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Super-hydrophobic hollow MOFs modified hollow fiber composite membrane and application thereof

A fiber composite and super-hydrophobic technology, applied in fiber treatment, synthetic fiber, membrane technology, etc., can solve the problems of low microporosity and poor hydrophobicity, and achieve the goal of improving hydrophobicity, improving microporosity and reducing mass transfer resistance Effect

Active Publication Date: 2022-05-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of low microporosity and poor hydrophobicity in existing hollow fiber membranes, the present invention provides a hollow fiber composite membrane modified by super-hydrophobic hollow MOFs and its application in alcohol / water rectification. Higher rectification efficiency of hydrophobic hollow MOFs modified hollow fiber composite membrane

Method used

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  • Super-hydrophobic hollow MOFs modified hollow fiber composite membrane and application thereof
  • Super-hydrophobic hollow MOFs modified hollow fiber composite membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of ZIF-8: Prepare 100mL ZnCl respectively 2 Methanol solution (1mol / L) and 2-methylimidazole (2mol / L) methanol solution, and then they were uniformly mixed under the condition of stirring, left to stand at room temperature for 24h, centrifugal methanol washing and drying, to obtain ZIF- 8 materials.

[0034] (2) Preparation of super-hydrophobic hollow ZIF-8: disperse the ZIF-8 material in 30mL water by ultrasonic stirring to obtain a 10mg / mL ZIF-8 dispersion, and then add 30mL 3mg / mL tea polyphenols aqueous solution, Stir for 5 minutes, then centrifuge, wash with methanol and hexane in turn, then redisperse it in 30mL of hexane, add 1mL (0.89g) of n-dodecyltrimethoxysilane, and stir the reaction at 80°C for 24h. Centrifuge, wash with hexane, and dry to obtain a super-hydrophobic hollow ZIF-8 material.

[0035] (3) Super-repellent hollow ZIF-8 modified hollow fiber composite membrane and components: PS polymer hollow fiber is used as the supporting memb...

Embodiment 2

[0039] (1) Preparation of ZIF-7: Prepare 100mL ZnCl respectively 2methanol solution (1mol / L) and benzimidazole (2mol / L) methanol solution, and then mix them uniformly under the condition of stirring, stand at room temperature for 24h, centrifuge methanol washing and drying to obtain ZIF-7 material .

[0040] (2) Preparation of super-hydrophobic hollow ZIF-7: disperse the ZIF-7 material in water by ultrasonic stirring to obtain a 10 mg / mL ZIF-7 dispersion, then add 30 mL of 3 mg / mL tea polyphenol aqueous solution, and stir 5min, then centrifuged, washed with methanol and hexane in turn, then dispersed in 30mL of hexane again, added 1mL (0.89g) n-dodecyltrimethoxysilane, stirred at 80°C for 24h, centrifuged Wash and dry with hexane to obtain super-hydrophobic hollow ZIF-7 material.

[0041] (3) Super-repellent hollow ZIF-7 modified hollow fiber composite membrane and components: PS polymer hollow fiber is used as the supporting membrane (molecular weight cut-off 60,000, Tianji...

Embodiment 3

[0044] (1) Preparation of ZIF-67: Prepare 100mL CoCl respectively 2 Methanol solution (1mol / L) and 2-methylimidazole (2mol / L) methanol solution, and then they were uniformly mixed under the condition of stirring, left to stand at room temperature for 24h, centrifugal methanol washing and drying, to obtain ZIF- 67 materials.

[0045] (2) Preparation of super-hydrophobic hollow ZIF-67: disperse the ZIF-67 material in water by ultrasonic stirring to obtain a 10mg / mL ZIF-67 dispersion, then add 30mL of 3mg / mL tea polyphenol aqueous solution and stir for 5min , then centrifuged, washed with methanol and hexane in turn, and then dispersed in 30mL of hexane again, after adding 1mL (0.89g) of n-dodecyltrimethoxysilane, stirred at 80°C for 24h, centrifuged The super-hydrophobic ZIF-67 material was obtained by washing and drying with alkane.

[0046] (3) Super-repellent hollow ZIF-67 modified hollow fiber composite membrane and components: PS polymer hollow fiber is used as the suppor...

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Abstract

The invention discloses a super-hydrophobic hollow MOFs modified hollow fiber composite membrane and application thereof in alcohol / water rectification. The preparation method comprises the following steps: etching MOFs by adopting polyphenol to form hollow MOFs with rich reaction sites, then carrying out super-hydrophobic modification on the hollow MOFs to obtain super-hydrophobic hollow MOFs, then introducing the super-hydrophobic hollow MOFs into a polydimethylsiloxane (PDMS) coating solution, and coating the inner side of a hollow fiber membrane component to obtain the super-hydrophobic hollow MOFs modified hollow fiber composite membrane. And carrying out alcohol / water rectification by taking the obtained product as a structured packing. The preparation method has the advantages that the prepared super-hydrophobic hollow MOFs modified hollow fiber composite membrane greatly reduces the mass transfer resistance under the condition of reducing the wettability of the membrane, and has a good market application prospect.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a super-repellent hollow MOFs modified hollow fiber composite membrane and its application in alcohol / water rectification. Background technique [0002] With the increasing shortage of non-renewable energy such as coal, oil, and natural gas, the world's economic development is facing a severe test. As a renewable energy source, fuel alcohol (ethanol, isopropanol, etc.) has gradually become a research hotspot. Most industries have high requirements on the purity of fuel alcohol, and it is easy to form azeotrope with water. However, in the application of alcohol / water separation, traditional azeotropic distillation, extractive distillation, etc. have high energy consumption and low separation efficiency. In view of this, the researchers proposed to use hollow fiber membranes as regular fillers for alcohol / water rectification. Compared with traditional rectification,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/12C08G83/00D06M15/37D06M15/643B01D61/36D06M101/18
CPCB01D69/08B01D69/12C08G83/008D06M15/37D06M15/643B01D61/364D06M2101/18Y02C20/40
Inventor 张国亮张旭孟琴
Owner ZHEJIANG UNIV OF TECH
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