Experimental study demonstrates enhanced 1,3-butadiene separation in C4 olefin mixtures, indicating an energy-efficient approach for rubber monomer purification.
Key Points
Design a dinitrogen-containing heterocyclic porous liquid to selectively separate 1,3-butadiene from challenging C4 olefin mixtures.
Synthesized a porous liquid by combining a manganese-based metal-organic framework (Mn-bpdc) as a porous host with a dual-imidazole deep eutectic solvent (2EmimCl:CH3-Im) as a steric hindrance solvent.
Measured 1,3-butadiene/1-butene separation selectivity at 5 wt% MOF loading and evaluated performance across five recycling cycles.
Performed quantum calculations to evaluate the role of hydrogen bonding, π–π interactions, dispersion, and electrostatic forces in driving molecular adsorption.
Incorporation of 5 wt% Mn-bpdc increased 1,3-butadiene/1-butene selectivity from 9.20 to 17.21.
Maintained stable selective separation performance across five consecutive operational cycles.
Computational modeling confirmed that the one-dimensional channels facilitate gate opening and size exclusion, while dual imidazole rings and chloride ions synergistically strengthen butadiene affinity.