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A high-throughput solvent-resistant interfacial polymerization composite membrane and its preparation method

A technology of interfacial polymerization and composite membrane, which is applied in the field of organic solvent-resistant nanofiltration composite membrane and its preparation, interfacial polymerization composite membrane, and reverse osmosis membrane. Solvent problems and other problems, to achieve the effect of good industrial applicability, simple process, performance increase

Active Publication Date: 2022-03-08
袁书珊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to further improve the performance of the existing interfacial polymerization separation membrane, while overcoming the poor technical problem of resistance to organic solvents, to propose a solvent-resistant gel film (such as poly-p-phenylenediamine terephthalate gel film) Unconventional polymer ultrafiltration membrane is used as the base membrane to prepare high-performance composite membrane; due to the interaction between polymer molecules and monomers in the gel membrane, the interaction of monomers at the interface during interfacial polymerization is greatly reduced. Diffusion speed, which in turn makes the polyamide separation layer obtained in the same reaction time thinner, and the flux of the prepared separation membrane is greater

Method used

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  • A high-throughput solvent-resistant interfacial polymerization composite membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh 2 g of para-aramid fibers and dissolve them in a mixed solution system of 1 g potassium hydroxide and 97 g dimethyl sulfoxide, heat and stir at 25° C. to obtain aramid nanofiber casting solution with a concentration of 2 wt %;

[0039] (2) Coating the casting solution on the non-woven fabric with a scraper machine, the thickness of the scraper is 200 μm, then immersing the non-woven fabric coated with the polymer solution in deionized water, and forming a gel film after 2 minutes;

[0040] (3) Immerse the gel film in 0.01wt% piperazine aqueous solution for 1min, dry it in the air for 2min, then immerse the film in a 4wt% trimesoyl chloride n-hexane solution for 1min, and then treat it in an oven at 60°C for 5min A composite nanofiltration membrane is obtained.

[0041] Separation membrane performance test:

[0042] Separation membrane water flux test, water flux is under certain operating conditions, under unit pressure (P), unit time (t) permeates the volume...

Embodiment 2

[0051] (1) Weigh 2 g of para-aramid fibers and dissolve them in a mixed solution system of 1 g potassium hydroxide and 97 g dimethyl sulfoxide, heat and stir at 25° C. to obtain aramid nanofiber casting solution with a concentration of 2 wt %;

[0052] (2) Coating the casting solution on the non-woven fabric with a scraper machine, the thickness of the scraper is 200 μm, then immersing the non-woven fabric coated with the polymer solution in deionized water, and forming a gel film after 2 minutes;

[0053] (3) Immerse the gel film in 0.04wt% piperazine aqueous solution for 4min, dry it in the air for 2min, then immerse the film in a 1wt% trimesoyl chloride n-hexane solution for 10min, and then treat it in an oven at 90°C for 10min A composite nanofiltration membrane is obtained.

[0054] The prepared composite membrane water flux is 35L / (m 2 bar h), Na 2 SO 4 Rejection rate 99%, MgCl 2 The cut-off is 60%, NaCl cut-off is 17%; under the same cut-off condition, the flux of t...

Embodiment 3

[0056] (1) Weigh 2 g of para-aramid fibers and dissolve them in a mixed solution system of 1 g potassium hydroxide and 97 g dimethyl sulfoxide, heat and stir at 25° C. to obtain aramid nanofiber casting solution with a concentration of 2 wt %;

[0057] (2) The casting liquid is coated on the non-woven fabric by a doctor blade machine, the thickness of the scraper is 200 μm, and then the non-woven fabric coated with the polymer solution is immersed in a 0.1wt% piperazine aqueous solution, after 2min Form a gel film;

[0058] (3) Pour a trimesoyl chloride-n-hexane solution with a concentration of 1 wt% onto the hydrogel membrane containing 0.1 wt% piperazine for 10 min, and then treat it in an oven at 25° C. for 0 min to obtain a composite nanofiltration membrane.

[0059] The membrane flux of the prepared composite nanofiltration membrane is 42L / (m 2 bar h), Na 2 SO 4 Rejection rate 99%, MgCl 2 The cut-off is 75%, and the NaCl cut-off is 31%.

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Abstract

The invention belongs to the field of membrane preparation, and in particular relates to a high-throughput solvent-resistant interfacial polymerization composite membrane and a preparation method thereof. The invention provides a method for preparing a high-throughput interfacial polymerization composite membrane. The preparation method is as follows: a solvent-resistant gel film is used as a base membrane, and then a polyamide functional separation layer is deposited on the base membrane through interfacial polymerization. A high-flux interfacial polymerization composite membrane was obtained on the surface. The present invention uses a gel membrane instead of an ordinary non-gel polymer ultrafiltration membrane as a base membrane to change the diffusion rate of the reaction monomer at the interface during the interfacial polymerization process, thereby preparing an ultra-thin high-flux composite membrane, and the obtained composite membrane The membrane can be applied to reverse osmosis, nanofiltration and organic solvent resistant nanofiltration.

Description

technical field [0001] The invention belongs to the field of membrane preparation, and relates to an interfacial polymerization composite membrane, in particular to a reverse osmosis membrane, nanofiltration membrane, organic solvent-resistant nanofiltration composite membrane and its preparation method. Background technique [0002] Interfacial polymerization is a very general method for preparing reverse osmosis membranes, nanofiltration membranes and organic solvent-resistant nanofiltration composite membranes. During the preparation process, an ultra-thin polyamide separation layer is formed through the reaction of the oil phase monomer and the water phase monomer on the surface of the polymer ultrafiltration base membrane, and finally a composite membrane is obtained. The composite membrane formed by this method usually consists of a non-woven support layer, an ultrafiltration membrane base membrane, and a polyamide functional separation layer. Most of the current com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/76B01D69/12B01D69/02B01D67/00B01D61/02
CPCB01D71/76B01D69/02B01D69/12B01D67/0013B01D61/027B01D2325/30
Inventor 袁书珊王哲
Owner 袁书珊
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