Efficient C₂H₆/C₂H₄ adsorption separation by a microporous heterometal-organic framework

Area of Science:

• Materials Science
• Chemical Engineering
• Petrochemical Industry

Background:

• Ethylene (C2H4) purification is crucial for the petrochemical industry but is energy-intensive.
• Adsorption using selective porous materials is an efficient separation method.
• Designing effective ethane (C2H6)-selective adsorbents remains a significant challenge.

Purpose of the Study:

• To develop and evaluate a novel heterometal-organic framework for ethane/ethylene separation.
• To demonstrate the C2H6-preferential adsorption capabilities of the new material.
• To assess the material's performance for producing polymer-grade ethylene.

Main Methods:

• Synthesis and characterization of a microporous heterometal-organic framework, CuIn(ina)4.
• Adsorption experiments to evaluate C2H6/C2H4 mixture separation performance.
• Theoretical calculations and breakthrough experiments to validate adsorption behavior.

Main Results:

• CuIn(ina)4 exhibits preferential enrichment of ethane (C2H6) over ethylene (C2H4).
• The material shows high C2H6 loading capacity (3.3 mmol/g) and IAST selectivity (2.3).
• Remarkable separation potential (1578 mmol/L) achieved for equimolar C2H6/C2H4 mixtures under ambient conditions.

Conclusions:

• CuIn(ina)4 is a highly effective C2H6-selective adsorbent for C2H6/C2H4 separation.
• The developed material offers a promising alternative for energy-efficient ethylene purification.
• This work advances the design of advanced porous materials for industrial gas separations.