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An iron-based metal-organic framework material with high adsorption selectivity for C6 isomers and its preparation method and application

A technology of isomers and iron-based metals, applied in the field of iron-based metal-organic framework materials and their preparation, can solve the problem of low selectivity of isomers, achieve strong hydrophobicity, good chemical stability, The effect of good adsorption selectivity

Active Publication Date: 2018-12-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reported by Zoey R. Herm et al. 2 (BDP) 3 for C 6 Adsorption separation of alkane isomers and discovery of Fe 2 (BDP) 3 for different C 6 The order of alkane adsorption selectivity is: n-hexane > 2-methylpentane > 3-methylpentane > 2,3-dimethylbutane ≈ 2,2-dimethylbutane, but there is an adsorption separation C 6 Problem with low isomer selectivity

Method used

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  • An iron-based metal-organic framework material with high adsorption selectivity for C6 isomers and its preparation method and application
  • An iron-based metal-organic framework material with high adsorption selectivity for C6 isomers and its preparation method and application
  • An iron-based metal-organic framework material with high adsorption selectivity for C6 isomers and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Synthesis of iron clusters: ① 25.4293g of anhydrous sodium acetate and 8.08g of Fe(NO 3 ) 3 9H 2 O was respectively dissolved in 50ml of water; ②The sodium acetate aqueous solution was dropped into the ferric nitrate aqueous solution drop by drop, and stirred for 8 hours to obtain a mixed solution; ③The mixed solution was suction-filtered to obtain a brown solid, and the product was washed with deionized water and ethanol in sequence , the product was dried in a vacuum oven at 70°C for 7 hours at a constant temperature to obtain iron clusters [Fe 3 (CH 3 COO) 6 ].

[0042] (2) Synthesis of Fe-hifpbb: ①Dissolve 450mg ligand 2,2-bis(4-carboxyphenyl)hexafluoropropane and 450mg iron cluster in 30ml (28.44g) N,N-dimethylformamide (DMF); ②Add the DMF solution of 2,2-bis(4-carboxyphenyl)hexafluoropropane dropwise into the DMF solution of iron clusters, then add 5.0ml (5.25g) glacial acetic acid dropwise, and stir 30 min until the mixture is uniform; ③Put the mixture ...

Embodiment 2

[0044] (1) Synthesis of iron clusters: ① 32.32g of anhydrous sodium acetate and 8.08g of Fe(NO 3 ) 3 9H 2 O was respectively dissolved in 50ml of water; ②The sodium acetate aqueous solution was dropped into the ferric nitrate aqueous solution drop by drop, and stirred for 24 hours to obtain a mixed solution; ③The mixed solution was suction-filtered to obtain a brown solid, and the product was washed with deionized water and ethanol in turn , the product was dried in a vacuum oven at 70°C for 7 hours at a constant temperature to obtain iron clusters [Fe 3 (CH 3 COO) 6 ].

[0045] (2) Synthesis of Fe-hifpbb: ①Dissolve 450mg of ligand 2,2-bis(4-carboxyphenyl)hexafluoropropane and 900mg of iron clusters in 35.6ml (33.75g)N,N-dimethylformaldehyde amide (DMF); ②Add the DMF solution of 2,2-bis(4-carboxyphenyl)hexafluoropropane dropwise into the DMF solution of iron clusters, then add 8.57ml (9.0g) glacial acetic acid dropwise, and Stir for 30 minutes until the mixture is unifor...

Embodiment 3

[0047] (1) Synthesis of iron clusters: ① 28.87g of anhydrous sodium acetate and 8.08g of Fe(NO 3 ) 3 9H 2 O was respectively dissolved in 50ml of water; ②The sodium acetate aqueous solution was dropped into the ferric nitrate aqueous solution drop by drop, and stirred for 16 hours to obtain a mixed solution; ③The mixed solution was suction-filtered to obtain a brown solid, and the product was washed with deionized water and ethanol in turn , the product was dried in a vacuum oven at 70°C for 7 hours at a constant temperature to obtain iron clusters [Fe 3 (CH 3 COO) 6 ].

[0048] (2) Synthesis of Fe-hifpbb: ① Dissolve 450mg of the ligand 2,2-bis(4-carboxyphenyl)hexafluoropropane and 675mg of iron clusters in 32.8ml (31.1g) of N,N-dimethylformaldehyde amide (DMF); ②Add the DMF solution of 2,2-bis(4-carboxyphenyl)hexafluoropropane dropwise into the DMF solution of iron clusters, then add 6.785ml (7.125g) of glacial acetic acid dropwise, and Stir for 30 minutes until the mix...

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Abstract

The invention discloses an iron-base metal organic framework material with high adsorptive selectivity on C6 isomers, and a preparation method and application thereof. The method comprises the following steps: (1) respectively dissolving 2,2-bis-(4-carboxyphenyl)-hexafluoropropane and iron clusters in DMF; (2) dropwise adding the DMF solution of 2,2-bis-(4-carboxyphenyl)-hexafluoropropane into the DMF solution of iron clusters, dropwise adding glacial acetic acid and carrying out stirring; (3) carrying out filling into a stainless steel high-pressure reaction kettle, and carrying out temperature programmed control hydrothermal synthesis reaction; and (4) carrying out washing, centrifuging and drying to obtain the iron-base metal organic framework material. The iron-base metal organic framework material has high adsorptive selectivity on C6 alkane isomers, and under same conditions, the adsorptive selectivity of the material on normal hexane is more than 3 times higher than the adsorptive selectivity of 5A molecular sieves and other traditional adsorbents, and the material also has good chemical stability and hydrophobicity. The material can separate C6 isomers from straight run gasoline and has good potential application prospects.

Description

technical field [0001] The present invention relates to C 6 The technical field of adsorption and separation of alkane isomers, in particular to an iron-based metal-organic framework material with high adsorption selectivity for C6 isomers and its preparation method and application. Background technique [0002] n-Hexane is one of the most widely used hydrocarbon solvents in industry, and it is also the most representative non-polar solvent. At present, n-hexane is generally obtained from straight-run gasoline by rectification separation. However, in these raw materials, there are components with a boiling point very close to n-hexane, such as isomers of n-hexane such as 3-methylpentane and 2,2-dimethylbutane, so the effective separation of n-hexane , 3-methylpentane and 2,2-dimethylbutane etc. C 6 Isomers have important application value and research significance. [0003] At present, domestic and foreign C 6 The separation techniques of alkane isomers mainly include o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30C07C7/12C07C9/16
CPCB01J20/226B01J2220/4806B01J2220/4812C07C7/12C07C9/16
Inventor 夏启斌吕道飞陈永伟石仁凤吴厚晓李忠
Owner SOUTH CHINA UNIV OF TECH