During the production of polymer-grade ethylene, trace amounts of acetylene (about 1%) in the ethylene feed needs to be reduced to 40 parts per million (ppm). We herein report a metal-organic framework (MOF) of flexible-robust nature for efficient removal of acetylene from acetylene/ethylene mixture to meet such a challening separation need. Neutron powder diffraction studies reveal that the specific binding sites and unique pore structure collectively enable this MOF (ELM-12) to efficiently and selectively adsorb acetylene over ethylene under ambient conditions, making it feasible for this challenging separation. The purity of obtained ethylene is over 99.999% as demonstrated by experimental breakthrough curves of 1/99 acetylene/ethylene mixture.
Citation: Journal of Materials Chemistry A
Pub Type: Journals
Gas separation, Porous material