Introduction to the Characteristics of Microporous Filter Membranes

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2022-06-29 14:41

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Introduction to the Characteristics of Microporous Filter Membranes Microporous filter membranes are a membrane separation process driven by pressure. From the perspective of particle or molecular size separation, it is the difference between nanofilters and ordinary filters (such as sand filters, fiber filters, etc.). Based on the isolated particle size, molecular or colloid size, the interaction characteristics between the structure and the membrane surface.
Separation characteristics of microporous filter membranes.
The ultrafiltration separation process has low energy consumption, no chemical reactions, and no phase transitions;
2. Conduct the separation process at room temperature.
3. The separation process is driven by pressure or concentration, with simple equipment and process flow, few rotating equipment, and convenient operation. Management, maintenance, and safety;
4. Modular teaching design adopts different standards, and the separation process is easy to amplify:
5. The application range of materials is wide, and membrane separation technology can use all separation materials within 0.005-0.2 micrometers;
6. Ultrafiltration has a small pore size and can hardly completely remove bacteria, microorganisms, heat sources, viruses, macromolecular organic matter, and colloidal nanoparticles from soil solutions;
7. Effective separation depends on the pore size and shape of the microporous filter membrane and the size and shape of the solute particles. The chemical properties of the solution (such as pH value, electrical properties), composition, and membrane surface structure, electrical properties, and chemical properties (hydrophilicity, hydrophobicity);
8. Dynamically carry out the entire process without forming filter cakes;
9. Using flocculants, the particle size analysis of the effluent particles can be controlled at around 2um.
Microporous membrane filtration.
Ultrafilters can be divided into static filters (terminal filters) and dynamic filters (error flow filters). In the terminal filter, all intercepted parts are deposited on the membrane surface, forming thickened filter cakes over time. During the misflow filtration process, the feed fluid is parallel to the membrane surface, and particles will take advantage of this opportunity to form a covering layer on the membrane surface. At this point, the overflow fluid will suppress the thickness of the cover layer, thereby stably penetrating the fluid.
Pore size and distribution of microporous filter membranes.
The pore size of microporous filter membranes is generally between 0.01 and 0.08 μ Between m. The aperture is just one of them. The pore size of the membrane can also be represented by the molecular weight cut-off date of the microporous filter membrane. The measurement methods for the pore size of microporous filter membranes include the bubble point method. Interception molecular weight method. Nitrogen adsorption method. Gas permeation method. Electron microscope, etc. The bubble point method is relatively simple, but it is generally believed to be more representative. The theoretical basis of bubble point method is capillary phenomenon and is applied to the integrity detection of membrane components. The pore size of the membrane directly affects the separation effect. The smaller the pore size of the membrane, the better the separation effect, and the less likely pollutants are to enter the porous carrier layer. The smaller the pore size, the less likely irreversible scaling is.

Microporous filter membrane,filter

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