ScholarWorks@숙명여자대학교

초록

In this study, hydrogen was recovered and purified by using a membrane contactor unit from CO2-rich gas without the use of any basic chemicals such as amines. The membrane operational parameters were adjusted to achieve high CO2 removal and H-2 recovery. The effects of gas flow rate, pressure, gas composition (CO2/H-2 ratio), pressure difference between liquid and gas, and gas/liquid ratio on CO2 removal and H-2 recovery were investigated. Depending on the gas flow rate, the contact time between gas and liquid could be controlled, changing the absorption amounts of CO2 and H-2. Regarding gas composition, an increase in the CO2/H-2 ratio from 0.25 to 1 boosted H-2 recovery. Furthermore, increasing the CO2/H-2 ratio above 1 (from 1 to 3) generally reduced H-2 recovery from 98.7% to 83%. Additionally, supplementation with the optimal amount of additive enhanced CO2 removal and H-2 recovery. Thus, using a membrane contactor system results in high CO2 removal (82.7-93.5%) and H-2 recovery (91.5-98.7%). Moreover, H-2 production and separation can be performed in one system, implying that CO2 removal can be performed more efficiently by the membrane contactor. This study offers a new and promising route for producing high-purity H-2 while removing CO2.

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