What kind of material is the reverse osmosis membrane made of?

Cellulose acetate membrane

Cellulose acetate membrane desalination rate is high, water production can meet the general filtration needs.

But cellulose acetate reverse osmosis membrane hydrolysis will inevitably occur, cellulose acetate reverse osmosis membrane continuous operation of the allowable pH range of 4-6, cleaning is allowed to be the pH range of 3-7, pH value of 5.7 hydrolysis is the slowest, which leads to pretreatment with acid to a large amount of cleaning can be used to choose a narrow range of medicines, it is not easy to get a satisfactory cleaning effect

Aromatic polyhydrazide membrane

Aromatic polyhydrazide membrane is the highest rate of desalination among the three membranes, with a wide range of PH value, 2-11, acid and alkali resistance.

In the following large-scale chemical plants and paint factories in the sewage treatment, are used, more applicable to the use of brackish water desalination, high-purity water preparation, metal wastewater treatment, heavy metal salt recovery and separation of alkaloids, hormones and bacterial disease.

Aromatic polyamide membrane

Polyamide is usually called nylon, it is in the polymer macromolecular chain containing repeated structural units amide groups of heterochain polymers in general, mainly by the dibasic acid and the dibasic amine or amino acid lactam by polycondensation or self-polymerization, is the development of the earliest, the largest use of thermoplastic engineering plastics.

Introduced in the main chain of polyamide, it becomes semi-aromatic or fully aromatic polyamide, which can further improve heat resistance and rigidity. Similar to aliphatic polyamides, aromatic polyamides can be made by polycondensation of a dibasic acid with a dibasic amine. Semi-aromatic polyamides can be made by polycondensation of an aromatic dibasic acid with an aliphatic dibasic acid, and the simplest all-aromatic polyamide is poly , which can be synthesized by self-condensation of aminobenzoic acid. But the main bond in the benzene ring and amide groups dense, and structural symmetry, high melting point, not easy to process, high cost is not easy to industrialize. Currently the most successful all-aromatic polyamide is poly(terephthaloyl-p-phenylenediamine), belonging to the soluble liquid crystal polymer, can be processed into fibers.