A kinetic and process modeling study of CO2 capture with MEA-promoted potassium carbonate solutions
A kinetic and process modeling study of CO2 capture with MEA-promoted potassium carbonate solutions
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DOI：
10.1016/j.cej.2012.08.092
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发表时间：
2012-11
影响因子：
15.1
通讯作者：
Hendy Thee;Yohanes A. Suryaputradinata;K. Mumford;Kathryn H. Smith;G. Silva;S. Kentish;G. Stevens
中科院分区：
文献类型：
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作者：
Hendy Thee;Yohanes A. Suryaputradinata;K. Mumford;Kathryn H. Smith;G. Silva;S. Kentish;G. Stevens
碳酸盐如碳酸钾（K2 CO 3）的水溶液作为燃烧前和燃烧后捕集二氧化碳（CO2）的可行溶剂已得到广泛接受。然而，由于反应动力学差，速率促进剂被认为是必不可少的，以提高CO2吸收和水合碳酸氢盐的速率。使用一个很好的特点湿壁柱，我们已经评估了CO2吸收到K2 CO 3溶液促进与单乙醇胺（MEA）的条件下，类似于那些在工业CO2捕集厂的反应动力学。此处呈现的结果表明，在63°C下，添加少量MEA，1.1M（5 wt.%）和2.2M（10重量%），在30 wt.%的CO2吸收中加速了CO2的总吸收速率碳酸钾溶剂分别为16倍和45倍。CO2与MEA反应的Arrhenius公式为kMEA（M− 1 s −1）=4.24× 109 exp（−3825/T [K]），其中活化能为31.8kJmol−1。将我们的实验结果应用到白杨Plus™中，我们开发了一个E-NRTL模型，该模型可以复制中试工厂并模拟使用MEA作为捕获剂促进的K2 CO 3的工业捕获过程。
Aqueous solutions of carbonate salts such as potassium carbonate (K2CO3) have gained widespread acceptance as viable solvents for pre and post combustion capture of carbon dioxide (CO2). However, due to poor reaction kinetics a rate promoter is considered essential to improve the rate of CO2absorption and hydration to bicarbonate. Using a well characterized wetted-wall column, we have evaluated the reaction kinetics of CO2absorption into a K2CO3solution promoted with monoethanolamine (MEA) under conditions resembling those found at industrial CO2capture plants. Results presented here show that at 63°C the addition of MEA in small quantities, 1.1M (5wt.%) and 2.2M (10wt.%), accelerates the overall rate of absorption of CO2in a 30wt.% potassium carbonate solvent by a factor of 16 and 45 respectively. The Arrhenius expression for the reaction between CO2and MEA is kMEA(M−1s−1)=4.24×109exp(−3825/T [K]) where the activation energy is 31.8kJmol−1. Incorporating our experimental results into Aspen Plus™, we have developed an E-NRTL model that can replicate pilot plant and simulate industrial capture processes employing K2CO3promoted with MEA as the capture agent.