Department of Applied Chemistry, School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P.R. China.
Bernal Institute and Department of Chemical Sciences, University of Limerick, Limerick V94 T9PX, Republic of Ireland.
Science. 2019 Oct 11;366(6462):241-246. doi: 10.1126/science.aax8666.
Purification of ethylene (CH), the largest-volume product of the chemical industry, currently involves energy-intensive processes such as chemisorption (CO removal), catalytic hydrogenation (CH conversion), and cryogenic distillation (CH separation). Although advanced physisorbent or membrane separation could lower the energy input, one-step removal of multiple impurities, especially trace impurities, has not been feasible. We introduce a synergistic sorbent separation method for the one-step production of polymer-grade CH from ternary (CH/CH/CH) or quaternary (CO/CH/CH/CH) gas mixtures with a series of physisorbents in a packed-bed geometry. We synthesized ultraselective microporous metal-organic materials that were readily regenerated, including one that was selective for CH over CO, CH, and CH.
目前，化学工业中产量最大的乙烯（CH）的纯化过程涉及到能源密集型的工艺，如化学吸附（去除 CO）、催化氢化（CH 转化）和低温蒸馏（CH 分离）。尽管先进的物理吸附剂或膜分离可以降低能源投入，但一步去除多种杂质，特别是痕量杂质，仍然难以实现。我们介绍了一种协同吸附剂分离方法，用于从三元（CH/CH/CH）或四元（CO/CH/CH/CH）气体混合物中一步生产聚合物级 CH，该方法采用填充床几何形状的一系列物理吸附剂。我们合成了易于再生的超选择性微孔金属有机材料，包括一种对 CH 相对于 CO、CH 和 CH 具有选择性的材料。
