Describing CO₂ mass transfer in amine/ammonia mixtures — No shuttle mechanism required

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• 作者：Graeme Puxty ; ^a ; ^{graeme.puxty@csiro.au} ; Robert Rowland^a ; Moetaz Attalla^a
• 关键词：Mass transfer ; Wetted-wall ; Modelling ; Amine mixtures
• 刊名：Energy Procedia
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：4
• 期：Complete
• 页码：1369-1376
• 全文大小：520 K

文摘

The most common method of CO₂ capture is the absorption of CO₂ into a falling thin film of an aqueous amine solution. Modelling of mass transfer during CO₂ absorption is an important way to gain insight and understanding about the underlying processes that are occurring. In this work a new software tool has been used to model CO₂ absorption into aqueous MEA, PZ, NH₃ and binary mixtures of PZ with AMP or NH₃. The tool solves partial differential and simultaneous equations describing diffusion and chemical reaction automatically derived from reactions written using chemical notation. It has been demonstrated that by using reactions that are chemically plausible the mass transfer in binary mixtures can be described by combining the chemical reactions and their associated parameters determined for single amines. The observed enhanced mass transfer in binary mixtures can be explained through chemical interactions occurring in the mixture without need to resort to using additional reactions or unusual transport phenomena (e.g. the shuttle mechanism).