Study on concentrating sulfuric acid solution by membrane distillation with metal-PTFE composite membrane

Abstract

concentrating sulfuric acid by membrane distillation in a flat-sheet direct-contact membrane distillation device with a self-made metal-PTFE composite membrane has been studied. The effect of sulfuric acid concentration of feed, the flowrate and liquor temperature in high-temperature side and low-temperature side on the flux and separation efficiency is investigated. The stability of this composite membrane is also inspected. The experimental results show that the metal-PTFE composite membrane can be used in membrane distillation, and its properties are very stable. It is feasible to concentrate sulfuric acid by membrane distillation with this membrane.

Keywords

metal-PTFE composite membrane / membrane distillation / sulfuric acid

References

[1] WuYongnie. Membrane distillation and related membrane process. Membrane Science and Technology, 1988, 8(2): 43-48

[2] XuYouyi, XiangHui, ChenYuansheng, et al.. The study and development of membrane distillation. Membrane Science and Technology, 1998, 18(6): 1-5

[3] SchofieldR W, FaneA G, FellC J D, et al.. Factors affecting flux in membrane. Desalination, 1990, 77: 279-294

[4] Chmielewski A G, Harasimowicz M, Zakrzewska-Trznadel G. Concentration of radioactive components in liquid low-level radioactive wastes by membrane distillation. ICMST’98, Beijing, 1998. 119–120

[5] BanatF A, SimandlJ. Theoretical and experimental study in membrane distillation. Desalination, 1994, 95: 39-52

[6] ShojiK, Shin-ichiN. Transport phenomena in membrane distillation. J Mem Sci, 1987, 33(3): 285-297

[7] MariaTomaszewska. Concentration of the extraction fluid from sulfuric acid treatment of phosphogypsum by membrane distillation. J Mem Sci, 1993, 78: 277-282

[8] Luo Aiping, Zhang Qixiu. Preparation of inorganic/organic composite membrane by coating teflon on metallic membrane. ICMST’98, Beijing, 1998. 238–239