A Scalable Ultramicroporous Coordination Network for Ethylene Separation from the Quaternary Mixture.

Adsorptive ethylene separation from the C 2 H 2 /C 2 H 4 /C 2 H 6 /CO 2 four-component gas mixture provides a low-energy input solution for industrial ethylene purification, yet it is still a great challenge. Herein, we report a facile scaled-up synthesis of a stable ultramicroporous coordination network of Zn-CO 3 -datz (Hdatz = 3,5-diamine-1,2,4-triazole), which enables selective adsorption of C 2 H 2 , C 2 H 4 and CO 2 over C 2 H 4 , thanks to its specific pore environment supported by GCMC simulation of gas adsorption sites. Dynamic breakthrough experiments exhibited efficient one-step production of polymer-grade (≥99.95%) C 2 H 4 from the quaternary C 2 H 4 /C 2 H 2 /C 2 H 6 /CO 2 (1/1/1/1) mixture, with excellent C 2 H 4 productivity of 0.12 mol kg -1 at 298 K. Moreover, it can be easily synthesized in kilogram scale with an affordable and low-cost ligand, rendering its further potential industrial applications.