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Polyvinylidene fluoride membrane with differentiated double-sided hydrophobicity as well as preparation method and application thereof

A polyvinylidene fluoride membrane and polyvinylidene fluoride-based membrane technology are applied in the field of polyvinylidene fluoride membrane and its preparation, which can solve the problem of increasing gas mass transfer resistance, decreasing mass transfer rate, and inability of a membrane contactor to run stably for a long time. and other problems, to achieve the effect of reducing mass transfer resistance, avoiding membrane wetting, and excellent desulfurization performance

Active Publication Date: 2020-06-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the gas mass transfer process of the membrane contactor, there will be membrane wetting on the membrane surface on the side of the absorbing liquid. Based on the fact that the mass transfer rate of the gas in the gas phase is higher than that in the liquid phase, the gas mass transfer resistance increases and the transfer rate increases. The mass rate drops, which leads to the inability of the membrane contactor to operate stably for a long time

Method used

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  • Polyvinylidene fluoride membrane with differentiated double-sided hydrophobicity as well as preparation method and application thereof
  • Polyvinylidene fluoride membrane with differentiated double-sided hydrophobicity as well as preparation method and application thereof
  • Polyvinylidene fluoride membrane with differentiated double-sided hydrophobicity as well as preparation method and application thereof

Examples

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preparation example Construction

[0044] In the present invention, the preparation method of the hydrophobic nanoparticle-polymer suspension preferably comprises the following steps:

[0045] After mixing the non-solvent and the polymer, the first ultrasound and the first stirring are performed in sequence to obtain a mixed solution;

[0046] The solvent and the hydrophobic nanoparticles are sequentially added to the mixed solution, and then the second ultrasonic wave and the second stirring are sequentially performed to obtain a hydrophobic nanoparticle-polymer suspension.

[0047] In the present invention, the time of the first ultrasonic is preferably 0.5~2h, the time of the first stirring is preferably 0.5~2h; the time of the second ultrasonic is preferably 10~30min, and the time of the second stirring is preferably 12 ~16h; both the first stirring and the second stirring are preferably magnetic stirring; after the mixed solution is obtained, the present invention preferably slowly adds the solvent to the ...

Embodiment 1

[0068] The superhydrophobic layer of polyvinylidene fluoride membrane with differential hydrophobicity on both sides is composed of hydrophobic nano-silica (particle size: 30nm) and PVDF (polyvinylidene fluoride film) particles (particle size: 1μm), in which the hydrophobic nanometer The mass ratio of silicon oxide and polyvinylidene fluoride is 1:2.

[0069] The preparation method of the polyvinylidene fluoride film with differential hydrophobicity on both sides is as follows:

[0070] (1) Preparation of polyvinylidene fluoride-based film: Add 16wt.% polyvinylidene fluoride, 8wt.% ethylene glycol and 86wt.% dimethylacetamide into a three-necked flask, and stir evenly at 60°C for more than 6 hours to obtain cast Membrane fluid. The polyvinylidene fluoride-based membrane was prepared by the immersion precipitation phase inversion method (the operation method was the same as step (2) of Comparative Example 1).

[0071] (2) Preparation of silica-polyvinylidene fluoride suspensi...

Embodiment 2

[0082]The superhydrophobic layer of polyvinylidene fluoride film with differential hydrophobicity on both sides is composed of hydrophobic nano-silica (particle size 30nm) and PVDF particles (particle size 1μm), in which the mass of silicon dioxide and polyvinylidene fluoride The ratio is 1:1.

[0083] The preparation method of the polyvinylidene fluoride film with differential hydrophobicity on both sides is as follows:

[0084] (1) Preparation of polyvinylidene fluoride-based film: refer to Example 1, and obtain a polyvinylidene fluoride-based film according to its preparation method.

[0085] (2) The preparation of the silica-polyvinylidene fluoride suspension is the same as that in Example 1, except that: 1wt.% hydrophobic nano-silica, 83wt.% dimethylacetamide.

[0086] (3) The spin-coating steps were the same as in Example 1, and a polyvinylidene fluoride film with differentiated hydrophobicity on both sides was prepared.

[0087] Performance Testing:

[0088] Observat...

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Abstract

The invention relates to the technical field of flue gas desulfurization, and provides a polyvinylidene fluoride membrane with differentiated double-sided hydrophobicity as well as a preparation method and an application of the polyvinylidene fluoride membrane. According to the preparation method, a super-hydrophobic layer with a micro-nano double-coarse structure is constructed on the surface ofone side of the polyvinylidene fluoride base membrane by utilizing the synergistic effect of hydrophobic nanoparticles and polymer particles, so that the polyvinylidene fluoride membrane with differentiated double-sided hydrophobicity is obtained. When the polyvinylidene fluoride membrane with the differentiated hydrophobicity on the two sides is used for removing SO2 through membrane desulfurization, membrane wetting can be effectively avoided, the mass transfer resistance of SO2 on one side of absorption liquid is reduced, the effect of long-term stable operation is achieved, and the polyvinylidene fluoride membrane has excellent desulfurization performance. The preparation method provided by the invention is simple and controllable in process and easily available in raw materials.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a polyvinylidene fluoride film with differential hydrophobicity on both sides and a preparation method and application thereof. Background technique [0002] With the development of society, environmental problems are becoming more and more serious. Industrial production such as fossil fuel combustion and sulfuric acid will produce SO 2 , NO and particulate matter and other pollutants. where SO 2 It is one of the main pollutants in the atmosphere. The secondary pollutants it produces include sulfate, organic sulfate aerosol and acid rain, which cause serious damage to the ecosystem and endanger human health. Therefore, the control of SO in flue gas 2 emissions are imperative. [0003] Traditional flue gas desulfurization technologies mainly fall into three categories: wet desulfurization, semi-dry desulfurization and dry desulfurization. Among them, wet desu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D53/22
CPCB01D53/228B01D67/0088B01D71/34B01D2257/302B01D2258/0283B01D2325/38
Inventor 张玉忠粱晴晴辛清萍李泓
Owner TIANJIN POLYTECHNIC UNIV
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