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Entropic Separation of Styrene/Ethylbenzene Mixtures by Exploitation of Subtle Differences in Molecular Configurations in Ordered Crystalline Nanoporous Adsorbents

机译:通过在有序结晶纳米多孔吸附剂中的分子构型微妙差异的熵分离苯乙烯/乙苯混合物的熵分离

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摘要

The separation of styrene/ethylbenzene mixture is of great importance in the petrochemical industry. Current technology uses distillation; this separation is difficult because of the small, 9 K, difference in the boiling points. An alternative separation method uses selective adsorption in nanoporous materials such as zeolites and metal organic frameworks. Here we present a simulation screening study for the separation of styrene/ethylbenzene mixture by adsorptive means in nanoporous materials near pore saturation conditions. Under these conditions, different entropic mechanisms can dictate the separation process. Commensurate stacking has the best trade-off between selectivity and saturation capacity and offers a geometrical solution to the separation problem. MIL-47 has the right channel size and topology for styrene to exhibit commensurate stacking offering high capacity and selectivity for styrene over ethylbenzene. Out of all the screened structures, MIL-47 was found to be the best candidate for the separation of styrene/ethylbenzene mixture.
机译:苯乙烯/乙苯混合物的分离在石油化工行业中具有重要意义。目前的技术使用蒸馏;由于小,9 k,沸点的差异,这种分离是困难的。另一种分离方法使用纳米岩材料中的纳米多孔材料中选择性吸附和金属有机框架。在这里,我们提出了一种模拟筛选研究,用于通过在孔饱和条件附近的纳米多孔材料中通过吸附方法分离苯乙烯/乙苯混合物。在这些条件下,不同的熵机制可以决定分离过程。相称堆叠在选择性和饱和容量之间具有最佳权衡,并为分离问题提供几何解决方案。 MIL-47具有苯乙烯的右声道尺寸和拓扑,以表现出具有高容量和对乙苯的苯乙烯的高容量和选择性的相称堆叠。除了所有筛选的结构中,发现MIL-47是分离苯乙烯/乙苯混合物的最佳候选者。

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