Industrial products are generally separated by molecular weight method of separation of their products, but with the molecular weight of the membrane is not the perfect way to show the performance, because in addition to the size of the molecular structure of the molecular shape,
Rigid and so on the retention performance also has an impact, obviously when the molecular weight is certain, rigid molecules than easily deformed molecules, spherical and side chain molecules than linear molecules have greater rejection rate.
Currently used as ultrafiltration membrane materials are polysulfone, polysulfone amide, polypropylene cyanide, polyvinylidene fluoride, cellulose acetate and so on.
Microfiltration membranes are generally homogeneous porous membrane, pore size, can be measured by a variety of methods can be directly measured with the aperture to indicate the size of its membrane hole.
Ultrafiltration, microfiltration and reverse osmosis are pressure transfer as the driving force of the membrane separation process, they can be separated from the solution of ions, molecules, solid particles of such a three-stage separation process,
Its division of labor and scope shown in Figure 10-14. Depending on the substance to be separated, different methods are used. But also need to note that the separation between the three separation methods are not very strict.
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