preparation of PDMS/PAN composite membrane for separation of CH4/N2

In this paper, a thin film poly dimethylsiloxane/polyacrylonitrile (PDMS/PAN) composite membrane was synthesized and used for gas separation. The membrane was consisted of a thin PDMS film (m) on a porous PAN support material. The support was prepared by phase inversion method. The effect of membrane preparation conditions including PAN concentration and phase inversion bath condition on the structure of the microporous support layer was studied. Then, the PDMS solution, containing cross-linker, catalyst, and solvent was coated on the support for several time by a brush, followed by heating at 90 °C for 2 h between each coating. The prepared PDMS/PAN composite membrane was used for permeation study of N2 and CH4. Permeability of N2 and CH4 and the ideal selectivity of CH4/N2 through the synthesized composite membrane were measured at various pressures (1-6bar). The results showed that the permeability was enhanced by pressure. Finally, the prepared membrane showed the ideal CH4/N2 selectivity more than 21.5 at 2 bars and 25 °C.

کلیدواژه ها:

PAN/PDMS ، Composite membrane ، Selectivity ، Permeability ، Methane