Recent progress in adsorption and separation of xylene isomers
The separation and purification of xylene isomers is one of the important processes in the petrochemical industry.However,the structures and properties of xylene isomers are extremely close.Conventional distillation and cryogenic crystallization separation methods have high energy consumption and low production efficiency.Simulated moving bed chromatography is the primary technology for separating xylene isomers,but zeolites as the adsorbents are insufficient in terms of adsorption capacity and separation selectivity.Metal-organic frameworks and supramolecular materials possess advantages such as flexible assembly,structural diversity,and adjustable properties.They can achieve highly efficient discrimination and separation of xylene isomers through the construction of polar pore environment and fine-turning of the size and shape of pore channels.This review summarizes the research progress of metal-organic frameworks and supramolecular materials in the adsorption and separation of xylene isomers,discusses the intrinsic mechanisms of xylene isomers'separation from aspects including electrostatic interactions,size sieving,and shape sieving.It also summarizes the problems and limitations of metal-organic frameworks in the field of xylenes separation and provides a prospective on future development directions.
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