Anion pillared metal organic framework material constructed by tetradentate ligand and application of anion pillared metal organic framework material

Abstract

The invention discloses an anion pillared metal organic framework material constructed by a tetradentate ligand and application of the anion pillared metal organic framework material, and belongs to the technical field of metal organic framework materials. The material comprises a three-dimensional structure formed by metal cations, organic ligands and inorganic fluorine-containing anions, the three-dimensional structure is composed of a plurality of two-dimensional net structures and a plurality of inorganic fluorine-containing anions, wherein the plurality of two-dimensional net structures are sequentially laminated, and the plurality of inorganic fluorine-containing anions are linked between the adjacent two-dimensional net structures; each two-dimensional network structure is formed by a plurality of metal cations and four organic ligands coordinated on each metal cation, and every two of the four organic ligands are linked through a bond. According to the invention, a tetradentate pyridyl organic ligand with strong aromatic property and an AF62-or NbOF52-anion column with strong polarity are self-assembled and positioned with different metal nodes to form a 3D metal organic framework (MOF) material with a one-dimensional pore channel.

Description

technical field [0001] The invention belongs to the technical field of metal-organic framework materials, and in particular relates to an anion-pillared metal-organic framework material constructed by a tetradentate ligand and an application thereof. Background technique [0002] Ethylene is known as the "mother of the petrochemical industry" and is one of the most produced chemicals in the world. Its downstream products, such as polyethylene, styrene, and styrene-butadiene rubber, are widely used in the fields of medicine, textiles, and machinery. 2020 China Ethylene (C 2 h 4 ) with an annual output of more than 33 million tons, but the supply is still in short supply and the degree of dependence on foreign countries is as high as 8%. At present, the production of ethylene in industry is mainly separated from the low-carbon hydrocarbon mixture of naphtha cracking, and acetylene (C) is inevitably entrained in the cracked gas. 2 h 2 ) and ethane (C 2 h 6 ) impurities. ...

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Problems solved by technology

[0003] However, C 2 h 4 The quadrupole moment and kinetic diameter of the molecule (1.5×10 -26 esu cm 2 and ) are in C 2 h 2 (7.2×10 -26 esu cm 2 and ) and C 2 h 6 (0.65×10 -26 esu cm 2 and ), therefore, the design synthesis grabs C in one step from the three-component C2 2 h 2 and C 2 h 6 Purified C 2 h 4 Adsorbent materials are also extremely challenging

At present, most of the reported materials can only achieve a single C2H2 / C2H4 Or two-component separation of C2H4 / C2H6

It can be seen that the existing similar low-carbon hydrocarbons usually use cryogenic separation. The disadvantage is that the separation conditions are harsh, requiring low temperature, high pressure, high plate number, high reflux ratio, large equipment investment, and high energy consumption.

The adsorbent materials used in the existing adsorption separation technology are usually only for the separation of two-component systems (such as acetylene or ethylene ethane), and cannot realize the one-step removal of acetylene ethane from the C2 three-component to obtain high-purity ethylene

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