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Hydrophilic and hydrophobic controllable double-layer membrane, preparation method and application of hydrophilic and hydrophobic controllable double-layer membrane in non-polar solvent system filtration

A water-based, hydrophobic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of reducing substructure resistance, simplifying preparation steps, and excellent non-polar solvent/solute separation performance

Active Publication Date: 2021-02-09
NANJING UNIV OF TECH
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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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  • Hydrophilic and hydrophobic controllable double-layer membrane, preparation method and application of hydrophilic and hydrophobic controllable double-layer membrane in non-polar solvent system filtration
  • Hydrophilic and hydrophobic controllable double-layer membrane, preparation method and application of hydrophilic and hydrophobic controllable double-layer membrane in non-polar solvent system filtration
  • Hydrophilic and hydrophobic controllable double-layer membrane, preparation method and application of hydrophilic and hydrophobic controllable double-layer membrane in non-polar solvent system filtration

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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.

[0...

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Abstract

The invention relates to a hydrophilic and hydrophobic controllable double-layer membrane, a preparation method and application of the hydrophilic and hydrophobic controllable double-layer membrane innon-polar solvent system filtration, and belongs to the technical field of membrane separation materials. The polyimide / polyetherimide flat double-layer membrane with controllable hydrophilicity andhydrophobicity is prepared through one-step co-blade coating. Firstly, a fluorine-substituted aromatic amine monomer is used for forming a non-layered double-layer membrane structure; and secondly, bycontrolling the amount of a perfluorodecylamine monomer, the hydrophilicity and hydrophobicity of the top layer of the double-layer membrane can be accurately adjusted. And finally, the substructureresistance of the double-layer membrane is reduced by doping the nanoparticles in the bottom layer. The obtained membrane has excellent non-polar solvent permeability, and provides valuable guidance for purification and recovery of the non-polar solvent.

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...

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Application Information

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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 UNIV OF TECH
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