Introduction to the principle of membrane separation

Membrane separation principle

Membrane separation is a new separation technology that appeared in the early 20th century and rose rapidly after the 1960s. Membrane separation technology has the functions of separation, concentration, purification and refining, as well as high efficiency, energy saving, environmental protection, molecular-level filtration and simple filtration process, and easy to control. Therefore, it has been widely used in food, medicine, biology, Environmental protection, chemical industry, metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields have produced huge economic and social benefits and have become one of the most important methods in separation science today.

membrane is a material with selective separation function. The process of using membrane selective separation to separate, purify and concentrate the different components of the feed liquid is called membrane separation. It is different from traditional filtration in that the membrane can be separated in the molecular range, and this process is a physical process that does not require phase changes and additives. The pore size of the membrane is generally micron. According to the different pore size (or called the molecular weight cut-off), the membrane can be divided into microfiltration membrane, ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane. According to different materials, they can be divided into Inorganic membranes and organic membranes, inorganic membranes are mainly microfiltration membranes, mainly ceramic membranes and metal membranes. Organic membranes are made of polymer materials, such as cellulose acetate, aromatic polyamide, polyethersulfone, polyfluoropolymer and so on.

Membrane separation advantages

Under normal temperature

There is very little loss of active ingredients, especially suitable for the separation and concentration of heat-sensitive substances, such as antibiotics and other medicines, fruit juices, enzymes, and proteins

No phase change

maintain the original flavor, very low energy consumption, and its cost is about 1/3-1/8 of evaporation concentration or freeze concentration

No chemical change

Typical physical separation process, no chemical reagents and additives are used, and the product is not polluted

Good selectivity

can separate substances at the molecular level, and has excellent performance that cannot be replaced by common filter materials

Strong adaptability

The processing scale can be large or small, continuous or intermittently, with simple process, convenient operation and easy automation

LP21-8040 membrane RO filter

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