The Role of SO₂ in the Chemistry of Amine-based CO₂ Capture in PCC

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• 作者：Yaser Beyad ; Robert Burns ; Graeme Puxty ; Marcel Maeder
• 关键词：PCC ; monoethanolamine ; sulfur dioxide ; cyclic capacity ; kinetics
• 刊名：Energy Procedia
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：37
• 期：Complete
• 页码：1262-1266
• 全文大小：223 K

文摘

Most coals contain a certain amount of sulfur. Upon combustion most of the sulfur is initially oxidized to SO₂ and later to SO₃ and sulfuric acid. If gaseous SO₂ enters the PCC (post combustion capture) plant it is immediately absorbed into the amine solution and transformed initially into sulfurous acid which dissociates into protons and the sulfite ion, SO₃^2?. The protons and sulfite remain in the amine solution and is slowly accumulating over time. In this investigation we investigated the long term effect of dissolved SO₂ in MEA (monoethanolamine) solutions kept at 100 ¡ãC; we investigated the effect by following the NMR spectrum of the solution. Additionally we modeled the effect of increasing amounts of accumulated SO₂ on the cyclic capacity of the MEA solution as well as the reaction kinetics of dissolved CO₂.