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Dialysis
Dialysis is a process in which solute molecules are diffused through a semi-permeable membrane under the influence of concentration difference. At the same time, osmosis is also accompanied by osmosis, which is the migration of solvent through the membrane, osmosis is also a process driven by the concentration difference, and the osmosis is the opposite. If the permeable components are continuously removed, so that the concentration on both sides is always present, a high standard of separation effect will be obtained. Dialysis is often covered by osmosis in ordinary operations, which reduces the concentration of the original solution and thus reduces the impetus of the whole process, which is a major disadvantage. dialysis is the oldest method, but it has never gone that far with membranes. Dialysis membranes are homogeneous membranes of organic polymers with membrane aperture less than 1μm, and they are a kind of porous membranes without charge. The commonly used materials are cupric ammonia regenerated cellulose, cellulose acetate, polyacrylonitrile, ethylene - vinyl alcohol copolymer and polymethyl methacrylate, poly-sulfone, polyacrylamide and so on.
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Shanghai Industrial and Commercial Bureau 
Hazardous Chemicals Business License (with storage)
Business License (Three Certificates in One)