Ethylene (C2H4) is extremely important as one of the world's largest chemical commodity. A variety of light hydrocarbon gases (C1-C3) and carbon dioxide (CO2) coexist with C2H4 in the production, which need to be removed to produce polymer grade C2H4. Conventional thermal-driven distillation separation processes consume large amounts of energy, which has prompted the creation of energy-efficient adsorption separation techniques that utilize physical adsorbents. Metal-organic frameworks (MOFs) have great potential in the separation and purification of ethylene due to their vast surface area, large porosity and highly customizable pores. The purification of C2H4 from multi-component mixtures is more related to the real hydrocarbon industry than the extensively studied separation of ideal binary mixtures, but more challenging for the design of desirable MOFs. To date, there is a noticeable absence of a comprehensive discussion of advancements in the separation of ethylene from multi-component mixtures using MOF adsorbents. This review offers a detailed overview of the ongoing developments in the creation of MOFs for multi-component C2H4 purification applications, which include the purification of C2H4 from ternary, quaternary, quinary, senary, septenary and octary hydrocarbon mixtures. Ternary-component separations include C2H2/C2H4/C2H6 separation and C2H2/CO2/C2H4 separation while quaternar-component separations include C2H2/C2H4/CO2/C2H6 separation and C2H2/C2H4/C3H4/1-C4H6 separation. Particularly, the merits and innovations of MOFs in the single-step purification of C2H4 from complex mixtures will be examined. This includes insights into the mechanisms of separation and the overarching tactics devised to enhance the performance of the separation process. Moreover, this review will outline the possible hurdles faced when shifting MOFs from the domain of scholarly inquiry to practical industrial application, and to encapsulate the outlook for this swiftly progressing area of study.

中文翻译：

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用于从多组分烃类混合物中一步法纯化乙烯的金属-有机框架


乙烯 （C2H4） 是世界上最大的化学商品之一，极为重要。在生产过程中，各种轻烃气体 （C1-C3） 和二氧化碳 （CO2） 与 C2H4 共存，需要将其去除以生产聚合物级 C2H4。传统的热驱动蒸馏分离工艺消耗大量能源，这促使创造了利用物理吸附剂的节能吸附分离技术。金属有机框架 （MOF） 具有较大的表面积、较大的孔隙率和高度可定制的孔隙，因此在乙烯的分离和纯化方面具有巨大潜力。与广泛研究的理想二元混合物分离相比，从多组分混合物中纯化 C2H4 与真正的碳氢化合物工业更相关，但对于设计所需的 MOF 更具挑战性。迄今为止，明显缺乏对使用 MOF 吸附剂从多组分混合物中分离乙烯的进展的全面讨论。本文详细概述了用于多组分 C2H4 纯化应用的 MOF 制备的持续发展，包括从三元、四元、五元、四元、七元和八元烃混合物中纯化 C2H4。三元组分分离包括 C2H2/C2H4/C2H6 分离和 C2H2/CO2/C2H4 分离，而四元组分分离包括 C2H2/C2H4/CO2/C2H6 分离和 C2H2/C2H4/C3H4/1-C4H6 分离。特别是，将研究 MOF 在从复杂混合物中一步纯化 C2H4 的优点和创新。这包括对分离机制的见解以及为提高分离过程的性能而设计的总体策略。 此外，本文将概述将 MOF 从学术研究领域转向实际工业应用时可能面临的障碍，并概括这一快速发展的研究领域的前景。