Reverse Osmosis Membrane Is The Core Component To Realize Reverse Osmosis

Release time:

2023-01-31

Reverse osmosis membrane is an artificial semi permeable membrane with certain characteristics made by simulating biological semi permeable membrane. It is the core component of reverse osmosis technology. The principle of reverse osmosis technology is to separate these substances from water according to the fact that other substances cannot pass through the semi permeable membrane under the action of higher than the osmotic pressure of the solution. The pore size of reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organics and so on. The system has the advantages of good water quality, low energy consumption, no pollution, simple process and simple operation.

Reverse osmosis membrane is the core component of reverse osmosis. It is an artificial semi permeable membrane with certain characteristics made of simulated biological semi permeable membrane. It is generally made of polymer materials. Such as cellulose acetate film, aromatic polyhydrazide film and aromatic polyamide film. The diameter of surface micropores is generally between 0.5 ~ 10nm, and the permeability is related to the chemical structure of the membrane itself. Some polymer materials have good repulsion to salt, but the transmission speed of water is not good. Some polymer materials have more hydrophilic groups in their chemical structure, so the transmission speed of water is relatively fast. Therefore, a satisfactory reverse osmosis membrane should have appropriate permeability or desalination rate.

The reverse osmosis membrane should have the following characteristics: (1) it should have high desalination rate at high flow rate; (2) High mechanical strength and service life; (3) Able to function under low operating pressure; (4) Resistant to chemical or biochemical effects; (5) It is less affected by pH value, temperature and other factors; (6) The source of raw materials for film making is easy, the processing is simple and the cost is low.

The structure of reverse osmosis membrane includes asymmetric membrane and homogeneous membrane. The membrane materials currently used are mainly cellulose acetate and aromatic polyamide. Its components are hollow fiber type, roll type, plate frame type and tube type. It can be used in chemical unit operations such as separation, concentration and purification. It is mainly used in pure water preparation and water treatment industry.