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A double-layer membrane with controllable hydrophilicity and hydrophobicity, its preparation method and its application in the filtration of non-polar solvent system

A water-based, affinity-thinning technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of reducing the difference in solubility parameters and excellent non-polar solvent permeability

Active Publication Date: 2022-03-15
NANJING TECH UNIV
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  • Application Information

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Problems solved by technology

However, due to the difference in properties of the two membrane materials, the bilayer membrane is prone to delamination during the phase inversion process.

Method used

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  • A double-layer membrane with controllable hydrophilicity and hydrophobicity, its preparation method and its application in the filtration of non-polar solvent system
  • A double-layer membrane with controllable hydrophilicity and hydrophobicity, its preparation method and its application in the filtration of non-polar solvent system
  • A double-layer membrane with controllable hydrophilicity and hydrophobicity, its preparation method and its application in the filtration of non-polar solvent system

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Experimental program
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Effect test

Embodiment Construction

[0053] Material

[0054] Polyimide (PI, HP Polymer GmbH) and 1000 Polyetherimide (PEI, SABIC) was used as the polymer material for the support layer and the selection layer, respectively. N-methyl-2-pyrrolidone (NMP, AR, Macklin) was used as a solvent for dissolving PI and PEI, and tetrahydrofuran (THF, AR, Sinopharm) was used as a cosolvent. 3,5-bis(trifluoromethyl)benzylamine (BTBA) was purchased from Bidepharm, 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10, 10,10-Heptadecafluoro-1-decylamine (HTFDA) was purchased from Accela, SiO with a particle size of 7 to 40 nm 2 Nanoparticles were purchased from Macklin. Pure solvent permeability tests were performed using methanol (MeOH, AR, Sinopharm), ethanol (EtOH, AR, Sinopharm), isopropanol (IPA, AR, Macklin) and n-hexane (AR, Sinopharm). Tiger bengal sodium salt (RB, AR, C 20 h 2 Cl 4 I 4 Na 2 o 5 , MW: 1017.64g mol -1 , Aladdin). L-alpha-lecithin was purchased from Alfa Aesar to prepare the lecithin / hexane feed solution.

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Abstract

The invention relates to a double-layer membrane with controllable hydrophilicity and hydrophobicity, a preparation method and its application in non-polar solvent system filtration, belonging to the technical field of membrane separation materials. A polyimide / polyetherimide slab bilayer film with controllable hydrophilicity and hydrophobicity was prepared by one-step co-blade coating. First, a delamination-free bilayer membrane structure was formed using fluoroaromatic amine monomers. Second, by controlling the amount of perfluorodecylamine monomer, the hydrophilicity and hydrophobicity of the top layer of the bilayer membrane can be precisely tuned. Finally, the substructural resistance of bilayer films is reduced by doping nanoparticles in the bottom layer. The obtained membrane has excellent non-polar solvent permeability, which provides valuable guidance for the purification and recovery of non-polar solvents.

Description

technical field [0001] The invention relates to a double-layer membrane with controllable hydrophilicity and hydrophobicity, a preparation method and its application in non-polar solvent system filtration, belonging to the technical field of membrane separation materials. Background technique [0002] Non-polar solvents are widely used in industry, such as cleaning agents for electronic parts, solvents for chemical reactions and extractants for small molecule organics. For example, n-hexane (a non-polar solvent) is used as an extractant for extracting lecithin from soybean due to its high efficiency and low cost. However, n-hexane has low toxicity, and the national food safety standard GB28401-2012 food-grade additive phospholipid stipulates that the residual solvent in phospholipid should not exceed 50mg kg -1 . Therefore, it is necessary to separate lecithin and n-hexane in the subsequent process. On the one hand, the content of n-hexane is controlled within the nationa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D69/06B01D67/00
CPCB01D71/64B01D69/06B01D67/0002
Inventor 孙世鹏付正军王振远巢欣旖邢卫红
Owner NANJING TECH UNIV
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