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Composite membrane for improving permeation selectivity of polyamide nano filtration composite membrane and preparation thereof

A polyamide nanocomposite membrane technology, applied in reverse osmosis, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of improving permeability and selectivity, accelerating self-inhibition, and making the modification process simple and easy to operate

Active Publication Date: 2021-07-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the problems existing in the above-mentioned technologies, the present invention provides a method for preparing a polyamide nanofiltration composite membrane with high permeation selectivity, and at the same time improves the water penetration and salt retention performance of the polyamide composite membrane to solve the problem of traditional polyamide nanofiltration composite membranes. One of the main problems with membranes

Method used

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  • Composite membrane for improving permeation selectivity of polyamide nano filtration composite membrane and preparation thereof
  • Composite membrane for improving permeation selectivity of polyamide nano filtration composite membrane and preparation thereof
  • Composite membrane for improving permeation selectivity of polyamide nano filtration composite membrane and preparation thereof

Examples

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Embodiment 1

[0038] The experimental operation steps and conditions are the same as those of the comparative example, the difference is that in the step (1), phthalic anhydride is fully dissolved in acetone, and then the acetone solution containing phthalic anhydride is added to the acetone solution containing 0.15w% homogeneous In n-hexane of trimellitic acid chloride, the solution was ultrasonically treated for 15 minutes, wherein the concentration of phthalic anhydride was 0.02 wt%, and the concentration of acetone was 2 wt%, and this solution was used as the organic phase solution.

Embodiment 2

[0040] The experimental operation steps and conditions are the same as those in Example 1, except that the mass concentration of phthalic anhydride is 0.04 wt%.

Embodiment 3

[0042] The experimental operation steps and conditions are the same as those in Example 1, except that the mass concentration of phthalic anhydride is 0.06 wt%.

[0043] The scanning electron microscope pictures of the polyamide nanofiltration composite membrane surface and cross-section prepared by comparative examples and Examples 1 to 3 are as follows: figure 1 Shown, among the figure NFMO, NFM2, NFM4, NFM6 correspond to comparative example, embodiment 1, embodiment 2, the polyamide nanofiltration composite membrane that embodiment 3 prepares respectively, figure 1 The left side is the surface morphology of different polyamide nanofiltration composite membranes, figure 1 On the right is the cross-sectional morphology of different polyamide nanofiltration composite membranes. It can be seen that the membranes are intact and free of defects. It can be seen from the figure that with the increase of phthalic anhydride content, new ring-shaped protrusions are formed on the surf...

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Abstract

The invention relates to a polyamide nano filtration composite membrane and a preparation process thereof. The composite membrane is composed of a non-woven fabric base layer, a polymer mechanical support layer and a modified polyamide active separation layer. The preparation method is characterized in that an inhibitor containing a single reactive group is introduced into an organic phase, and the inhibitor only can react with a polyamine monomer but cannot form a three-dimensional cross-linked structure due to the fact that the inhibitor only has a single reactive group, so that the increase of a polyamide chain is inhibited, and the net structure of a polyamide active separation layer is changed; and meanwhile, a hydrophilic group can be generated in the reaction process of the inhibitor and the polyamine monomer, so that the chemical property and the surface characteristic of the polyamide active separation layer are further changed, and finally, the saline-water separation performance, namely permeation selectivity, of the polyamide nano filtration composite membrane is greatly improved. The modification method has a remarkable effect, does not need a subsequent treatment process, and is easy to realize industrial amplification and large-scale production and application.

Description

technical field [0001] The invention relates to a preparation process of a functional polymer membrane, in particular to a polyamide nanofiltration composite membrane with high permeation selectivity and its preparation. Background technique [0002] Thin film composite membrane (TFC membrane) with polyamide active layer is one of the most widely used polymer separation membranes, generally composed of polyester base layer, microfiltration or ultrafiltration polymer support layer and polyamide active separation thin layer, Among them, the polyester base layer and the polymer support layer are mainly used to improve the mechanical properties of the membrane, and the polyamide active layer plays the main role of separation. The dense polyamide thin layer is prepared by polymerizing the polyamine monomer in the water phase and the polyacyl chloride monomer in the organic phase at the incompatible two-phase interface, and the thickness of the polyamide active layer is 20-200nm ...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D61/02B01D69/10B01D69/12B01D71/56B01D65/10
CPCB01D69/12B01D71/56B01D61/027B01D69/10B01D69/125B01D65/10Y02A20/131
Inventor 曹义鸣秦倚天康国栋于海军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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