Medium-pressure clathrate hydrate/membrane hybrid process for postcombustion capture of carbon dioxide.
Medium-pressure clathrate hydrate/membrane hybrid process for postcombustion capture of carbon dioxide.
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DOI：
10.1021/es071824k
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发表时间：
2008
影响因子：
11.4
通讯作者：
Praveen Linga;A. Adeyemo;P. Englezos
中科院分区：
文献类型：
--
作者：
Praveen Linga;A. Adeyemo;P. Englezos
提出了一种基于四氢呋喃(THF)存在下的水合物结晶的中压CO2捕集工艺。四氢呋喃降低了二氧化碳/氮气混合气体形成水合物的初始平衡条件。报道了0.5、1.0和1.5摩尔%四氢呋喃的相关热力学数据。此外，还实验测定了273.75 K时CO_2/N_2/四氢呋喃体系的水合物生成动力学以及CO_2的回收和分离效率。利用上述数据绘制了该工艺的框图。该过程包括三个水合物阶段和一个基于膜的气体分离过程。这三个水合物阶段在2.5兆帕和273.75 K下运行，这一运行压力大大低于在没有四氢呋喃的情况下所需的压力，因此压缩成本从典型500兆瓦发电厂发电量的75%降至53%。
This study presents a medium-pressure CO2 capture process based on hydrate crystallization in the presence of tetrahydrofuran (THF). THF reduces the incipient equilibrium hydrate formation conditions from a CO2/N2 gas mixture. Relevant thermodynamic data at 0.5, 1.0, and 1.5 mol % THF were obtained and reported. In addition, the kinetics of hydrate formation from the CO2/N2/ THF system as well as the CO2 recovery and separation efficiency were also determined experimentally at 273.75 K. The above data were utilized to develop the block flow diagram of the proposed process. The process involves three hydrate stages coupled with a membrane-based gas separation process. The there hydrate stages operate at 2.5 MPa and 273.75 K. This operating pressure is substantially less than the pressure required in the absence of THF and hence the compression costs are reduced from 75 to 53% of the power produced for a typical 500 MW power plant.