The transmembrane pressure difference required for membrane separation is generally 0.5 to 2.0MPa, which is 0.5 to 3MPa lower than the pressure difference necessary to achieve the same permeability energy with a reverse osmosis membrane.
Based on the operating pressure and separation limit, NF can be qualitatively ranked between reverse osmosis and ultrafiltration. NF is sometimes called low-pressure reverse osmosis or loose reverse osmosis.
J.E. Cadotte studied NS-300 membrane in the 1970s, which was the beginning of research on NF membrane.
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