|
CAS : 1401-55-4
formula : C76H52O46
MW : 1701.23
Melting Point : 218-219 ° C
Chinese name : Tannin; Tannic acid; Tannin; Twice acid; Larch extract; Gallic Tannin; Tannins ; tannins
English title : Tannins; Tannic acid; Digallic acid; chestnut tannins; MIMOSA tannins; quebracho tannin
nature Description : pale yellow amorphous powder or loose a shiny Flake or cavernous solid. 210-215 ° C in most of decomposition of coke sexual gallic acid and carbon dioxide. Dissolved in water, ethanol, acetone and glycerol, almost insoluble in ether, benzene, chloroform and petroleum ether. A special micro-odor strongly Factors of. Lu and his home can darken the air. No foul, combustible. Met-protein, starch, gelatin and many alkaloids and metal salts precipitated case molysite also have black or precipitation. A flash point of 187 ° C, 526.6 ° C spontaneous combustion point. Tannin is not a single compound, complex chemical composition, can be largely classified into two categories :
â‘?tannin is flavanols books biology, molecular flavanol the two carbon - carbon bond and catechol or pyrogallol combination.
â‘?hydrolyzable tannins, molecular bonding with ester is glucose gallate. The latter is commonly used tannic. By our gallnut be tannin-containing glucose about 12%, from the Turkish base gallnut the tannin-containing glucose by 16.5%.
production methods : Tannin exists in a variety of trees (such as oak and sumac), the bark of fruit, these trees insect attacks and generate insect galls the main ingredient in a concentration of 50-70%. Gallnut will smash, remove dead insects and worms, such as the excreta impurities Add copper or wood extraction cans, and use soft water extraction, vacuum concentration extract by adding a small amount of ether, spray drying, in light Tannin. Medicinal Tannin is concentrated liquid ether extraction, leaching solution with a strong bleach sodium, recovery ether, offering medicine with tannin.
purposes : Pharmaceutical Industry Preparation for the reaction of acid, coke reaction of phenol, sulfa drugs raw materials. Tannin is hemostatic, had the medicine for the treatment of angina, tonsillitis, hemorrhoids and skin blister springing can be used for the Suppression of diarrhea, and other intestinal out prepared. Tannin with metals, such as alkaloids and glycosides precipitation formation of these substances have toxic effects. Single prefer for tanning, ink manufacturing, paper and silk on plastic, boiler scale control, but also plays matchmaker dye, beer and wine for clarity, rubber etc, and the condensation of beryllium, aluminum, nickel, copper and other metal reagents. Production in the chemical product, gallic acid and coke sexual gallic acid. Tannin in drilling mud crabs used for dilution. Will tannic with caustic soda powder preparation prorated tannin lye, can reduce the thickening mud cutting edge and sticky banana, improve slurry flow. Conversely, if the tannic powder direct entry into the mud, owing to its weak acid, pH mud caused the decline, with the clay particles through the ion exchange. Lower surface of the clay particles hydration, so that this clay particles mesh structure of the formation, raising mud and the shear viscosity. According to China GB 2760-89, "Curing tannic" for low and Wine, as clarity agent can remove turbidity of suspended substances such as proteins. The food also work to increase as the acerbic agent, crude oil sweetening agent.
Notice:Each item can have many explanations from different angels. If you want grasp the item comprehensively,please see below "more details data". |
Home Products Search Properties Search ä¸æ–‡ç‰ˆ