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Separation of CO_2from N_2-CO_2Gas Mixture by Facilitated Liquid Membrane

Alihosseinpour, Hossein Ali | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41502 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Daruoosh
  7. Abstract:
  8. In this research, separation of carbon dioxide from a mixture of CO_2-N_2 with the aid of liquid membrane containing immobilized solution of diethanolamine-triethylene, known as facilitated liquid membrane, (DEA-TEG) in porous and hydrophilic poly vinylidene fluoride (PVDF) substrate was experimentally and theoretically carried out. The effects of DEA concentration, CO_2 partial pressure, and thickness of membrane on permeability coefficient, facilitation factor, permeation rate and selectivity of liquid membranewere investigated and importance of mass transfer resistance in gas phase on permeability or liquid membrane performance was also shown. Reversible reaction of complex formation between CO_2 and〖 N〗_2 in this modeling consists of a two-step carbamate formation mechanism.To predict the exact effects of DEA concentration and membrane thickness on performance of liquid membrane, all membrane features (such as diffusivity, solubility, viscosity, etc.) change with changes in membrane composition (DEA mass fraction). With about 14% (wt) DEA liquid membrane, maximum performance of CO_2 separationby this model was predicted.This model proves that thickness of membrane must be more than 0.0052cm ,in other words, chemical equilibrium is obtained at L= 0.0052 cm. Carbone dioxide partial pressure(P_(〖f,CO〗_2 )) range in the feed side was 12- 68 kPa and CO_2 permeability was 136-251 Barrer with a CO_2/N_2 separation factor of 25-250. The results of the model are compared with the experimental data in terms of permeability and selectivity and good agreement was observed between the model predictions and experimental results. Finally, to verify the generality of the model, the results predicted by the model were compared with experimental results obtained by Akira et al. in the separation of mixtures of carbon dioxide and methane. Slight difference between theoretical and experimental results indicates accuracy of the model
  9. Keywords:
  10. Experimental Results ; Diethanolamine (DEA) ; Carbon Dioxide Separation ; Facilitated Liquid Membrane ; Mass Transfer Modeling

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