Gomes João, Santos Samuel, Bordado João
a Chemical Engineering Department , ISEL-Instituto Superior de Engenharia de Lisboa , R. Cons. Emidio Navarro, 1959-007 Lisboa , Portugal.
Environ Technol. 2015 Jan-Feb;36(1-4):19-25. doi: 10.1080/09593330.2014.934742. Epub 2014 Jul 10.
CO2 capture from gaseous effluents is one of the great challenges faced by chemical and environmental engineers, as the increase in CO2 levels in the Earth atmosphere might be responsible for dramatic climate changes. From the existing capture technologies, the only proven and mature technology is chemical absorption using aqueous amine solutions. However, bearing in mind that this process is somewhat expensive, it is important to choose the most efficient and, at the same time, the least expensive solvents. For this purpose, a pilot test facility was assembled and includes an absorption column, as well as a stripping column, a heat exchanger between the two columns, a reboiler for the stripping column, pumping systems, surge tanks and all necessary instrumentation and control systems. Some different aquous amine solutions were tested on this facility and it was found that, from a set of six tested amines, diethanol amine is the one that turned out to be the most economical choice, as it showed a higher CO2 loading capacity (0.982 mol of CO2 per mol of amine) and the lowest price per litre (25.70 €/L), even when compared with monoethanolamine, the benchmark solvent, exhibiting a price per litre of 30.50 €/L.
从气态排放物中捕获二氧化碳是化学和环境工程师面临的重大挑战之一，因为地球大气中二氧化碳水平的增加可能是导致剧烈气候变化的原因。在现有的捕获技术中，唯一经过验证且成熟的技术是使用胺水溶液进行化学吸收。然而，鉴于此过程成本较高，选择最有效且同时成本最低的溶剂非常重要。为此，组装了一个中试测试装置，包括一个吸收塔、一个解吸塔、两个塔之间的热交换器、解吸塔的再沸器、泵送系统、缓冲罐以及所有必要的仪器仪表和控制系统。在该装置上测试了一些不同的胺水溶液，结果发现，在一组六种测试胺中，二乙醇胺是最经济的选择，因为它显示出更高的二氧化碳负载能力（每摩尔胺0.982摩尔二氧化碳）和最低的每升价格（25.70欧元/升）。即使与作为基准溶剂的单乙醇胺相比，单乙醇胺每升价格为30.50欧元/升。
