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MOFs (metal-organic frameworks)-cross-linked polyethylene glycol diacrylate mixed substrate membrane, preparation and application

A polyethylene glycol diacrylate, mixed matrix membrane technology, applied in membrane technology, carbon compound, semi-permeable membrane separation, etc. problems, to achieve the effect of improved permeability and separation selectivity, significant industrial application prospects, simple and easy operation conditions and synthesis process

Active Publication Date: 2017-05-10
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for traditional polymer membranes to meet high gas permeability and separation selectivity at the same time, that is, it is difficult to break through the upper limit of the Robeson curve.
Although dense inorganic membranes can obtain high permeation flux and high selectivity at the same time, inorganic materials are brittle, prone to defects, and expensive, which limits their wide industrial applications.

Method used

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  • MOFs (metal-organic frameworks)-cross-linked polyethylene glycol diacrylate mixed substrate membrane, preparation and application
  • MOFs (metal-organic frameworks)-cross-linked polyethylene glycol diacrylate mixed substrate membrane, preparation and application
  • MOFs (metal-organic frameworks)-cross-linked polyethylene glycol diacrylate mixed substrate membrane, preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 2 g of PEGDA-700 and 0.002 g of benzoin dimethyl ether into 2 g of isopropanol solution, stir to dissolve completely. Then, 0.2 g of ZIF-11 nanoparticles were added into the above polymer solution, and ultrasonicated for 30 minutes to prepare a uniform casting solution. Then stand still for 12 hours for degassing, pour the casting solution between two quartz plates to control the thickness of 100 μm, put it in an ultraviolet crosslinker for 90 seconds (wavelength 312nm) to form a solid film, and then soak in isopropanol for 3 days. Then put it into a vacuum drying oven, vacuumize at 20°C for 12h, then raise the temperature to 50°C and dry for 48h, further remove the residual solvent, and finally obtain a mixed matrix film with a mass fraction of ZIF-11 of 10%. It has been determined that under the conditions of 35°C and 1MPa, CO 2 , N 2 、CH 4 The permeability coefficients are: 125, 2.0, 4.8Barrer; separation selectivity: α CO2 / N2 =61,α CO2 / CH4 =26.

Embodiment 2

[0038] Add 2 g of PEGDA-700 and 0.006 g of HCPK into 2 g of ultrapure water, stir to dissolve completely. Then, 0.2, 0.5, 0.9, and 2 grams of ZIF-7 were added to four identical polymer solutions, ultrasonicated for 10 minutes, followed by degassing under negative pressure for 10 minutes to prepare a casting solution. Irradiate four parts of the casting solution with ultraviolet crosslinking method for 180s to make a solid film, and then soak it in water for 5 days; then put it in a vacuum drying oven, vacuumize it at 20°C for 48h, then raise the temperature to 80°C and dry it for 48h , to further remove the residual solvent, and finally obtain ZIF-7 / cross-linked polyethylene glycol diacrylate mixed matrix films with different mass fractions, and the thickness of the film is 200 μm. Under the conditions of 35°C and 1MPa, the CO of the membrane was tested by a gas permeation device 2 , N 2 、CH 4 Permeability, membrane performance data are shown in Table 1.

[0039] Table 1 ...

Embodiment 3

[0043] Add 2 grams of PEGDA-700 and 0.004 grams of HCPK into 2 grams of solvent (water, methanol and isopropanol, respectively), and stir to dissolve completely. Then add three parts of 0.2 grams of ZIF-90 to the polymer solutions of the above three different solvents, ultrasonically 30min to prepare the casting solution, then let it stand for 12h to defoam, and irradiate the casting solution with ultraviolet crosslinking 150s to form a solid film, and then immersed in the respective solvents for 5 days; then put it into a vacuum drying oven, vacuumize at 30°C for 12h, then raise the temperature to 50°C and dry for 12h, further remove the residual solvent, and finally get ZIF- The mass fraction of 90 is 10% mixed matrix membrane, and the thickness of the membrane is 100 μm. It has been determined that, under the conditions of 35°C and 1MPa, the CO of the membrane is tested by a gas permeation device. 2 , N 2 、CH 4 Permeability, membrane performance data are shown in Table 2...

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Abstract

The invention discloses an MOFs (metal-organic frameworks)-cross-linked polyethylene glycol diacrylate mixed substrate membrane, a preparation and an application. PEGDA (polyethylene glycol diacrylate) is selected as substrate membrane materials, MOFs are selected as fillers, and the MOFs-cross-linked polyethylene glycol diacrylate mixed substrate membrane is prepared by ultraviolet crosslinking and curing under induction of photo-initiators. The mixed substrate membrane has remarkable performances (PCO2>160Barrer, alpha CO2 / N2>70, alpha CO2 / CH4>40) for separating mixed gas of CO2 / N2 and CO2 / CH4. Compared with a pure cross-linked polyethylene glycol diacrylate membrane, the MOFs-cross-linked polyethylene glycol diacrylate mixed substrate membrane has higher CO2 gas permeability and separation selectivity, and can be applied to purification of flue gas and natural gas.

Description

technical field [0001] The invention belongs to the technical field of gas separation membranes, and in particular relates to a mixed matrix membrane crosslinked by MOFs and polyethylene glycol diacrylate, its preparation and application. Background technique [0002] With the increasing consumption of fossil fuel resources, CO 2 The content in the atmosphere is increasing day by day, the greenhouse effect and the resulting environmental problems are becoming more and more serious. CO 2 The separation and capture of has been widely concerned by people from all walks of life. Membrane separation technology is a high technology adapted to the development of contemporary new industries, and is recognized as one of the most promising high technologies from the end of the 20th century to the middle of the 21st century. Membrane separation is the use of natural or artificially prepared membranes with selective permeation properties to separate, fractionate, purify or enrich two-...

Claims

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Application Information

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IPC IPC(8): B01D71/52B01D67/00B01D53/22C01B32/50
CPCB01D53/228B01D67/0006B01D71/52Y02C20/40Y02P20/151
Inventor 潘宜昌向龙王重庆
Owner NANJING UNIV OF TECH
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