The structure and properties of Hydrophilic Membrane
Hydrophilic membrane is a kind of ultrafiltration membrane, you can filter some of the harmful substances in water, this membrane can be filtered under a small pressure of water. Hydrophilic film industry is widely used, has become one of the new chemical unit operation. For the separation, concentration, purification of biological products, pharmaceutical products and food industry; also used for blood treatment, wastewater treatment and ultra-pure water preparation of the terminal treatment device. In our country has been successfully used hydrophilic membrane of Chinese herbal medicine concentrated purification. Hydrophilic membrane with the progress of technology, its screening function will be improved and strengthened, the contribution of human society will be more and more.
The structure of the hydrophilic membrane
The structure of the hydrophilic membrane is symmetrical and asymmetric. The former is isotropic, no cortex, all directions of the pores are the same, belonging to the deep filter; the latter has a more dense surface and finger-based structure of the bottom, the surface thickness of 0.01 microns or less, And has a row of ordered micropores, the bottom thickness of 200 to 250 microns, belonging to the surface filtration. Industrial use of hydrophilic film is generally asymmetric membrane. The membrane material of the hydrophilic film is mainly cellulose and its derivatives, polycarbonate, polyvinyl chloride, polyvinylidene fluoride, polysulfone, polyacrylonitrile, polyamide, polysulfone amide, sulfonated polysulfone, Polyvinyl alcohol, modified acrylic polymers, and the like.
Non-hydrophilic hydrophilic film, in the process of mass transfer, colloid, oil, protein and other pollutants into a cake-like surface attached to the film, through a simple backwash difficult to clean, non-hydrophilic film operating pressure High and high frequency of chemical cleaning;
The hydrophilic hydrophilic membrane in the filtration of the mass transfer process, colloid, oil, protein and other pollutants in the membrane surface agglomeration into a spherical, this spherical aggregates, it is easy to detach from the membrane surface, through a simple anti Wash can be clean, hydrophilic hydrophilic membrane operating pressure is low and chemical cleaning frequency is low.