CO₂ Absorption from its Mixture Through Super-hydrophobic Membrane Contactor

摘要

Objective: The aim of this study is to evaluate the performance of super-hydrophobic hollow fiber membrane contactors to absorb CO₂ from its mixture with N₂ or CH₄ using 5 wt% diethanolamine (DEA) solution as absorbent. Methodology: During the experiment the absorbent flowed through lumen fibers, whilst the feed gas flowed through the shell side of the membrane contactor. Results: The experimental results demonstrated that the mass transfer coefficients, the fluxes and the amount of CO₂ absorbed increased with the absorbent and feed gas flow rates for CO₂-N₂ and CO₂-CH₄ feed gas system. The CO₂ absorption efficiency for both feed gas increased with the absorbent flow rate. The CO₂ absorption efficiency increased with feed gas flow rate for CO₂-N₂ system, but decreased for CO₂-CH₄ system. Conclusion: The overall mass transfer coefficient and the flux decreased with the number of fibers in the contactor, whilst, the amount of CO₂ absorbed and the CO₂ absorption efficiency increased.