Department of Chemistry and Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, NJ, 08854, USA.
Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, Xili, Nanshan, Shenzhen, 518055, China.
Adv Mater. 2018 Dec;30(49):e1805088. doi: 10.1002/adma.201805088. Epub 2018 Oct 15.
Adsorptive separation of olefin/paraffin mixtures by porous solids can greatly reduce the energy consumption associated with the currently employed cryogenic distillation technique. Here, the complete separation of propane and propylene by a designer microporous metal-organic framework material is reported. The compound, Y (OH) (abtc) (H O) (DMA) (Y-abtc, abtc = 3,3',5,5'-azobenzene-tetracarboxylates; DMA = dimethylammonium), is rationally designed through topology-guided replacement of inorganic building units. Y-abtc is both thermally and hydrothermally robust, and possesses optimal pore window size for propane/propylene separation. It adsorbs propylene with fast kinetics under ambient temperature and pressure, but fully excludes propane, as a result of selective size exclusion. Multicomponent column breakthrough experiments confirm that polymer-grade propylene (99.5%) can be obtained by this process, demonstrating its true potential as an alternative sorbent for efficient separation of propane/propylene mixtures.
多孔固体对烯烃/烷烃混合物的吸附分离可以大大降低目前采用的低温蒸馏技术所消耗的能量。在这里，通过设计一种微孔金属有机骨架材料，实现了丙烷和丙烯的完全分离。该化合物为 Y(OH)(abtc)(H2O)(DMA)(Y-abtc，abtc=3,3',5,5'-偶氮苯四羧酸根；DMA=二甲基铵)，通过拓扑引导的无机构筑单元取代来进行合理设计。Y-abtc 具有热稳定性和水热稳定性，并且具有用于丙烷/丙烯分离的最佳孔窗尺寸。它在环境温度和压力下以快速动力学吸附丙烯，但由于选择性尺寸排除，完全排斥丙烷。多组分柱穿透实验证实，通过该工艺可以得到聚合级丙烯（99.5%），这证明了它作为高效分离丙烷/丙烯混合物的替代吸附剂的真正潜力。
