Functionally gradient covalent organic framework membrane as well as preparation and application

A covalent organic framework, functional gradient technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of affecting membrane stability, easy formation of defects, poor interface interaction, etc., and achieve good operational stability. The effect of stability, high selectivity and good interface compatibility

Active Publication Date: 2018-05-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interface between polymers and inorganic particles is poor, and defects are easy to form, which affects the stability of the film.

Method used

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  • Functionally gradient covalent organic framework membrane as well as preparation and application
  • Functionally gradient covalent organic framework membrane as well as preparation and application
  • Functionally gradient covalent organic framework membrane as well as preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, the preparation of a functionally graded covalent organic framework composite membrane, the steps are as follows:

[0021] Step 1) Preparation of covalent organic framework TpHZ: Dissolve 0.18g of 1,3,5-triformylpyroglucinol in 30mL of 1,3,5-trimethylbenzene / ethanol (v:v=1:1) solvent, Then 0.27 g of hydrazine hydrate was added. The system was sealed and heated to 120°C in a nitrogen atmosphere, and reacted for 48 hours to obtain a reddish-brown precipitate. The product was successively washed with anhydrous tetrahydrofuran, anhydrous acetone and anhydrous dichloromethane by centrifugation, and then vacuum-dried at 120° C. for 24 hours to obtain a red powder. Place the dried product in a mortar, add 3-5 drops of methanol and grind for 60 min. The ground product was dissolved in methanol, washed by centrifugation, and vacuum-dried at 40°C for 24 hours to obtain the final covalent organic framework TpHZ, which had a lateral dimension of 200 nm, a sheet thic...

Embodiment 2

[0023] Embodiment 2, the preparation of a functionally graded covalent organic framework composite membrane, the steps are as follows:

[0024] Step 1) Preparation of covalent organic framework TpHZ: Dissolve 0.24 g of 1,3,5-triformylpyroglucinol in 30 mL of 1,3,5-trimethylbenzene / ethanol (v:v=1:1) solvent, Then 0.36 g of hydrazine hydrate was added. The system was sealed and heated to 120°C in a nitrogen atmosphere, and reacted for 48 hours to obtain a reddish-brown precipitate. The product was successively washed with anhydrous tetrahydrofuran, anhydrous acetone and anhydrous dichloromethane by centrifugation, and then vacuum-dried at 120° C. for 24 hours to obtain a red powder. Place the dried product in a mortar, add 3-5 drops of methanol and grind for 60 min. The ground product was dissolved in methanol, washed by centrifugation, and vacuum-dried at 40°C for 24 hours to obtain the final product covalent organic framework TpHZ, which had a lateral dimension of 250 nm, a ...

Embodiment 3

[0026] Example 3, the preparation of a functionally graded covalent organic framework composite membrane, the steps are as follows:

[0027]Step 1) Preparation of covalent organic framework TpHZ: Dissolve 0.3g of 1,3,5-triformylpyroglucinol in 30mL of 1,3,5-trimethylbenzene / ethanol (v:v=1:1) solvent, Then 0.45 g of hydrazine hydrate was added. The system was sealed and heated to 120°C in a nitrogen atmosphere, and reacted for 48 hours to obtain a reddish-brown precipitate. The product was successively washed with anhydrous tetrahydrofuran, anhydrous acetone and anhydrous dichloromethane by centrifugation, and then vacuum-dried at 120° C. for 24 hours to obtain a red powder. Place the dried product in a mortar, add 3-5 drops of methanol and grind for 60 min. The ground product was dissolved in methanol, washed by centrifugation, and dried in vacuum at 40°C for 24 hours to obtain the final product TpHZ, which had a lateral dimension of 320 nm, a sheet thickness of 5.5 nm, and ...

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Abstract

The invention discloses a functionally gradient covalent organic framework membrane. The functionally gradient covalent organic framework membrane is prepared from polyethersulfone and a covalent organic framework. Preparation steps comprise the following steps: taking 1,3,5-triformylphloroglucinol and hydrazine hydrate as monomers; carrying out condensation polymerization reaction in 1,3,5-trimethylbenzene and an ethanol solvent; washing a product through tetrahydrofuran, acetone and dichloromethane in sequence; then carrying out wet-phase grinding to obtain the covalent organic framework TpHZ; dispersing the covalent organic framework TpHZ into N,N-dimethylformamide and mixing with the polyethersulfone to form a membrane casting solution; adding a certain amount of the volatile solvent tetrahydrofuran; carrying out steps including scraping, non-solvent induced phase separation, surface segregation, immersion, drying and the like on the membrane casting solution to obtain the functionally gradient covalent organic framework membrane. The functionally gradient covalent organic framework membrane has the advantages of simple and convenient preparation process, strong controllability, easiness for obtaining the raw materials and common method. The prepared membrane is used for realizing pervaporization of an ethanol-water solution system and has high permeation flux and high selectivity on water molecules; the composite membrane has good operation stability at high temperature.

Description

technical field [0001] The invention relates to a functional gradient covalent organic framework membrane and its preparation and application, belonging to the technical field of functional gradient membranes. Background technique [0002] Fuel ethanol is considered to be the next generation of biofuel, which has the advantages of high octane number, good anti-knock performance, and environmental protection. At present, industrial production can obtain ethanol aqueous solution through fermentation in biomass. In the process of producing fuel ethanol, the dehydration stage is aimed at the azeotrope of ethanol and water, which consumes a lot of energy (accounting for about 20% of the total energy consumption) and is difficult to separate. The commonly used dehydration methods are special distillation and adsorption. The special distillation process is complex and consumes a lot of energy. Although the process of adsorption is relatively simple, it is a batch operation. Compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D67/00B01D61/36C10L1/02
CPCB01D61/36B01D67/0002B01D71/06C10L1/02
Inventor 吴洪姜忠义杨昊徐子昂张晗潘福生程暄暄刘冠华穆博文
Owner TIANJIN UNIV
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