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Preparation method of efficient seawater desalination membrane

A high-efficiency, thin-film technology, applied in the field of separation membranes, to achieve good filtration effect, uniform pore distribution, and mechanical strength requirements.

Pending Publication Date: 2022-04-05
JILIN TEACHERS INST OF ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems in the prior art, the present invention provides a high-efficiency preparation method of seawater desalination membrane, which solves the defects of existing membranes, and uses a sandwich structure to protect polyamide-based membranes with microporous membranes, so as to improve the service life At the same time, the overall structural mechanical strength of the film is high, which meets the current mechanical strength requirements

Method used

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Effect test

Embodiment 1

[0018] A high-efficiency preparation method of seawater desalination membrane is composed of a microporous filter membrane as a surface membrane and a polyamide-based film as a middle layer.

[0019]The microporous membrane uses an alumina microporous membrane as a base membrane, and the microporous membrane contains graphene oxide, wherein the alumina microporous membrane is a modified alumina microporous membrane, and the microporous filter The preparation method of the film includes: a1, adding graphene oxide into absolute ethanol and adding it into a ball mill for ball milling and pressing to form a fine powder slurry, then ultrasonically treating the fine powder slurry for 20 minutes, and pouring into absolute ethanol to form a homogeneous slurry Material; the quality of the graphene oxide and absolute ethanol is 3:2, the temperature of ball milling is 30 ℃, the compression strength is 0.8MPa, the frequency of the ultrasonic is 100kHz, the temperature is 20 ℃, the homogene...

Embodiment 2

[0026] A high-efficiency preparation method of seawater desalination membrane is composed of a microporous filter membrane as a surface membrane and a polyamide-based film as a middle layer.

[0027] The microporous membrane uses an alumina microporous membrane as a base membrane, and the microporous membrane contains graphene oxide, wherein the alumina microporous membrane is a modified alumina microporous membrane, and the microporous filter The preparation method of the membrane includes: a1, adding graphene oxide into absolute ethanol and adding it into a ball mill for ball milling and pressing to form a fine powder slurry, then ultrasonically treating the fine powder slurry for 40 minutes, and pouring into absolute ethanol to form a homogeneous slurry Material; the quality of the graphene oxide and absolute ethanol is 3:3, the temperature of ball milling is 50 ℃, the compression strength is 1.2MPa, the frequency of the ultrasonic is 200kHz, the temperature is 50 ℃, the hom...

Embodiment 3

[0034] A high-efficiency preparation method of seawater desalination membrane is composed of a microporous filter membrane as a surface membrane and a polyamide-based film as a middle layer.

[0035] The microporous membrane uses an alumina microporous membrane as a base membrane, and the microporous membrane contains graphene oxide, wherein the alumina microporous membrane is a modified alumina microporous membrane, and the microporous filter The preparation method of the membrane includes: a1, adding graphene oxide into absolute ethanol and adding it into a ball mill for ball milling and pressing to form a fine powder slurry, then ultrasonically treating the fine powder slurry for 30 minutes, and pouring into absolute ethanol to form a homogeneous slurry Material; the quality of the graphene oxide and absolute ethanol is 3:2, the temperature of ball milling is 40 ℃, the compression strength is 0.9MPa, the frequency of the ultrasonic is 150kHz, the temperature is 40 ℃, the hom...

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Abstract

The invention belongs to the technical field of separation membranes, particularly relates to a preparation method of an efficient seawater desalination membrane, and provides a specific preparation method of a microporous filter membrane and a polyamide-based membrane, and the efficient seawater desalination membrane is formed by compounding a microporous filter membrane serving as a surface membrane and a polyamide-based membrane serving as a middle layer. The defects of an existing film are overcome, the polyamide-based film is protected by the microfiltration film in a sandwich structure mode, the effect of prolonging the service life is achieved, meanwhile, the mechanical strength of the whole structure of the film is high, and the current mechanical strength requirement is met.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a preparation method of an efficient seawater desalination membrane. Background technique [0002] Membrane separation technology has gradually developed into a key technology for seawater desalination due to its outstanding advantages such as high separation efficiency, small footprint, simple process, low energy consumption (no phase change), and convenient operation, and has been highly valued by countries all over the world. Membrane is the core of membrane process, which directly determines the pros and cons of membrane seawater desalination technology. At present, researchers have extensively explored thin-film reverse osmosis technology, which is low-cost, flexible, and low-energy. However, the membrane as the main component of reverse osmosis has the problems of poor chemical resistance, short life, low mechanical strength, and low separation eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/02B01D69/12B01D69/02B01D67/00C02F1/44C02F103/08
CPCY02A20/131
Inventor 王蕾李世哲刘刚
Owner JILIN TEACHERS INST OF ENG & TECH