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Mixed Matrix Membrane Preparation for Gas Separation

Rabiee, Hesamoddin | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46199 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Soltanieh, Mohammad; Mousavi, Abbas
  7. Abstract:
  8. This study has concentrated on preparation of mixed matrix membranes (MMMs) in order to improve the separation performance of the neat poly(amide-12-b-ethylene oxide)(Pebax1074) membrane. Pebax1074 and zeolite SAPO-34 were used to fabricate MMM for the first time. Micro-size SAPO-34 was added to polymer matrix up to 35wt% based on polymer weight; even though at this high loading percentage the prepared membranes were not stable enough to be tested for characterization and gas permeation. The obtained results showed more than 30% increment in CO2 permeability, along with slight growth and reduction in N2 and CH4 permeabilities, respectively for 30wt% zeolite content membranes. Permeability and selectivity of the fabricated membranes were studied at different temperatures (25, 35, 45, 55 and 65°C) and pressures (4, 8, 12, 16, 20 and 24 bar). Sorption properties of the prepared membranes also were measured at 35 °C and different pressure and the results showed increment in capacity of the membranes to dissolve the tested gases and higher solubility coefficients. Sorption data were modeled using Langmuir-Henry Equation and the results showed fairly reasonablr error between predicted and experimental data. Moreover, the MMMs were characterized by differential scanning calorimetry (DSC), scanning electron microscope (SEM) and tensile analysis in order to evaluate their thermal, morphological and mechanical properties, respectively. An excellent improvement in CO2/CH4 selectivity (more than 70%) and CO2/N2 selectivity (about 15%) was shown at 20wt% loading percentage of SAPO-34
  9. Keywords:
  10. Carbon Dioxide Absorption ; Mixed-Matrix Membrane ; Membrane Separation ; Gases Separation ; Polyether Block Amide (PEBAX)Copolymers ; Zeolite SAPO-34

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