Solvent-resistant nanofiltration membrane and making method thereof

A nanofiltration membrane and solvent-resistant technology, applied in the field of membrane separation, can solve the problems of complex and fragile equipment, small effective area of ​​action, poor stability, etc., and achieve the effect of wide use environment, strong tolerance and excellent solvent resistance

Inactive Publication Date: 2017-08-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the desalination rate of the reverse osmosis method is high, the permeation flux of the membrane is small, and the required operating pressure is relatively high (about 1.5-20MPa); the voltage of the DC electric field in the desalination process of the electrodialysis method is relatively high (100-300V), which is comparable to Compared with the reverse osmosis membrane method, its desalination rate and water recovery rate are lower, and it is prone to concentration polarization, which leads to scaling, and the equipment is complex and vulnerable; the nanofiltration membrane method has a higher separation efficiency in the field of high-priced inorganic salt ion removal. selectivity
In the above-mentioned membrane separation technology, the separation membranes used are all polymer-based separation membranes, and organic solvents are generally used in the preparation process to prepare the separation membrane functional layer or base membrane. Therefore, these membranes are in organic solvents, especially strong polar organic solvents Poor stability, easy to swell or even dissolve
In recent years, ceramic nanofiltration membrane technology with a microporous structure has also been researched and developed, but the inorganic ceramic materials used in this technology have problems such as difficult control of the synthesis process and difficulty in controlling the pore size of the inorganic membrane, and the permeation flux is low, which limits The scope of its industrial application
At the same time, due to the rigidity and brittleness of inorganic materials, the assembly design is limited, the packing density is low, the effective area is small, and the operating cost is high, making it difficult to achieve large-scale application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of separation membrane:

[0031] Using cellulose diacetate as the organic phase and N,N‐dimethylacetamide (DMAc) as the solvent, the cellulose acetate ultrafiltration membrane was prepared by phase inversion method. The solvent-resistant ultrafiltration membrane was prepared by glutaraldehyde cross-linking treatment. Using it as the base membrane, a certain amount of chloromethylated polyphenylsulfone (PPSU) is coated on it, and modified by cross-linking with triethylenetetramine to obtain a solvent-resistant composite separation membrane. The details are as follows: 12wt% cellulose diacetate and 88wt% DMAc are mixed evenly, vacuumized, and the film is scraped on the non-woven fabric, and the phase inversion occurs in the gel bath to obtain the ultrafiltration membrane. Soak in dialdehyde solution for 30 minutes to prepare a solvent-resistant ultrafiltration membrane. Coating 1% chloromethylated polyphenylsulfone on it, and adopting 2% triethylenetetra...

Embodiment 2

[0035] (1) Preparation of separation membrane:

[0036] Use 15wt% cellulose acetate, 3% nano-alumina and 85wt% N,N-dimethylacetamide (DMAc) to mix evenly, vacuumize, scrape the film on the non-woven fabric, and form a film in the gel bath Finally, the solvent-resistant ultrafiltration membrane was obtained by cross-linking in glutaraldehyde solution.

[0037] (2) Application

[0038] The treatment solution was 1 g / L PEG1000 solution containing 30% DMAc. When the external pressure is 0.1MPa, the rejection rate of the separation membrane to PEG1000 is 92%, and the water flux is 176L / m 2 h. The performance of the membrane did not decrease during continuous operation for thirty days.

Embodiment 3

[0040] (1) Preparation of separation membrane:

[0041] The cellulose acetate ultrafiltration membrane was prepared by uniformly mixing 16wt% cellulose acetate and 84% DMAc, defoaming, standing and scraping the membrane. Using 5% glycidyltrimethylammonium chloride for cross-linking and modification treatment, the cellulose sodium filter membrane with high flux is prepared.

[0042] (2) Application

[0043] The treatment solution is 1g / L MgCl 2 solution containing 10% DMAc. When the external pressure is 0.3MPa, the rejection rate of the separation membrane to inorganic salt ions is 75%, and the water flux is 27L / m 2 h.

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Abstract

The invention relates to the technical field of membrane separation, and provides a solvent-resistant nanofiltration membrane and a making method thereof. The solvent-resistant nanofiltration membrane has chargeability, and is an integrated flat or hollow fiber solvent-resistant nanofiltration membrane; or the solvent-resistant nanofiltration membrane has chargeability, and comprises a separation functional layer and a supporting layer which is positioned below the separation functional layer. The solvent-resistant nanofiltration membrane produced in the invention can be a flat membrane, and also can be a hollow fiber membrane. Cross-linking treatment realizes good solvent resistance and wide use environment range, and the solvent-resistant nanofiltration membrane can be applied to the treatment of industrial wastewater containing organic solvents, and especially has high resistance to strong-polarity organic solvents. The limitation that existing commercial nanofiltration membranes can not be used in water containing the strong-polarity organic solvents is solved in the invention, and the application of the nanofiltration membrane can be developed to the petrochemical engineering industry and the field of treatment and reuse of industrial wastewater containing organic solvents.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an organic polymer-based separation membrane suitable for desalination of seawater, desalination of brackish water and removal of heavy metal ions, especially for the treatment of industrial wastewater containing organic solvents. Background technique [0002] Membrane separation process is a kind of speed separation process. It uses selective permeable membrane as the separation medium. When there is a certain driving force (such as pressure difference, concentration difference and potential difference, etc.) Under the action of force, different components have different permeability in the membrane, so that they can selectively permeate the membrane, and then achieve the purpose of separation and purification. Compared with the traditional separation method, this method not only has the advantages of high separation efficiency, low energy consumption, sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D67/00B01D69/12B01D61/14C02F1/44
CPCB01D61/027B01D61/145B01D67/0002B01D67/0079B01D69/12B01D2325/30C02F1/442C02F1/444
Inventor 韩润林
Owner DALIAN UNIV OF TECH
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