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<p>Considering the extensive use of propylene (C<sub>3</sub>H<sub>6</sub>) as a feedstock in the chemical industry, the separation of propylene from propane (C<sub>3</sub>H<sub>8</sub>) is a critical process. Membrane technology has attracted significant attention due to its lower cost and higher efficiency compared to other methods for C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> separation. Mixed matrix membranes (MMMs) were fabricated by blending polyetherimide (PEI) with polyethyleneglycol-400 (PEG-400) and incorporating ZIF-67 via solvent evaporation method. ZIF-67 was selected over other ZIFs due to its suitable aperture size, Co<sup>2+</sup>-induced C<sub>3</sub>H<sub>6</sub> affinity, and superior stability and polymer compatibility. The resulting membranes demonstrated improved performance, addressing the conventional trade-off between permeability and selectivity in polymeric gas separation membranes. The gas permeation of C<sub>3</sub>H<sub>6</sub> and C<sub>3</sub>H<sub>8</sub> through pure, PEI/PEG-400, and PEI/PEG-400/ZIF-67 membranes was evaluated at 30&#xa0;°C and pressures of 2, 6, and 10&#xa0;bar. At 2&#xa0;bar, the PEI/PEG-400 20 wt.% membrane exhibited the best performance, improved the C<sub>3</sub>H<sub>6</sub> permeability and C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> selectivity from 3.86 and 4.77 to 13.87 and 8.72, respectively. The MMMs was prepared based on the PEI/PEG-400 20 wt% blend membrane. Among the resulting membranes at 10&#xa0;bar of pressure, the MMM containing 15 wt% ZIF-67 exhibited the best performance, with propylene permeability increasing by 123%, from 15.07 to 33.68, and ideal selectivity improving by 51%, from 9.25 to 13.98, compared to the pure polyetherimide membrane. Studies on membrane plasticization under high-pressure conditions showed that plasticization occurred only in the blend membrane with 30 wt% PEG at 6 and 10&#xa0;bar, whereas the mixed matrix membranes remained resistant to this effect.</p>

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Tuning the C3H6/C3H8 Separation Performance of PEI/PEG Blend Membrane Through Incorporating the ZIF-67 Particles

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Fatemeh Nemati,
  • Reza Abedini,
  • Hossein Hassanzadeh

摘要

Considering the extensive use of propylene (C3H6) as a feedstock in the chemical industry, the separation of propylene from propane (C3H8) is a critical process. Membrane technology has attracted significant attention due to its lower cost and higher efficiency compared to other methods for C3H6/C3H8 separation. Mixed matrix membranes (MMMs) were fabricated by blending polyetherimide (PEI) with polyethyleneglycol-400 (PEG-400) and incorporating ZIF-67 via solvent evaporation method. ZIF-67 was selected over other ZIFs due to its suitable aperture size, Co2+-induced C3H6 affinity, and superior stability and polymer compatibility. The resulting membranes demonstrated improved performance, addressing the conventional trade-off between permeability and selectivity in polymeric gas separation membranes. The gas permeation of C3H6 and C3H8 through pure, PEI/PEG-400, and PEI/PEG-400/ZIF-67 membranes was evaluated at 30 °C and pressures of 2, 6, and 10 bar. At 2 bar, the PEI/PEG-400 20 wt.% membrane exhibited the best performance, improved the C3H6 permeability and C3H6/C3H8 selectivity from 3.86 and 4.77 to 13.87 and 8.72, respectively. The MMMs was prepared based on the PEI/PEG-400 20 wt% blend membrane. Among the resulting membranes at 10 bar of pressure, the MMM containing 15 wt% ZIF-67 exhibited the best performance, with propylene permeability increasing by 123%, from 15.07 to 33.68, and ideal selectivity improving by 51%, from 9.25 to 13.98, compared to the pure polyetherimide membrane. Studies on membrane plasticization under high-pressure conditions showed that plasticization occurred only in the blend membrane with 30 wt% PEG at 6 and 10 bar, whereas the mixed matrix membranes remained resistant to this effect.