With rapid societal development, there has been a significant increase in the demand for chemicals. Ethylene, as the most widely used basic chemical, is now subject to increasingly stringent quality and purity standards. The separation and purification of ethylene from C2 hydrocarbons covalent organic frameworks (COFs) are a fascinating and challenging area of research. Compared with conventional separation techniques, COFs have demonstrated the capacity to efficiently separate and purify analogues while simultaneously reducing energy consumption. As a result, it is urgent to conduct a study on COF applications in separating and purifying ethylene from C2 hydrocarbons to foster greater advancement in this field. This review provides an overview of research on ethylene separation, discusses the results and effective strategies reported for the use of COFs in ethylene separation to date, and presents challenges encountered in the current development process. The aim of this review is to inspire the design of COFs for ethylene separation and facilitate further development in this emerging field.
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