The core component of ultrafiltration technology: ultrafiltration membrane

Ultrafiltration membrane is the core of ultrafiltration technology, and household water purifier using ultrafiltration membrane is the mainstream water purifier product in the market today.

Ultrafiltration membrane is a microporous filter membrane with the same pore size and the rated pore size range of 0.001-0.02 microns.

Ultrafiltration membrane is adopted, and the membrane filtration method driven by pressure difference is ultrafiltration membrane filtration. Ultrafiltration membranes are mostly made of acetate fiber or polymer materials with similar properties. It is most suitable for the separation and concentration of solute in the treatment solution. It is also commonly used for the separation of colloidal suspension which is difficult to be completed by other separation technologies. Its application field is expanding.

 

Membrane filtration driven by pressure difference can be divided into ultrafiltration membrane filtration, microporous membrane filtration and reverse osmosis membrane filtration. They are distinguished according to the minimum particle size or molecular weight that can be retained by the film. When the rated pore size range of membrane is taken as the distinguishing standard, the rated pore size range of microporous membrane (MF) is 0.02 ~ 10 μ m; Ultrafiltration membrane (UF) is 0.001 ~ 0.02 μ m; Reverse osmosis membrane (RO) is 0.0001 ~ 0.001 μ m。 Therefore, ultrafiltration membrane is most suitable for the separation and concentration of solute in solution, or the separation of colloidal suspension which is difficult to be completed by other separation technologies. The membrane technology of ultrafiltration membrane, that is, the technology to obtain the expected size and narrow distribution of micropores, is extremely important. There are many factors controlling pore size. For example, ultrafiltration membranes with different pore size and pore size distribution can be obtained according to the type and concentration of solution during membrane preparation, evaporation and coagulation conditions. Ultrafiltration membranes are generally polymer separation membranes. The polymer materials used as ultrafiltration membranes mainly include cellulose derivatives, polysulfone, polyacrylonitrile, polyamide and polycarbonate.

Ultrafiltration membrane can be made into flat film, coil membrane, tubular membrane or hollow fiber membrane. It is widely used in pharmaceutical industry, food industry, environmental engineering and so on. The sieve is used to sift things. It can release small objects and intercept the larger ones. But have you ever heard of a sieve that can sieve molecules? Super membrane – this super sieve can separate molecules of different sizes! So, what is ultrafiltration membrane? Ultrafiltration membrane is a kind of porous membrane with super “screening” separation function. Its aperture is only a few nanometers to tens of nanometers, that is, only 1 ‰ of a hair! When an appropriate pressure is applied to one side of the membrane, solute molecules larger than the pore size can be screened out to separate particles with molecular weight greater than 500 daltons and particle size greater than 2 ~ 20 nm. The structure of ultrafiltration membrane can be divided into symmetrical and asymmetric. The former is isotropic, without cortex, and the pores in all directions are the same, belonging to deep filtration; The latter has a dense surface layer and a bottom layer dominated by finger structure. The thickness of the surface layer is 0.1 μ m or less, and has ordered micropores. The thickness of the bottom layer is 200 ~ 250 μ m, which belongs to surface filtration.

The ultrafiltration membrane used in industry is generally asymmetric membrane. The membrane materials of ultrafiltration membrane mainly include cellulose and its derivatives, polycarbonate, polyvinyl chloride and polyvinylidene fluoride.

 

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