Advances in adsorbents for hexane isomers separation

doi:10.11949/0438-1157.20210073

Abstract

Abstract:

Efficient separation of hexane isomers is one of the key processes in petrochemical industry to produce high-octane gasoline. The chemical properties of hexane isomer molecules are inactive, with similar polarizabilities and boiling points, making separation extremely challenging. At present, the adsorptive separation technology based on 5A molecular sieve has been widely used in industry. However, the adsorption capacity of 5A molecular sieve is low, and it cannot discriminate between mono-branched and di-branched isomers, limiting the further increase of the octane number. The structural diversity and high design ability of new porous materials such as metal-organic frameworks (MOFs) enable them to accurately identify the minor differences in the shapes and properties of isomer molecules, showing great separation performance and application prospects. In this review, the focus was on the recent progress of MOFs in the adsorptive separation of hexane isomers. Additionally, the current challenges and perspective of MOFs for the separation of hexane isomers were discussed.

Key words: metal-organic frameworks, adsorptive separation, hexane isomers

摘要：

己烷异构体的高效分离是石化行业生产高辛烷值汽油的关键过程之一。己烷异构体分子的化学性质不活泼，极化率、沸点相近，分离极具挑战。目前，基于5A分子筛的吸附分离技术在工业上得到了广泛应用，但5A分子筛的吸附容量较低，且无法实现单支链异构体与双支链异构体的选择性分离，限制了汽油辛烷值的进一步提高。金属-有机框架材料等新型多孔材料的结构多样性和高度可设计性使其可以精准识别异构体分子在形状和性质上的微小差异，展现出良好的分离性能和应用前景。重点综述了金属-有机框架材料在己烷异构体分离中的研究进展，归纳了分离机理和影响因素，并对该领域中存在的问题和未来发展方向进行了探讨。

关键词: 金属有机框架材料, 吸附分离, 己烷异构体

CLC Number:

TB 34

HAN Xiao,CHEN Yuting,SU Baogen,BAO Zongbi,ZHANG Zhiguo,YANG Yiwen,REN Qilong,YANG Qiwei. Advances in adsorbents for hexane isomers separation[J]. CIESC Journal, 2021, 72(7): 3445-3465.

韩笑,陈雨亭,苏宝根,鲍宗必,张治国,杨亦文,任其龙,杨启炜. 己烷异构体吸附分离材料研究进展[J]. 化工学报, 2021, 72(7): 3445-3465.

Figures/Tables 2

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