Experiments Study For CO₂Capture In A Polypropylen Hollow Fiber Membrane Contactor And Pore Wetted Analysis

CO2is significant as a key factor to the impacts of global warming. In China，CO2ismostly from the emissions of the coal-fired power plant flue gas. Therefore, it is one ofmitigation measures for greenhouse effect to capture CO2from the coal-fired power plant fluegas. Membrane-based gas absorption process will be worthy to pay close attention for itsadvantages: independent liquid and gas flow, less energy-consuming, easy-to-use, a very highsurface area to volume ratio, modular design of linear scale-up, highly selective and drivingforce for separation. In this paper, we have these conclusions.The experimental platform was established for testing the performance of CO2absorption in a polypropylene hollow fiber membrane contactor and examining the effect ofthe concentration and flow of absorption solution and the flow of the gas mixtures on theremoval CO2. It was found that the selected concentration of the absorption solution ishigher,the membrane is wetted more easily. Experimental results indicated that the CO2removal rate and transport efficiency increased as the concentration of the absorption solution.In practical use, the higher the concentration of the absorption solution is，the more highly thecorrosive.The experimental in the polypropylene hollow fiber membrane contactor showed thathow the concentration and flow of absorption solution and the flow of the gas mixtures affectthe membrane wetting. The compatibility between the polypropylene and the absorptionsolution is different. PG is the most compliant absorption solution. The CO2removal rate ofMEA, MDEA and PG had decreased by48.50%,59.44%and34.49%from the devicerunning to the membrane wetted and by41.28%,65.29%and23.78%from the membranewetted to the next measurement. It indicated that mass transfer efficiency decreased while themembrane was wetted. The removal system run steadily for a long time while distilled waterwas used as absorption solution for its physicalabsorption, but the the CO2removal rate is thelowest.The experimental in the hydrophobic modified polypropylene hollow fiber membranecontactor showed that the CO2removal rate and transport efficiency decreased at first, but thestable data could last for a long time. These can be explained that the membrane pore issmaller after the polypropylene hollow fiber modified,the roughness and the thickness of thehydrophobic modified polypropylene hollow fiber membrane increased and has excellentresistance to wetting, and the contact angle of absorption against modified membrane isbigger. The extent of the modified membrane affected by the concentration and flow rate of the absorption solution is smaller compared than the unmodified membrane. It means a higherconcentration and flow rate of absorption solution could be choosed for improving CO2removal removal and mass transfer efficiency. The CO2removal system with the modifiedmembrane is better from a long perspective...