Ultrafiltration is a screen divided into separate principle, using pressure-driven membrane separation processes, filtration accuracy within the scope 0.005-0.01 µ m, can effectively remove the water particles, colloids, bacteria, heat and macromolecule organic substance. Can be used in material separation, concentration and purification. No transformation of the process of ultrafiltration, operation at room temperature, is particularly suitable for separation of heat sensitive material, and have good resistance to temperature, acid and alkali and oxidation, below 60 c, pH for long-term continuous use under 2-11 conditions.