Ultrafiltration (UF) i s a separation principle for screening. It takes pressure as the driving force to realize mechanical membrane separation process, namely under certain pressure, when the mixed solution of large molecules or a small molecule solute through the membrane surface, solvent (e.g., inorganic salt) and small molecule solutes through the membrane, and the solute molecules due to mechanical filtration membrane as concentrate intercept, So as to achieve the purpose of purification, separation and concentration.
