It is commonly accepted that CO2 capture is an effective way to combat climate change,as carbon capture and sequestration(CCS)could mitigate CO2 emission into the atmosphere with the possibility of continuously using fossil fuels without causing significant CO2 emissions.Membrane technology is a cost-effective and energy-efficient separation process for CO2 removal due to low capital cost,low energy penalty,and operational simplicity relative to other competitive technologies.However,most of the researches carried out for membrane CO2 capture are limited in lab scale.In this work,a series of hollow fiber membranes were firstly developed in lab scale with a membrane area of~10 cm2,among these developed membranes,the best one presented a CO2 permeance of~800 GPU coupled with a CO2/N2 selectivity of~40.The membrane with best separation performances was selected for further upscaling and in-site test in a cement plant.The second stage was to up-scale the membrane area to~200 cm2.The petroleum coke-fired flue gas generated in the Colacem cement plant in Gubbio(PG),Italy,was used as feed gas after a simple filtration to remove the suspended particulate matter without further pretreatment.The temperature for the membrane test ranges from 80 to 115 ℃.The effects of various parameters including operation temperature,pressure,sweep gas flow rate,vacuum grade,and the impurities in the feed were systematically investigated.Under optimized condition,CO2 content of 50%in the permeate and CO2 permeate flux of~5×10-3 cm3(STP)cm-2 s-1 were documented,which is comparable with other facilitated transport membranes and other commercially available CO2 separation membranes(e.g.,PolyactiveTM).The presence of impurities in the feed stream showed a negligible effect on the CO2 separation performance.Long-term stability was also studied through a test for a duration of 1 week at 90 ℃.