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Preparation method and application of a high-throughput cross-linked polyimide solvent-resistant nanofiltration membrane

A polyimide and nanofiltration membrane technology, applied in the field of membrane separation, can solve the problems of low flux of solvent-resistant nanofiltration membrane and poor solvent resistance of nanofiltration membrane, so as to improve separation performance and pollution resistance, and improve separation Performance and solvent resistance, the effect of increasing the rejection rate

Active Publication Date: 2021-08-03
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a high-flux interfacial polymerization solvent-resistant nanofiltration membrane for the technical problems of the poor solvent resistance of the nanofiltration membrane facing the aqueous solution system in the prior art and the low flux of the phase inversion method solvent-resistant nanofiltration membrane. The preparation method, the prepared SRNF membrane has good solvent resistance, and has a high solvent flux and organic dye removal rate, which improves the performance of the membrane as a whole

Method used

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  • Preparation method and application of a high-throughput cross-linked polyimide solvent-resistant nanofiltration membrane
  • Preparation method and application of a high-throughput cross-linked polyimide solvent-resistant nanofiltration membrane

Examples

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Effect test

Embodiment 1

[0082] The difference from Comparative Example 1: After the interfacial polymerization, polyethylenimine modification reagent with a concentration of 0.25% by mass was used to modify the original membrane with polyamine.

[0083] Solution preparation: polyethyleneimine was dissolved in deionized water to prepare a modification reagent with a concentration of 0.25% by mass.

[0084] The preparation steps of the base film are the same as in Comparative Example 1.

[0085] The aqueous phase monomer solution, the oil phase monomer solution, and the crosslinking reagent are all the same as in Comparative Example 1.

[0086] The membrane-making steps and conditions of the solvent-resistant nanofiltration membrane are as follows:

[0087] Step 1: Fully contact the surface of the basement membrane with the aqueous phase monomer solution containing diamine compounds for 30 seconds, remove the excess water phase, and fully contact the surface of the basement membrane after drying with ...

Embodiment 2

[0094] The difference from Comparative Example 1: After the interfacial polymerization, the original eco-membrane was modified with polyamines with an additive-free mass percentage concentration of 0.25% polyethyleneimine modification reagent; the post-crosslinking was secondary crosslinking; first, 10.0% Hexamethylenediamine-isopropanol solution was crosslinked at 60°C for 2h, followed by 5.0% ethylenediamine-isopropanol solution at 60°C for 1h.

[0095] Solution preparation:

[0096] Dissolve polyethyleneimine in deionized water to prepare a modification reagent with a concentration of 0.25% by mass.

[0097] Dissolve ethylenediamine (EDA) in isopropanol to prepare the second cross-linking reagent with a concentration of 5.0% by mass.

[0098] The preparation steps of the base film are the same as in Comparative Example 1.

[0099] The aqueous phase monomer solution, the oil phase monomer solution, and the first crosslinking reagent are all the same as in Comparative Examp...

Embodiment 3

[0103] The difference from Comparative Example 1: During interfacial polymerization, soluble inorganic salts are added to the aqueous phase solution; after interfacial polymerization, a polyethyleneimine modification reagent with a mass percent concentration of 0.25% is used to modify the original ecological membrane with polyamines; the crosslinking conditions are 60°C, 2h.

[0104] Solution preparation:

[0105] Dissolve m-phenylenediamine and calcium chloride in deionized water, mix them evenly, and form an aqueous phase solution with m-phenylenediamine and calcium chloride mass percent concentrations of 2.0% and 1.0% respectively.

[0106] Dissolve polyethyleneimine in deionized water to prepare a modification reagent with a concentration of 0.25% by mass.

[0107] The preparation steps of the base film are the same as in Comparative Example 1.

[0108] The oil phase monomer solution and the crosslinking reagent are the same as those in Comparative Example 1.

[0109] A...

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Abstract

A preparation method of a high-throughput cross-linked polyimide solvent-resistant nanofiltration membrane, comprising an interface polymerization step, a polyamine modification step, a chemical cross-linking step, and a solvent activation step. The invention significantly improves the separation performance and solvent resistance performance of the membrane by modifying the surface of the original membrane with polyamines after interfacial polymerization. The polyamine has more free amino groups, which greatly enhances the degree of crosslinking of the interfacial separation layer and effectively improves the solvent resistance of the membrane; by using polyamine modification reagents containing different additives, the separation of the membrane can be effectively improved. performance. The preparation process of the invention is simple, and has good application prospects in the field of organic solvent system separation and water treatment 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 and application of a high-throughput cross-linked polyimide solvent-resistant nanofiltration membrane. Background technique [0002] As a new type of pressure-driven membrane separation technology, nanofiltration (NF) has the characteristics of low operating pressure, selective separation of divalent ions, and high rejection rate of small molecular organics. It has been widely used in water treatment, textile printing and dyeing, food, Medicine, petrochemical and biochemical and many other fields. However, many industrial processes need to use a large amount of organic solvents, which requires the nanofiltration membrane, which is the core part of nanofiltration technology, to have excellent solvent resistance. Therefore, it is particularly critical to research and develop solvent-resistant nanofiltration (SRNF) membranes with high sep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D69/12B01D67/00C02F1/44
CPCB01D67/0093B01D69/125B01D71/64C02F1/442
Inventor 苏保卫许胜杰李树轩王振远李灿杨珊珊
Owner OCEAN UNIV OF CHINA
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