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Preparation method of solvent-resistant compound nanofiltration membrane

A composite nanofiltration membrane and solvent-resistant technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low solvent permeation flux, good compatibility of alcohol solvents, etc., and achieve excellent stability performance, increase anti-pollution properties, simple reaction

Active Publication Date: 2015-01-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the nanofiltration membrane prepared by the existing method has good compatibility with alcohol solvents, resulting in too low solvent permeation flux, and to provide a method for preparing a solvent-resistant composite nanofiltration membrane

Method used

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  • Preparation method of solvent-resistant compound nanofiltration membrane
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specific Embodiment approach 1

[0018] Specific embodiment one: This embodiment is a preparation method of a solvent-resistant composite nanofiltration membrane, specifically prepared according to the following steps:

[0019] 1. Preparation of ultrafiltration base membrane: First, dissolve the polymer in a solvent to prepare a polymer solution with a mass fraction of 18% to 25%, and then use the immersion-precipitation method to dissolve the polymer with a mass fraction of 18% to 25%. The solution is made into an ultrafiltration basement membrane;

[0020] 2. Preparation of pyrrole-ethanol / graphene oxide solution: first, graphene oxide is ultrasonically dispersed in ethanol, then pyrrole is added, and after mixing, pyrrole-ethanol / graphene oxide solution is obtained; described pyrrole-ethanol / graphene oxide solution The mass fraction of pyrrole is 0.5% to 20%; the mass fraction of graphene oxide in the pyrrole-ethanol / graphene oxide solution is 0.01% to 0.5%;

[0021] 3. Configure strong oxidant solution: ...

specific Embodiment approach 2

[0028] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the polymer described in Step 1 is polyetherimide, polysulfone, polyethersulfone, polyacrylonitrile or polytetrafluoroethylene. Others are the same as the first embodiment.

specific Embodiment approach 3

[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the solvent described in step 1 is N-methylpyrrolidone, dimethylformamide, dimethylacetamide or dimethyl sulfoxide. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a solvent-resistant compound nanofiltration membrane and relates to a preparation method of the membrane. The invention aims at solving the problem of superlow solvent permeation flux caused by good compatibility between an alcohol solvent and the nanofiltration membrane prepared by an existing method. The preparation method comprises the following steps of: (1) preparing an ultrafiltration base membrane; (2) preparing pyrrole-alcohol / graphene oxide solution; (3) preparing a strong-oxidant solution; (4) preparing an ultrafiltration base membrane containing pyrrole; (5) preparing a crude solvent-resistant compound nanofiltration membrane; (6) carrying out optimized treatment, thus obtaining the solvent-resistant compound nanofiltration membrane. The preparation method disclosed by the invention has the advantages that the prepared solvent-resistant compound nanofiltration membrane is a polypyrrole / graphene oxide compound nanofiltration membrane adopting polypyrrole / graphene oxide as a selecting layer; the compound nanofiltration membrane has excellent stability in alcohol substances, maintains high permeation flux and rejection rate, and is applicable to a separating system applying alcohol as medium. The preparation method is mainly used for preparing the solvent-resistant compound nanofiltration membrane.

Description

technical field [0001] The invention relates to a method for preparing a film. Background technique [0002] The nanofiltration process is a new type of pressure-driven physical separation process without phase change. The pore size of the nanofiltration membrane is larger than that of the ultrafiltration membrane but smaller than that of the reverse osmosis membrane. Therefore, when the nanofiltration membrane first came out, it was called a loose reverse osmosis membrane. The average pore size of the nanofiltration membrane is between 0.5 and 2 nm, and the surface is charged. Therefore, the characteristic of nanofiltration membrane is that it has a high rejection rate for divalent and multivalent ions, while the rejection rate for monovalent ions is relatively low. -1 Molecular weight organic molecules have a high rejection rate. Therefore, the nanofiltration process is widely used in many industrial fields such as hard water softening, desalination and concentration of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00
Inventor 邵路程喜全王振兴全帅白永平
Owner HARBIN INST OF TECH
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