Add time:08/20/2019         Source:sciencedirect.com

With increasing of worldwide demand for natural gas, as one of the primary energy sources, the separation of CO2 from raw natural gas streams has caught high attention. Hollow fiber membrane contactors (HFMC) are known as the potential gas-liquid contactor for removal of CO2. In such systems, the role of liquid absorbent is crucial for effective CO2 separation. In the present work, 2D mathematical model was developed to investigate the separation behavior of CO2 from CO2/CH4 gas mixture using HFMC while considering 2-Methylpiperazine (cas 109-07-9) (2MPZ) as the promoter to potassium carbonate (K2CO3) absorbent. The model was successfully validated with available experimental data in the literature. It was found that increasing the concentration of 2MPZ from 0.1 to 0.5 kmol/m3 can significantly enhance the CO2 removal percentage up to 98%. The results also indicated that the rise in gas flow rate and CO2 inlet concentration decrease the CO2 removal rate. The results also revealed that increasing in absorbent flow rate, porosity to tortuosity ratio and number of membrane fibers can enhance the CO2 removal percentage.

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