The presence of SO2 in coal-fired flue gas has adverse effects on the amine solutions used for CO2 capture. In addition, SO2 emissions in the atmosphere are also a primary source of pollution. In this study, the SO2 removal efficiency of three aqueous alkaline absorbents NaOH, Na2SO3, and CaO was studied using a membrane contactor. The morphology of the used membrane was examined using SEM and contact angle characterization techniques. Gas removal efficiency was studied within a feed gas flow rate of 0.5–5 m3/h, absorbent flow rate of 5–100 mL/min, and absorbent concentration of 0–0.01 mol/L. The gathered results showed that aqueous CaO has superior gas removal performance. It achieved a SO2 removal efficiency of 99.99 % at a concentration of 0.0025 mol/L, while the aqueous NaOH and Na2SO3 absorbents achieved 99.99 % removal efficiency at concentrations of 0.001 mol/L. Through comprehensive experimental work, the optimum operating parameters needed to achieve maximum SO2 removal efficiency were also determined. Furthermore, the durability of the membrane was tested in a four week continuous gas removal test and SEM images were recorded weekly to observe module morphology. The obtained results indicated that the membrane was quite durable and did not deteriorate noticeably.
|Original language||English (US)|
|Journal||Chemical Engineering and Processing - Process Intensification|
|State||Published - Jan 2020|
Bibliographical noteFunding Information:
The financial support from the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea(Next Generation Carbon Upcycling Project, Project No. 2017M1A2A2043151) is gratefully acknowledged.
The financial support from the N ational Research Foundation (NRF) funded by the M inistry of Science and ICT, Republic of Korea (Next Generation Carbon Upcycling Project, Project No. 2017M1A2A2043151) is gratefully acknowledged. Appendix A
© 2019 Elsevier B.V.
- Alkaline absorbents
- Membrane contactor
ASJC Scopus subject areas
- Chemical Engineering(all)
- Energy Engineering and Power Technology
- Industrial and Manufacturing Engineering