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Preparation and Performance Assessment of Polymer-SAPO-34 Mixed Matrix Membrane for Separation of CO2 from Other Gases

Meshkat Alsadat, Shadi | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46279 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Soltanieh, Mohammad; Mohammadi, Aliasghar
  7. Abstract:
  8. In this research incorporation of SAPO-34 zeolite filler into polycarbonate membrane was investigated for fabrication of mixed matrix membrane (MMM). The main purpose of addition of zeolite in polymer matrix is to enhance the separation properties of pure membrane by means of the selective pores of SAPO-34. SAPO-34 possesses pores with proper size for separation of CO2 from CH4 by molecular sieving mechanism. Pure polycarbonate membrane and PC/SAPO-34 MMM was prepared by solvent evaporation method using dichloromethane as solvent. Zeolite loading was varied between 5-30%wt. First of all, polycarbonate was characterized by DSC, FTIR and viscometer analysis in order to determine all the required characterization. Membranes were also characterized by DSC and SEM analyses. Single gas permeability measurements of CO2, CH4 and N2 were conducted in the pressure of 5 bar and ambient temperature. Incorporation of zeolite in polymer matrix slightly increased CO2 permeability but decreased CH4 and N2 permeability. Ideal selectivities of CO2/CH4 and CO2/N2 were remarkably improved by the addition of zeolite. The membrane with higher zeolite loading (30%wt.) exhibited the highest ideal selectivity. DSC analysis of pure membrane and MMM revealed a slight increase in Tg by addition of zeolite. This slight increase may be due to partial polymer-zeolite interaction while polymer chain rigidification around zeolite particles did not significantly occur. SEM images exhibited partial void formation in 20 and 30%wt. MMMs while proper polymer-zeolite adhesion in 5 and 10%wt. MMMs and in most parts of 20 and 30%wt. MMMs was obvious. Investigation of the effect of operating temperature on separation properties of MMM showed that permeability of all gases improved and ideal selectivities decreased by temperature. The increment of CO2 permeability with temperature was less than that of CH4 and N2
  9. Keywords:
  10. Gases Separation ; Carbon Dioxide Absorption ; Mixed-Matrix Membrane ; Zeolite SAPO-34

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