Principle of polymeric membrane for separation
Film made of polymer or polymer composite material with function of separating fluid mixture. The membrane separation process is to use a separation membrane as a spacer layer. Under the driving force of pressure difference, concentration difference, or potential difference, the components of the fluid mixture are passed through the membrane at different rates, so that they are concentrated on both sides of the membrane. In order to achieve the purpose of separation, purification, concentration and recycling. The amount of fluid passing through the membrane per unit time (permeation rate), the ratio of the permeability coefficient of different substances (separation coefficient), or the rejection rate of a certain substance are important indicators for measuring the performance of the membrane. Only when the separation membrane is assembled into a membrane separator, the membrane separation system can perform a practical substance separation process. Generally there are flat membrane, tube membrane, roll membrane and hollow fiber membrane separation devices. The membrane separation process is achieved by using a pressure difference, a concentration difference, or a potential difference as a driving force.