Membrane separation technology is an interdiscipline novel technology, which aims to separate, purify and enrich different components in the mixtures, the separation includes liquid to liquid, gas to gas, gas to solid, and liquid to gas separation. The working principle is: the equipments adopt the semi-permeable membrane as the filtration layer. The driving force comes from the energy difference at both sides of the membrane; With different passingrate of each composition, the membrane will let some compositions pass while retaining other components.

The key component of the membrane technology is the selective permeable membrane. Membrane separation is a process where different compositions of the fluid products are selectively separated, purified and condensated. The membrane filter differs from the traditional filter in that the membrane filter could realize the molecule level physical separation. It does not need any phase change or chemical additives. The membrane pore size is measured by micron. It can be divided into four types based on the different pore size: MF, UF, NF and RO membranes, it can also be divided into inorganic and organic membrane based on the material of construction. Inorganic membranes are MF level ceramic and metallic membrane. Organic membranes are made of high polymer materials, such as cellulose acetate, aromatic polyamide, PES, Fluoropolymer PTFE and so on.

If filtration precision reach to molecule or ion level, it may be widely used in drinking water sanitation, air sanitation, oil-water separation, seawater/ saltwater desalination, medicine extraction, wine
and beverage fining, blood and dairy products inspissations, nitrogen generation, gas purification, wastewater treatment, waste gas treatment and so on.