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Preparation and Surface Modification of PC Membranes for Gas Separation

Sedghi, Saeed | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39318 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Soltanieh, Mohammad; Goodarznia, Iraj
  7. Abstract:
  8. The gas separation properties of polycarbonate (PC) membranes were investigated in this study. These membranes were prepared via dry and dry-wet phase inversion technique. Pure O2, N2, and CO2 gases were permeated through prepared membranes. The effects of membrane preparation conditions, including solvent type, non-solvent type, non-solvent/solvent volumetric ratio, polymer weight fraction, and drying temperature on the gas separation properties of dry PC membranes were investigated using Taguchi experimental design. Taguchi analysis show that polymer weight fraction offers the most important effect on the separation characteristics of the dry PC membranes. To get the highest permselectivities of CO2/N2 or O2/N2, the amount of added non-solvent to the casting solution of dry membranes should be zero. On the other hand, the effects of non-solvent type, non-solvent/solvent volumetric ratio, initial evaporation time and temperature of coagulation bath on the gas separation properties of dry-wet PC membranes were investigated in this study. The results of these membranes show that by increasing non-solvent/solvent volumetric ratio, gas permeabilities increase. In contrast, gas permeabilities decrease and ideal gas selectivities increase as initial evaporation time of dry-wet membranes increases. Also, the results of these membranes show that by increasing temperature of coagulation bath, gas permeabilities increase. But, ideal gas selectivities decrease as temperature of coagulation bath increases. Moreover, permeability and permselectivity plots show that some specific types of prepared dry and dry-wet PC membranes have the potential for commercialization. SEM images of the cross section of prepared membrane show that they are integrally skinned asymmetric membranes with a thin dense layer at the glass side of the membrane
  9. Keywords:
  10. Polycarbonate ; Membranes ; Gases Separation ; Experimental Design ; Taguchi Method ; Dry Phase Inversion ; Dry-Wet Phase Inversion

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