| 氨水混合吸收剂脱除CO2实验研究 |
| 摘要点击 3555 全文点击 1663 投稿时间：2013-11-20 修订日期：2014-01-20 |
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| 中文关键词 氨水 二氧化碳 混合吸收剂 吸收机制 |
| 英文关键词 aqueous ammonia carbon dioxide blended absorbent absorption mechanism |
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| 中文摘要 |
| 氨水作为一种很有应用前景的CO2化学吸收剂，存在吸收速率慢的问题. 使用湿壁塔实验台，考察了不同种类的添加剂（MEA、PZ、1-MPZ、2-MPZ）对氨水吸收CO2速率的影响. 结果表明，4种添加剂均能明显提高氨水吸收CO2的速率，其中PZ具有最好的促进效果. 0、0.1、0.3和0.5 mol·mol-1负荷下，3 mol·L-1 NH3+0.3 mol·L-1 PZ溶液的总传质系数（KG）分别是3 mol·L-1 NH3溶液在相应负荷下的3、3.2、3.2和2.9倍. 改变反应温度、添加剂量、PZ浓度等条件对基于NH3/PZ混合吸收剂吸收CO2的反应过程进行实验，得到了其在不同条件下的KG，初步探讨CO2吸收的反应机制，并计算出准一级反应速率常数为42.7 m3·（mol·s）-1. |
| 英文摘要 |
| A crucial problem for the promising absorbent aqueous ammonia (NH3) is the low CO2 absorption rate. The mass transfer coefficient (KG) of CO2 in aqueous NH3-based absorbents on a wetted wall column facility was investigated. Monoethanolamine (MEA), piperazine (PZ), 1-methyl piperazine (1-MPZ) and 2-methyl piperazine (2-MPZ) were introduced into NH3 solutions as additives, all of which significantly increased the mass transfer coefficient of CO2 in the solutions. With CO2 loading of 0, 0.1, 0.3, 0.5 mol·mol-1, KG of 3 mol·L-1 NH3+0.3 mol·L-1 PZ blended solution increased by 2, 2.2, 2.2, and 1.9 fold as compared to that of 3 mol·L-1 NH3. Typically, PZ, the additive with best performance, was chosen for further study. The effects of temperature and PZ concentration on CO2 absorption in PZ solution and the blended NH3/PZ solution. The calculated pseudo first order rate constant [42.7 m3·(mol·s)-1] was analyzed to further elucidate the reaction mechanism in the blended NH3/PZ solution. |
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