There are many polymer materials for membrane production, and cellulose acetate is one of the most widely used membrane materials.
There are many polymer materials for membrane production, and cellulose acetate is one of the most widely used membrane materials.
Cellulose acetate is obtained by acetylating a hydroxyl group in a glucose molecule of cellulose, and the higher the degree of acetylation, the more stable it is. Therefore, a film is usually produced from cellulose triacetate. Cellulose acetate has certain hydrophilicity and high transmission speed, and has a strong membrane retention ability, and is suitable for manufacturing reverse osmosis membrane, ultrafiltration membrane and microfiltration membrane, and has abundant raw material sources.
Disadvantages of cellulose acetate membrane: the maximum use temperature is 30 ° C; the optimum pH value is 4 ~ 6, the pH value can not exceed 2 ~ 8 (because the acidic conditions will cause the glycosidic bond in the molecule to hydrolyze, under alkaline conditions will take off Deacetylation; easy to work with chlorine, resulting in reduced membrane life (free chlorine content should be <0.1mg / L when used, short-term exposure can be resistant to chlorine 10mg / L); because the cellulose skeleton is susceptible to bacterial invasion, it is difficult Storage.
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