Reverse Osmosis Membrane

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Zibo Dongqiang Membrane Technology Co., Ltd.

Shandong, China

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The reverse osmosis membrane is the core element to realize reverse osmosis, and it is an artificial semipermeable membrane with certain characteristics made by simulating biological semipermeable membranes.
It can intercept substances larger than 0.0001 microns and is a relatively fine membrane separation product.
It can effectively intercept all dissolved salts and organic substances with a molecular weight greater than 100 while allowing water molecules to pass through.
Reverse osmosis membranes are generally made of polymer materials. Such as cellulose acetate film, aromatic polyhydrazide film, and aromatic polyamide film.
The diameter of the surface pores is generally between 0.5 and 10 nm, and the permeability is related to the chemical structure of the membrane itself.
Some polymer materials have good repellency to salt, but the permeation speed of water is not good.
The chemical structure of some polymer materials has more hydrophilic groups, so the permeation speed of water is relatively fast.
Therefore, a satisfactory reverse osmosis membrane should have an appropriate amount of permeation or salt rejection.
There are two types of reverse osmosis membranes: asymmetric membranes and homogeneous membranes.
The currently used membrane materials are mainly cellulose acetate and aromatic polyamides.
Its components are hollow fiber, coil, plate and frame, and tubular.
It can be used for chemical unit operations such as separation, concentration, and purification, and is mainly used in pure water preparation and water treatment industries.