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Preparation method of cross-linked modified polyimide organic solvent-resistant composite membrane, prepared composite membrane and application of the membrane

A technology of resistance to organic solvents and polyimide, applied in the field of membrane separation, can solve the problems of poor performance and low flux of nanofiltration membranes, and achieve the effect of improving solvent resistance, good organic solvent resistance and good solvent resistance.

Active Publication Date: 2019-04-26
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problems of the poor performance of the nanofiltration membrane facing the aqueous solution system and the low flux of the polyimide organic solvent-resistant nanofiltration membrane prepared by the phase inversion method, and propose an interface polymerization polyimide Preparation method of amine-resistant organic solvent composite film

Method used

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  • Preparation method of cross-linked modified polyimide organic solvent-resistant composite membrane, prepared composite membrane and application of the membrane
  • Preparation method of cross-linked modified polyimide organic solvent-resistant composite membrane, prepared composite membrane and application of the membrane
  • Preparation method of cross-linked modified polyimide organic solvent-resistant composite membrane, prepared composite membrane and application of the membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Dissolve ethylenediamine in the second organic solvent to prepare a crosslinking agent solution with a concentration of 3% by mass; the concentrations of the aqueous phase monomer solution, the oil phase monomer solution, and the chemical imidization reagent are the same as those in the comparative example.

[0079] The preparation steps of the basement film are the same as those of the comparative example.

[0080] The film-making steps and conditions of the solvent-resistant composite film are as follows:

[0081] Step 1: Soak the base film in the aqueous phase monomer solution for 20 minutes, take it out and dry it, immerse it in the organic phase monomer solution for interfacial polymerization for 60 seconds, take it out and dry it to obtain an interfacial polymerization composite film;

[0082] Step 2: chemically imidize the interfacial polymerization composite membrane in step 1 in a chemical imidization reagent at 40°C for 4 hours, take it out and dry it in the a...

Embodiment 2

[0088] The difference from the comparative example is that the preparation step of the base film includes soaking the non-woven fabric in the dopa compound solution, and the preparation of the composite film includes crosslinking after chemical imidization.

[0089] The concentrations of the aqueous phase monomer solution, the organic phase monomer solution, the imidization reagent, and the crosslinking agent solution are all the same as in Example 1.

[0090] The preparation steps of the base film are as follows: soak the non-woven fabric in 0.5g / L dopamine solution for half an hour, take it out and dry it, then scrape the casting solution containing polyimide on the non-woven fabric, and undergo phase inversion into The membrane is the basement membrane.

[0091] The preparation steps and conditions of the polyimide organic solvent-resistant composite film are the same as those of Example 1, and the test conditions are the same as those of the comparative example.

[0092] ...

Embodiment 3

[0094] The difference from the comparative example is that the aqueous phase monomer solution contains dopamine, and the preparation of the composite membrane includes crosslinking after chemical imidization.

[0095] The monomer solution in the aqueous phase contains 0.05 g / L dopamine, and the remaining components and concentrations are the same as those in the comparative example;

[0096] The preparation steps of the basement film are the same as those of the comparative example.

[0097] The film-making steps and conditions of the solvent-resistant composite film are the same as in Example 1. The test conditions are the same as the comparative example.

[0098] The prepared PI solvent-resistant composite membrane has a rejection rate of 93.4 % for rose bengal RB in ethanol solution at a transmembrane pressure difference of 1.0 MPa and room temperature, and a flux of 3.5 L m −2 h −1 .

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Abstract

The invention discloses a preparation method of a cross-linking modified polyimide organic-solvent-resistant composite membrane and the prepared composite membrane and application of the membrane, wherein the preparation method comprises an interfacial polymerization step, a chemical imidization treatment step, a replacement-solvent replacement treatment step and a cross-linking step. A solvent-resistant nanofiltration membrane prepared by the preparation method is greatly enhanced in solvent resistance; further, the separation property of the membrane is not basically changed; the membrane has quite good solvent permeability, further, is simple in preparation process, and has quite good application prospects at the aspects of the separation of an organic solvent system and the treatment of water containing organic solvents.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a cross-linked modified polyimide organic solvent-resistant composite membrane, the prepared composite membrane and the application of the membrane. Background technique [0002] With its unique separation performance, nanofiltration (NF) membrane can be widely used in many fields such as water treatment, food, medicine, printing and dyeing, and petrochemical industry. However, many industrial processes need to be exposed to a large amount of organic solvents, which requires nanofiltration membranes to have excellent resistance to organic solvents, so it is very important to research and develop organic solvent-resistant nanofiltration membranes (SRNF) with high separation performance. SRNF technology is similar to the general membrane separation process. It has the characteristics of modularization, convenient installation and oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D67/00B01D69/12
CPCB01D67/0006B01D69/125B01D71/64B01D2323/30
Inventor 苏保卫吕利宋晓娟甄宏艳
Owner OCEAN UNIV OF CHINA
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