New Amine-Based Membranes for CO2 Capture

讲座名称: New Amine-Based Membranes for CO2 Capture
讲座时间: 2018-04-21
讲座人: W.S. Winston Ho
形式:
校区: 兴庆校区
实践学分:
讲座内容: 讲座名称:New Amine-Based Membranes for CO2 Capture 讲座时间:2018-04-21 讲座地点:化工学院办公楼106室 讲座人: W.S. Winston Ho 院士,美国俄亥俄州立大学 讲座内容: This presentation covers new advances in amine-containing membranes for CO2 capture from flue gas in coal- and/or natural gas-fired power plants and from <1% CO2 concentration sources, e.g., the residual flue gas after the primary CO2 capture system and coal-mine gas streams.  The post-combustion carbon capture from flue gas requires a high CO2/N2 selectivity of 140 along with a very high CO2 permeance of about 700 GPU (1 GPU = 10-6 cm3 (STP)/(cm2 • s • cmHg)) or higher in order to use a stand-alone membrane process.  We have synthesized new membranes, showing a high CO2/N2 selectivity of >140 and a high CO2 permeance of >1000 GPU.  The membrane was scaled up to 14 inches in width using continuous roll-to-roll fabrication.  Aided by a material balance equation, three variables, namely the coating-knife gap setting, web speed, and coating solution concentration, were identified as the critical factors to control the membrane selective layer thickness.  This resulted in the membrane with a selective layer of <200 nm.  The scale-up membrane exhibited similar performance compared to the lab-size membrane.  The scale-up membrane was fabricated into spiral-wound membrane modules for testing with simulated flue gas containing about 20% CO2, 77% N2, 3% O2 and 1 – 3 ppm, showing similar results as the flat-sheet membrane tested in the lab.  Techno-economic analysis has shown that the post-combustion capture process using the membrane is promising for meeting DOE’s capture cost target set for 2025.  For carbon capture from <1% CO2 concentration sources, we have elucidated the carrier saturation phenomenon.  With reducing the CO2 concentration in the feed gas, both CO2 permeance and CO2/N2 selectivity increased.  These were mainly due to more available amine carriers for CO2 molecular transport at lower CO2 concentration conditions.  In addition, the stability and scale-up of membrane modules will be discussed.  (此次讲座可盖章)  
相关视频