However, due to the large molecular weight of solute, osmotic pressure is low, can not consider the impact of osmotic pressure.
Microfiltration membrane used for the microporous membrane, the average pore size of 0.02-10, to retain the diameter of 0.05-10 particles or molecular weight greater than 1 million of the polymer material, the operating pressure is generally 0.01 ~ 0.2MPa.
The raw material liquid is under the action of differential pressure, in which water (solvent) flows through the micropores on the membrane to the low pressure side of the membrane as the permeate, and the particles larger than the membrane pores are entrapped to realize the particles in the raw material liquid and the solvent Separation.
Microfiltration process on the retention mechanism of particles is a screening effect, determine the membrane separation effect is the physical structure of the membrane, the shape and size of the hole.
The ultrafiltration membrane is generally an asymmetric membrane, and its manufacturing method is similar to the reverse osmosis method. The active separation layer of the ultrafiltration membrane has numerous irregular holes, and the pore size is different, it is difficult to determine its pore size,
It is difficult to use pore size to determine its separation capacity, so the separation capacity of ultrafiltration membrane with the molecular weight to be expressed. Define the molecular weight of 90% of the material to be retained as the molecular weight of the membrane.
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