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A novel adsorbent, FJI-W88, effectively removes acetylene (C2H2) from ethylene (C2H4) mixtures. This breakthrough enables highly pure ethylene production, even under challenging industrial conditions.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Ethylene purification is critical for industrial applications.
  • Separating trace acetylene from ethylene is a significant challenge.
  • Existing methods often lack efficiency and selectivity.

Purpose of the Study:

  • To develop a robust adsorbent for selective acetylene removal from ethylene.
  • To achieve high acetylene adsorption capacity and ethylene/acetylene separation selectivity.
  • To demonstrate the adsorbent's performance in industrial-relevant conditions.

Main Methods:

  • Synthesis of a novel adsorbent, FJI-W88, incorporating SiF62-.
  • Characterization of FJI-W88's adsorption properties using acetylene/ethylene mixtures.
  • Evaluation of selectivity using Ideal Adsorbed Solution Theory (IAST).
  • Column breakthrough experiments to assess purification efficiency.

Main Results:

  • FJI-W88 exhibits ultrahigh acetylene uptake (2.80 mmol g-1 at 0.01 bar).
  • Exceptional acetylene/ethylene selectivity (IAST selectivity of 698 for a 1/99 mixture).
  • Achieved high purity ethylene (≥99.95%) with high yield (230.0 mol kg-1).
  • Stable performance under high temperature and humidity.

Conclusions:

  • FJI-W88 is a highly effective adsorbent for acetylene removal from ethylene.
  • The adsorbent demonstrates excellent selectivity and capacity for efficient ethylene purification.
  • FJI-W88 shows robustness for practical industrial applications.