Explanation

A hydrophilic separation membrane with a pore size of 5-10nm driven by concentration difference. The principle of action is to make use of the different concentration of solution solute on both sides of the membrane. Under the effect of the concentration difference, the small molecular solute in the macromolecule solution can pass through the dialysis membrane, and the macromolecule solute cannot pass through the dialysis membrane? Thus, macromolecule solute and small molecular solute in the solution are separated, and there is no fluid flow in the dialysis membrane during the permeation process. The solute moves in the form of diffusion. The commonly used dialysis membrane materials mainly include cellulose membrane and synthetic macromolecule membrane. cellulose films include regenerated cellulose films (also known as cellophane), such as copper imitation films, copper ammonia films, saponified cellulose films, and viscose cellulose films; Improved cellulose membrane, such as cellulose acetate membrane and blood imitation membrane. Synthetic macromolecule polymerization membranes include polyacrylonitrile membrane, polymethyl methacrylate membrane, vinyl vinyl alcohol copolymer membrane, polysulfone membrane, polyamide membrane, polyester polymer alloy membrane. Regenerated cellulose membrane is a dialysis membrane with strong hydrophilicity prepared from cellulose; The modified cellulose membrane is a dialysis membrane with weak hydrophilicity prepared from cellulose derivatives, for example, cellulose acetate is prepared by changing the esterification degree of cellulose and controlling the film forming conditions; The synthetic tnacromolecular film is a hydrophobic dialysis membrane with different permeability, which is prepared by selecting corresponding monomer polymerization and then through physical, chemical and other processes. dialysis membrane is mainly used in medicine, preparation, beverage and food, metallurgy, electronics and chemical industry.

Classification