(186d) A Novel Membrane-Based Technology for Post-Combustion CO2 Capture and Recovery

Mulukutla, T. - Presenter, New Jersey Institute of Technology
Obuskovic, G., New Jersey Institute of Technology
Sirkar, K. K., New Jersey Institute of Technology

Conventional method for CO2 capture from post-combustion flue gas generally employs  an absorption and stripping process. The CO2 is absorbed for example in an aqueous solution of amine e.g., monoethanolamine and then stripped out in a separate tower with steam at 1200C. Such a process is highly energy intensive. Further the amine used is volatile. The low partial pressure of CO2 in the flue gas inhibits the application of CO2-selective membranes unless methods are employed to increase the CO2 partial pressure in the flue gas to be treated. Adsorption processes relying on adsorbent regeneration require among others the need to switch the flue gas between different columns. A number of other techniques are being studied to reduce the capital and operating costs for CO2 capture from post-combustion flue gas. We will describe a novel membrane-based technique to potentially bypass most of the shortcomings of many existing approaches. We have employed a simulated humidified flue gas containing around 14% CO2 and demonstrated successful removal of bulk of the CO2 and its recovery in a CO2-concentrated stream. We have characterized the performance of the membrane-based device used. We will deliberate on the strengths and weaknesses of this technology.