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Efficient separation of ethylene from acetylene/ethylene mixtures by a flexible-robust metal–organic framework
- Li, Libo, Lin, Rui-Biao, Krishna, Rajamani, Wang, Xiaoqing, Li, Bin, Wu, Hui, Li, Jinping, Zhou, Wei, Chen, Banglin
- Journal of materials chemistry A 2017 v.5 no.36 pp. 18984-18988
- binding sites, coordination polymers, ethylene, neutrons
- During the production of polymer-grade ethylene, trace amounts of acetylene (about 1%) in the ethylene feed need to be reduced to 40 parts per million (ppm). We herein report a metal–organic framework (MOF) of flexible-robust nature for the efficient removal of acetylene from acetylene/ethylene mixture to meet such a challenging separation need. Neutron powder diffraction studies reveal that its 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.