Tannic acid 1401-55-4

1. Properties: amorphous loose powder of yellow or brown-yellow color, gradually darkening in air, with strong hygroscopicity.

Melting point (C) : >360

3. Flash point (C) : 198.89

4. Ignition point or ignition temperature (C) : 526.67

5. Solubility: soluble in water and ethanol. Almost insoluble in ether, benzene, chloroform and petroleum ether, ellagic acid contains four phenolic hydroxyl groups, with weak acidity, soluble in alkaline aqueous solution and organic solvents such as benzene and ethyl acetate.

Can be used as a food antioxidant. Commonly used in combination with vitamin E, vitamin C or gallic acid.

Tannin can be used as viscosity reducer and filtration loss reducer in water - based drilling fluid. Also used in tanning to convert raw leather into leather. Tannin has the activity of reacting with protein, polysaccharide, alkaloid, microorganism, enzyme and metal ion, and has the characteristics of antioxidant, free radical capture, bacteriostatic and derivative reaction. At present, it is widely used in food processing, fruit and vegetable processing, storage, cosmetics, medicine and water treatment.

Tannic acid produces the tannic acid protein that is insoluble in water because of can bond with protein, reason is added in shampoo can prevent those who send fiber protein to dissolve and protect a hair, use in fingernail things can increase fingernail strength. Gallic acid and isogallic acid have strong free radical scavenging effect, which is similar to gallic acid and catechin compound. Tannin has astringent and antibacterial properties and is used in clinical treatment of local bleeding. It can be used in toothpaste to protect teeth and prevent gingival bleeding.

Mainly used in medicine, ink, printing and dyeing, leather, metallurgy and other industries and water treatment, tannin in the water treatment process, with flocculation, deoxidation, scale inhibition and bactericidal effect. Because there are a large number of hydroxyl groups in the molecular structure and the carboxyl group produced after partial hydrolysis, the complex formed with calcium and magnesium ions in water can prevent the calcium and magnesium ions in boiler water from forming scale, and can also reduce the deposition of calcium sulfate in cooling water and play a dispersive role. In addition, the cohesion of tannins can concentrate the sediment into water slag, through the sewage discharge boiler and cooling water system.

It can be used as a clarifying agent for light wine and fruit wine. It can also be used as leather tanning preparation.