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Preparation method of high dispersion metal-organic framework (MOF)/organic hybrid priority alcohol through composite membrane

A technology that gives priority to alcohol penetration and organic hybridization, applied in the field of membrane separation, can solve problems such as MOF particle agglomeration, and achieve the effect of improving alcohol penetration performance

Active Publication Date: 2014-08-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The primary purpose of the present invention is to solve the MOF particle agglomeration problem that occurs during the film-forming process of MOF / organic hybrid films, and to directly blend undried MOF grains with organic polymers to prepare uniform hybrid films, and to provide a A method for preparing a MOF / organic hybrid preferentially permeable composite membrane with high loading and uniform dispersion, further improving the separation performance of the permeable membrane

Method used

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  • Preparation method of high dispersion metal-organic framework (MOF)/organic hybrid priority alcohol through composite membrane
  • Preparation method of high dispersion metal-organic framework (MOF)/organic hybrid priority alcohol through composite membrane
  • Preparation method of high dispersion metal-organic framework (MOF)/organic hybrid priority alcohol through composite membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The base membrane is made of polysulfone (PS) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​26.4cm 2 , the high molecular polymer used is PDMS (viscosity is 20000Pa·s), and the solvent is n-heptane.

[0030] Preparation method and steps:

[0031] 1) Clean the synthesized ZIF-8 grains, filter and disperse them in 10mL ethanol without drying to form a stable ZIF-8 / ethanol emulsion;

[0032] 2) Dissolve 1wt.% PDMS in 250mL n-heptane, stir for 1h and then add dropwise the ZIF-8 / ethanol emulsion in step 1), the ratio of ZIF-8 amount (ZIF-8 emulsion dry weight) to PDMS is 0.5 : 1 (w / w), ultrasound for 30min to make it fully mixed evenly, then add 1% ethyl orthosilicate and 0.05% dibutyltin dilaurate, continue to stir for 0.5h, and prepare ZIF-8 / PDMS film solution A: Dissolve 10wt.% PDMS in 250mL n-heptane, stir for 1.5h, add tetraethyl orthosilicate with a mass concentration of 1% and 0.05% dibutyltin dilaurate...

Embodiment 2

[0040] The base membrane is made of polysulfone (PS) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​26.4cm 2 , the high molecular polymer used is PDMS (viscosity is 20000Pa·s), and the solvent is n-heptane.

[0041] Preparation method and steps:

[0042] 1) The synthesized ZIF-8 grains were cleaned, and then dispersed in 10 mL of ethanol without drying to form a stable ZIF-8 / ethanol emulsion;

[0043] 2) Dissolve 1wt.% PDMS in 250mL n-heptane, stir for 1h and then add dropwise the ZIF-8 / ethanol emulsion in step 1), the ratio of ZIF-8 amount (ZIF-8 emulsion dry weight) to PDMS is 1 : 1 (w / w), ultrasound for 30min to make it fully mixed evenly, then add 1% ethyl orthosilicate and 0.05% dibutyltin dilaurate, continue to stir for 0.5h, and prepare ZIF-8 / PDMS film solution A: Dissolve 10wt.% PDMS in 250mL n-heptane, stir for 1.5h, add tetraethyl orthosilicate with a mass concentration of 1% and 0.05% dibutyltin dilaur...

Embodiment 3

[0082] The base membrane is made of polysulfone (PS) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​26.4cm 2 , the high molecular polymer used is PDMS (viscosity is 20000Pa·s), and the solvent is n-heptane.

[0083] Preparation method and steps:

[0084] 1) The synthesized ZIF-8 grains were cleaned, and then dispersed in 10 mL of ethanol without drying to form a stable ZIF-8 / ethanol emulsion;

[0085] 2) Dissolve 2wt.% PDMS in 250mL n-heptane, stir for 1h and then add dropwise the ZIF-8 / ethanol emulsion in step 1), the ratio of ZIF-8 amount (ZIF-8 emulsion dry weight) to PDMS is 1 : 1 (w / w), ultrasound for 30min to make it fully mixed evenly, then add 1% ethyl orthosilicate and 0.05% dibutyltin dilaurate, continue to stir for 0.5h, and prepare ZIF-8 / PDMS film solution A: Dissolve 10wt.% PDMS in 250mL n-heptane, stir for 1.5h, add tetraethyl orthosilicate with a mass concentration of 1% and 0.05% dibutyltin dilaur...

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Abstract

The invention relates to a preparation method of a high dispersion metal-organic framework (MOF) / organic hybrid priority alcohol through composite membrane, belonging to the technical field of membrane separation. The method comprises the steps of cleaning MOF crystal particles, and dispersing the cleaned crystal particles into a polar solvent without drying to form stable MOF emulsion; dissolving 0.5-5wt% of high-molecular polymer into a solvent, feeding the MOF emulsion, and then feeding a cross-linking agent and a catalyst to prepare membrane liquid A; dissolving 8-20wt% of high-molecular polymer into the solvent, and feeding the cross-linking agent and the catalyst to prepare membrane liquid B; dipping a base membrane into the membrane liquid A, taking out the base membrane and drying; dipping the surface of the base membrane for a plurality of times to obtain a nascent state MOF / high-molecular polymer hybrid separation layer; after that, dipping the base membrane into the membrane liquid B, taking out the base membrane and drying; putting into a vacuum oven to enable the high-molecular polymer to be completely cross-linked on the surface of the base membrane. The prepared hybrid composite membrane has excellent alcohol through performance and potential application value.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a highly dispersed MOF / organic hybrid pervaporation preferential alcohol permeation composite membrane. Background technique [0002] With the increasingly serious environmental pollution and the increasing scarcity of petroleum resources, biofuels (bio-ethanol, bio-butanol), as a green, efficient and renewable new energy source, have been highly valued by countries all over the world. However, due to product inhibition, the traditional fermentation process only obtains dilute ethanol and butanol solutions with extremely low concentrations, which need to be removed from the fermentation broth in time. Pervaporation is a new type of membrane separation technology, which has the advantages of high efficiency, energy saving, and environmental protection. Using the coupling technology of alcohol-preferential pervaporation membrane and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/68B01D71/02B01D61/36
Inventor 张国俊范红玮王乃鑫纪树兰闫浩
Owner BEIJING UNIV OF TECH
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