Ultrafiltration membrane is widely used in industry and has become one of the new chemical unit operations.
Used for separation, concentration, purification of biological products, pharmaceutical products and food industry;
It is also used for terminal treatment in blood treatment, wastewater treatment and ultra-pure water preparation.
The ultrafiltration membrane has been successfully used in China to purify the Chinese herbal medicine.
With the progress of technology, the filter function will be improved and strengthened, and the contribution to human society will be larger and larger.
Ultrafiltration membranes have symmetrical and asymmetric structures.
The former is isotropic, without the cortex, the pores in all directions are the same, belonging to deep filtration;
The latter has a dense surface and mainly refers to the structure of the ground floor, surface layer thickness of 0.1 microns or less, and have ordered microporous, bottom thickness of 200 ~ 250 microns, belongs to the surface layer filtration.
The ultrafiltration membrane used in industry is usually an asymmetric membrane.
Ultrafiltration membrane material of membrane mainly of cellulose and its derivatives, polycarbonate, polyvinyl chloride (PVC), poly (vinylidene fluoride, polysulfone, polyacrylonitrile, polyamide, polysulfone amide, sulfonated polysulfone, cross-linking of pva, modified acrylic acid polymer, etc.
Ultrafiltration membrane filtration was used for membrane filtration with pressure difference.
The ultrafiltration membrane is mostly made of acetate or a polymer material similar to its properties.
The separation and thickening of solute in solution is most suitable, and it is also used for the separation of colloidal suspensions which are difficult to be accomplished by other separation technologies, and its application field is expanding continuously.