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Chlorine-resistant composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and nanofiltration membrane technology, which is applied in the field of membrane separation, can solve problems such as difficulty in obtaining chlorine resistance, and achieve the effects of widening the scope of use, high chlorine resistance, and significant economic benefits

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

However, the inherent chain structure of polyamide polymers makes it difficult to obtain high chlorine resistance

Method used

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  • Chlorine-resistant composite nanofiltration membrane and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of separation membrane:

[0034] Using polyethersulfone as the support layer membrane material and N,N‐dimethylacetamide (DMAc) as the solvent, the polyethersulfone ultrafiltration membrane was prepared by phase inversion method. Using it as the base membrane, the composite nanofiltration membrane functional layer is prepared on it by interfacial polymerization method. The details are as follows: 2 wt% of melamine is used as the monomer of the water phase, 0.5% of trimesoyl chloride is used as the monomer of the organic phase, n-hexane is used as the solvent, and the film is prepared by interfacial polymerization. The formed primary film was dried in an oven at a temperature of 60° C. for 5 minutes.

[0035]

[0036] (2) Application:

[0037] The treatment solution is 1 g / L sodium sulfate solution containing 0.2% NaClO. When the external pressure is 0.4MPa, the rejection rate of the separation membrane to the inorganic salt sodium sulfate is 88%, a...

Embodiment 2

[0039] (1) Preparation of separation membrane:

[0040]Using polyethersulfone as the support layer membrane material and N,N‐dimethylacetamide (DMAc) as the solvent, the polyethersulfone ultrafiltration membrane was prepared by phase inversion method. Using it as the base membrane, the composite nanofiltration membrane functional layer is prepared on it by interfacial polymerization method. The details are as follows: 2 wt% of melamine and 0.5% of piperazine are used as water phase monomers, 0.5% of trimesoyl chloride is used as organic phase monomers, n-hexane is used as solvent, and the film is prepared by interfacial polymerization. The formed primary film was dried in an oven at a temperature of 60° C. for 5 minutes.

[0041] (2) Application

[0042] The treatment solution is 1 g / L sodium sulfate solution containing 0.2% NaClO. When the external pressure is 0.4MPa, the rejection rate of the separation membrane to inorganic salt ions is 95%, and the water flux can reach ...

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Abstract

The invention belongs to the technical field of membrane separation, and provides a chlorine-resistant composite nanofiltration membrane and a preparation method thereof. The chlorine-resistant composite nanofiltration membrane has charge performance, and comprises a separation function layer and a support layer, wherein the support player is positioned under the separation function layer. The chlorine-resistant composite nanofiltration membrane prepared by the preparation method provided by the invention can be a flat membrane and can also be a hollow fiber membrane. The chlorine-resistant composite nanofiltration membrane monomer has melamine of a triazine ring structure and is subjected to crosslinking treatment, so that the composite membrane has significantly higher chlorine resistance than a commercial polyamide composite membrane, the limitation that the current commercial nanofiltration membrane cannot be used in the environment including residual chlorine is broken, and thus complexity of pretreatment can be greatly reduced, and the application environment is wide.

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. Background technique [0002] Nanofiltration membrane technology is a new energy-saving and environmentally friendly separation technology. It uses selective nanofiltration membrane as the separation medium. Under the action of pressure difference, it can selectively separate high-priced inorganic salts and water through the sieving effect and the Donnan effect. , and then achieve the purpose of separation and purification. Compared with traditional separation methods, this method has significant advantages in economic effect, high separation efficiency, convenient operation, small footprint, and easy scale-up and integration. [0003] Membrane technologies currently used in seawater desalination, brackish wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/00B01D71/68C02F1/44
CPCB01D69/12B01D61/027B01D67/0079B01D71/68B01D2325/30C02F1/442
Inventor 韩润林代岩
Owner DALIAN UNIV OF TECH
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