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Cerium fluoride porous nanosheet regulated mixed matrix membrane, preparation method and application thereof

A technology of mixed matrix membrane and cerium fluoride, applied in the preparation/treatment of rare earth metal compounds, chemical instruments and methods, nanotechnology, etc., can solve processing difficulties, poor chemical corrosion resistance of polymer materials, gas permeability and selectivity and other problems, to achieve the effects of improving solubility, improving water vapor permeability coefficient and water vapor/nitrogen selectivity, and simple preparation method

Active Publication Date: 2022-01-07
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polymer membrane materials are still the main materials used in the field of gas membrane dehumidification, but a single polymer material has poor chemical corrosion resistance, and it is difficult to improve gas permeability and selectivity at the same time; on the other hand, although inorganic membrane materials are strong High, good acid and alkali corrosion resistance, but difficult to process

Method used

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  • Cerium fluoride porous nanosheet regulated mixed matrix membrane, preparation method and application thereof
  • Cerium fluoride porous nanosheet regulated mixed matrix membrane, preparation method and application thereof
  • Cerium fluoride porous nanosheet regulated mixed matrix membrane, preparation method and application thereof

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preparation example Construction

[0039] An embodiment of the present invention provides a method for preparing a mixed matrix membrane regulated by porous nanosheets of cerium fluoride as described above, which specifically includes the following steps:

[0040] (1) dissolving the polymer matrix in a solvent to prepare a polymer matrix solution;

[0041] Among them, the polymer matrix is ​​polyether block polyamide (PEBAX1074 or PEBAX2533), perfluorosulfonic acid resin, sulfonated polyetheretherketone, sulfonated polysulfone, sulfonated polyethersulfone, sulfonated polyphenylene ethersulfone Any one or a mixture of the two; the mass concentration of the polymer matrix solution is 5% to 20%, and the solvent is one of n-butanol, N-methylpyrrolidone, dimethylacetamide, dimethylformamide or various mixes;

[0042] (2) Add porous cerium fluoride nanosheets to the polymer matrix solution, heat and stir, defoam, form a membrane, remove residual solvent in the membrane, and obtain a mixed matrix membrane regulated b...

Embodiment 1

[0044] Embodiment 1 of the present invention discloses a preparation method of porous cerium fluoride nanosheets, the specific steps are:

[0045] (1) Rinse the instrument with ultrapure water several times until the surface of the instrument is clean; use a three-neck flask to take 360mL of ultrapure water, and inject nitrogen gas with a purity of 99.99% for 1 hour, and keep the nitrogen flow rate at 5mL / min during this period, and pass it into the water for neutralization The airtightness of three-necked flask obtains nitrogen gas ultrapure water;

[0046] (2) Take 100mL of the above nitrogen-gassed ultrapure water in a graduated cylinder, and add 4mL of it to the concentration of 30mg·mL -1 Then add 1.1484g of cerium acetate to the remaining ultrapure water in the three-necked flask to mix, and carry out precipitation reaction at a temperature of 25°C and a speed of 260rpm for 12h to obtain uniform cerium fluoride nanosheets.

Embodiment 2

[0048] Embodiment 2 of the present invention provides a method for preparing a mixed matrix membrane regulated by cerium fluoride porous nanosheets, which specifically includes the following steps:

[0049] (1) Dissolve 1 g of polyether block polyamide (PEBAX1074) polymer in 14 g of n-butanol at 90°C under reflux for 4 hours until a uniform polyether block polyamide (PEBAX1074) solution is obtained;

[0050] (2) Add 0.025 g of the cerium fluoride nanosheets prepared in Example 1 into 5 g of n-butanol, stir at room temperature for 2 h, then put it into a 250 W ultrasonic cleaning machine, and ultrasonically react for 2 h until sufficient dispersion is achieved.

[0051] (3) The nanosheet dispersion was added to the polyether block polyamide (PEBAX1074) solution, and the resulting solution mixture was continuously stirred for 4 hours, and then ultrasonically degassed for 2 hours. Prepare the membrane casting solution,

[0052] (4) Finally, the mixed solution was poured on a gla...

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Abstract

The invention discloses a cerium fluoride porous nanosheet regulated mixed matrix membrane, a preparation method and application thereof, and belongs to the technical field of gas separation membranes. Specifically, the invention discloses a cerium fluoride porous nanosheet, which is formed by arranging fluorine-cerium monatomic layers and acetate radicals which are alternately stacked between the layers, wherein the fluorine-cerium monatomic layers are formed by arranging fluorine atoms and cerium atoms in a six-membered ring honeycomb form. The invention further provides a cerium fluoride porous nanosheet regulated mixed matrix membrane composed of the cerium fluoride porous nanosheet and a polymer matrix. The invention also provides a preparation method of the cerium fluoride porous nanosheet and a preparation method of the cerium fluoride porous nanosheet regulated mixed matrix membrane, wherein the preparation method is simple to operate. According to the invention, the cerium fluoride porous nanosheet filled polymer matrix membrane is applied to gas dehumidification / humidification, water vapor is permeated preferentially, and the high separation performance on water vapor is achieved.

Description

technical field [0001] The invention relates to the technical field of gas separation membranes, in particular to a mixed matrix membrane regulated by porous nanosheets of cerium fluoride and its preparation method and application. Background technique [0002] Most of the flue gas desulfurization adopts the wet desulfurization process, which can reduce the temperature of the flue gas to 45-55°C, and enter the atmosphere directly through the chimney. When it condenses, it will condense into tiny droplets and produce a white plume, commonly known as big white smoke. The white plume will cause serious environmental pollution, and the flue gas dehumidification process can be implemented to eliminate the plume. At present, flue gas dehumidification technology includes flue gas direct heating technology, flue gas condensation technology and condensation-reheating technology, all of which can achieve the purpose of eliminating smoke plume. The flue gas direct heating technology c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/265C01F17/10B01D69/08B01D69/06B01D69/04B01D71/68B01D71/80B01D67/00B01D53/26B01D53/22B82Y30/00B82Y40/00
CPCC01F17/265C01F17/10B01D69/08B01D69/06B01D69/04B01D71/80B01D71/68B01D67/0079B01D53/228B01D53/268B82Y30/00B82Y40/00C01P2004/20C01P2004/04C01P2006/17
Inventor 张玉忠王丰恺辛清萍李泓
Owner TIANJIN POLYTECHNIC UNIV
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