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Organic solvent resistant nanofiltration composite membrane as well as preparation method and application thereof

An organic solvent-resistant and composite membrane technology, applied in the field of nanofiltration membranes, can solve problems such as poor stability, limit the application of organic solvent nanofiltration membranes, swelling, etc., achieve stable organic solvent resistance, easy to scale up and popularize, and mild preparation conditions Effect

Active Publication Date: 2021-06-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Although organic solvent nanofiltration membranes have wide application potential in pharmaceutical, fine chemical and petrochemical industries, there are very few commercial organic solvent nanofiltration membranes. The main reason is that (1) most polymer materials have poor stability in organic solvents (including aprotic solvents); (2) organic solvent nanofiltration membranes will swell under long-term immersion in organic solvents, resulting in decreased flux or defective
Most commercial organic solvent nanofiltration membranes are asymmetric membranes prepared by phase inversion method. The main disadvantages of this type of membrane are high price, low permeability and selectivity, and limited chemical stability, which limit the use of organic solvent nanofiltration membranes. Applications

Method used

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  • Organic solvent resistant nanofiltration composite membrane as well as preparation method and application thereof
  • Organic solvent resistant nanofiltration composite membrane as well as preparation method and application thereof

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preparation example Construction

[0017] Specifically, according to some embodiments of the present invention, a method for preparing an organic solvent-resistant nanofiltration composite membrane is provided, comprising the following steps:

[0018] Step 1: contact the support membrane with a monomer solution, the monomer solution includes a monomer with a mass fraction of 0.1-2%, a first acid regulator, a stabilizer of 0-3% and the balance of water, and the monomer includes One or more of the aniline or pyrrole monomers, so that the monomers and stabilizers are adsorbed on the support membrane to obtain a support membrane with the monomers and stabilizers adsorbed;

[0019] Step 2: Contact the support membrane with the monomer and stabilizer adsorbed thereon with the oxidant solution, the oxidant solution includes 0.1-2% oxidant and the balance of water in the mass fraction, the monomer and stabilizer on the support membrane Under the influence of chemical oxidative polymerization, a single polymer functiona...

Embodiment 1

[0045] Prepare an aqueous solution of 1.5% aniline, hydrochloric acid, and 1% polyvinylpyrrolidone, and adjust the pH to 2.5 as a monomer solution; prepare an aqueous solution of 2% ammonium persulfate as an oxidizing agent solution; prepare an aqueous solution of 0.5% glutaraldehyde and hydrochloric acid, pH Adjusted to 2.0, as a crosslinker solution. The polyacrylonitrile support membrane was contacted with a monomer solution at a temperature of 25°C for 30 minutes to remove excess monomer solution, and then contacted with an oxidant solution at a temperature of 25°C for 30 minutes to obtain a single-layer polyaniline composite membrane. Repeat the above operations to obtain two layers of polyaniline composite membranes after washing. The two-layer polyaniline composite membrane was contacted with the cross-linking agent solution for 5 hours, and the organic solvent-resistant nanofiltration composite membrane was obtained after washing with deionized water.

[0046] After t...

Embodiment 2

[0048] Prepare an aqueous solution of 2% o-phenylenediamine, nitric acid, and 2% polyethylene glycol, and adjust the pH to 2.0 as a monomer solution; prepare an aqueous solution of 2% ammonium persulfate as an oxidizing agent solution; prepare 1% adipoyl chloride, hydrochloric acid The n-hexane solution, pH adjusted to 1.0, was used as the crosslinking agent solution. The polyimide support membrane was contacted with a monomer solution at a temperature of 25°C for 60 minutes to remove excess monomer solution, and then contacted with an oxidant solution at a temperature of 25°C for 60 minutes to obtain a single-layer poly-o-aniline composite membrane. Repeat the above operations to obtain two layers of poly-o-aniline composite membranes after cleaning. The two-layer poly-o-aniline composite membrane was contacted with the cross-linking agent solution for 1 hour, and was washed with deionized water to obtain an organic solvent-resistant nanofiltration composite membrane.

[004...

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Abstract

The invention relates to an organic solvent resistant nanofiltration composite membrane and a preparation method and application. The preparation method comprises the following steps: contacting a support membrane with a monomer solution, and adsorbing a monomer and a stabilizer in the monomer solution on the support membrane; contacting the support membrane adsorbed with the monomer and the stabilizer with an oxidant solution, and forming a single-layer polymer functional layer on the surface of the support membrane through a chemical oxidation polymerization reaction; repeating the operation for at least two times, and forming at least two polymer functional layers on the surface of the supporting film; and under the condition that the at least two polymer functional layers have terminal amino groups, enabling the support membrane with the at least two polymer functional layers to be in contact with a cross-linking agent solution, and performing cross-linking reaction to obtain the cross-linked organic solvent-resistant nanofiltration composite membrane, and under the condition that at least two polymer functional layers do not have terminal amino groups, directly taking the support membrane with the at least two polymer functional layers as the organic solvent-resistant nanofiltration composite membrane. The organic solvent-resistant nanofiltration composite membrane is suitable for an organic solvent nanofiltration process.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, and relates to an organic solvent-resistant nanofiltration composite membrane, a preparation method and an application. Background technique [0002] Nanofiltration membrane is a new pressure-driven separation membrane between reverse osmosis and ultrafiltration membranes, with a molecular weight cut-off in the range of 200-1000 Daltons. The operating pressure of the nanofiltration membrane is low, and it has a high rejection rate (greater than 90%) for divalent ions and low molecular weight organic molecules. It is widely used in water treatment, textile printing and dyeing, papermaking, food, medicine, petrochemical and biochemical fields. widely used. At present, most nanofiltration processes are mainly concentrated in aqueous solution systems, while the actual industrial processes are mostly organic solvent systems, such as petrochemical, fine chemical, pharmaceutical, veget...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/00
CPCB01D69/12B01D67/0006B01D61/027B01D2325/30Y02A20/131
Inventor 赵颂何鹏鹏马光清王志
Owner TIANJIN UNIV
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