Improved CO2 Absorption in a Gas–Liquid Countercurrent Column Using a Ceramic Foam Contactor

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• 作者：Zhen Wang ; Mayank Gupta ; Sumedh S. Warudkar ; Kenneth R. Cox ; George J. Hirasaki ; Michael S. Wong
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：55
• 期：5
• 页码：1387-1400
• 全文大小：873K
• ISSN：1520-5045

文摘

Solid foams are porous, monolithic materials with higher specific surface areas than the random packings that are commonly used in amine-based CO₂ capture processes. In this work, the hydrodynamic characteristics (e.g., pressure drop, flooding point, and liquid holdup) and CO₂ absorption performance of α-Al₂O₃ ceramic foam packings of different porosities were investigated experimentally in a gas–liquid countercurrent column. With a 30 wt % diglycolamine (DGA) solvent as the CO₂ absorbent, the foams allowed higher flow rates of gas and liquid than a random packing before undesirable flooding was reached. Ceramic foams with lower porosities have larger operating capacities than those with higher porosities. A parametric study of a one-dimensional flow model was performed by investigating the effects of gas velocity, liquid velocity, and CO₂ solvent loading on the CO₂ removal performance. Lower gas velocities and higher liquid velocities increased the CO₂ removal efficiency. The CO₂ removal efficiency decreased with increasing initial CO₂ loading. The initial CO₂ loading of DGA solutions is recommended to be less than 0.35 mol of CO₂/mol of DGA to provide efficient CO₂ removal. Ceramic foams improve CO₂ absorption using liquid amines, which can lead to smaller carbon capture units.