An iron-based double-ligand metal-organic framework material that preferentially adsorbs ethane and its preparation method and application

Abstract

The invention discloses an iron-based double-ligand metal organic framework material capable of preferentially adsorbing ethane as well as a preparation method and application of the iron-based double-ligand metal organic framework material. The method comprises the following steps: (1) dropping a sodium acetate solution into an iron nitrate solution, and carrying out stirring to obtain an iron cluster; and (2) dissolving terephthalic acid and triethylene diamine into N,N-dimethylformamide, then, dropping a DMF solution of the iron cluster, then, dropwise adding glacial acetic acid, and carrying out uniform stirring; and placing a mixed solution into a glass bottle to be sealed, then, carrying out a programmed temperature controlled solvothermal synthesis reaction to obtain the iron-baseddouble-ligand metal organic framework material. The material has the property of preferentially adsorbing ethane, both the ethane adsorption capacity and ethane / ethylene adsorption selectivity are onthe international advanced level, the ethane adsorption capacity of the material is more than 2.5 times as high as that of activated carbon under the same condition, the ethane / ethylene adsorption selectivity is more than 2 times as high as that of activated carbon, and the water vapor stability is good. The material has a good application prospect for industrial ethylene and ethane separation.

Description

technical field

[0001] The invention relates to the technical field of adsorption and separation of ethylene and ethane, in particular to an iron-based double-ligand metal-organic framework material that preferentially adsorbs ethane, a preparation method and application thereof. Background technique

[0002] Ethylene is an important petrochemical raw material widely used in the preparation of polystyrene, polyethylene, polyester and other chemicals. Industrial ethylene is mostly derived from the cracking of petroleum and the thermal cracking of ethane. When ethylene is produced by thermal cracking, ethane is inevitably produced as a by-product. Separation of ethylene from ethane and ethylene mixtures is extremely challenging due to their similar boiling points and molecular sizes. The traditional industrial separation technology of ethylene and ethane generally adopts the cryogenic separation method, which needs to be operated at low temperature (-25°C) and high pressure (...

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