorbent, and using additives containing amine and hydroxyl group is knowntoreduce ammonia loss in aqueous ammonia solution. However, there are no further researches on CO2 absorption kinetics with additives in ammonia solution for practical use. Herein, we investigated the effect of additives on CO2 absorption kinetics in wetted wall column. In this experiment, 5~12.5wt% of aqueous ammonia, 1wt% of additive, and 5~15% of CO2 were used and the temperature range was from 288K to 303K.Generally, the overall mass transfer coefficient was increased as temperature and concentration of ammonia solution increased. The CO2 mass transfer in absorbent with additives was better than in additive-free absorbent in low absorbent concentration and temperature region, while additive-free absorbent transferred CO2 more in high absorbent concentration and temperature region. This result was considered that hydroxyl group in additives played a hindrance role in reaction between CO2 and NH3. |
