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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Adsorption Science

Background:

  • Efficient separation of propyne from propylene is essential for producing polymer-grade propylene.
  • Current separation methods face challenges, and covalent organic frameworks (COFs) have not yet been successfully applied.
  • Achieving high-purity propylene (>99.99%) requires advanced separation techniques.

Purpose of the Study:

  • To synthesize novel three-dimensional covalent organic frameworks (COFs) for propyne/propylene separation.
  • To characterize the structural and adsorption properties of the synthesized COFs.
  • To evaluate the efficiency of these COFs in removing propyne from propylene mixtures.

Main Methods:

  • Synthesis of two 3D COFs using an [8+4] construction approach with an octatopic aldehyde monomer.
  • Structure determination using continuous rotation electron diffraction and structural simulation.
  • Characterization of COF properties including crystallinity, porosity, and stability.
  • Validation of separation performance through dynamic breakthrough experiments.

Main Results:

  • Two novel 3D COFs with a rare flu topology were successfully synthesized.
  • The COFs demonstrated high crystallinity, high porosity, and good chemical stability.
  • Efficient removal of trace propyne from propyne/propylene mixtures was achieved, yielding high-purity propylene (>99.99%).
  • The interconnected micropores and nonpolar pore environment of the COFs are key to their separation performance.

Conclusions:

  • The developed COFs represent a significant advancement in propyne/propylene separation technology.
  • These COFs offer a highly efficient and viable adsorbent solution for industrial applications.
  • This research opens new possibilities for utilizing COFs in challenging gas separation processes.