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BIONDO, LUCAS D.; DUARTE, JOCELEI; ZENI, MARA  and  GODINHO, MARCELO. A Dual-mode model interpretation of CO2/CH4 permeability in polysulfone membranes at low pressures. An. Acad. Bras. Ciênc. [online]. 2018, vol.90, n.2, pp.1855-1864. ISSN 1678-2690.

An asymmetric membrane of polysulfone (PSf) was synthesized by phase inversion method. Permeation experiments were carried out between 2 to 5 bar pressure, and at temperatures 20 to 45°C. The dense-selective layer of PSf membrane presents regular thickness (about 5 µm), and was not possible to observe the formation of macrovoids in porous layer. The CO2 permeability through membrane was 18.8 Barrer at 35°C and 2 bar pressure, and this relationship between the pressure and the CO2 permeability was described adequately by Dual-mode model. The absence of CH4 permeability at 2 and 3 bar pressure, qualifies the PSf membrane for gases separation with high selectivity in this range.

Keywords : asymmetric membranes; CO2/CH4 permeability; Dual-mode model; polysulfone.

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