Tannic acid is a specific commercial form of tannin, a type of polyphenol. Its weak acidity (pKa around 10) is due to the numerous phenol groups in the structure. The chemical formula for commercial tannic acid is often given as C76H52O46, which corresponds with decagalloyl glucose, but in fact it is a mixture of polygalloyl glucoses or polygalloyl quinic acid esters with the number of galloyl moieties per molecule ranging from 2 up to 12 depending on the plant source used to extract the tannic acid. Commercial tannic acid is usually extracted from any of the following plant part: Tara pods (Caesalpinia spinosa), gallnuts from Rhus semialata or Quercus infectoria or Sicilian Sumac leaves (Rhus coriaria).

CAS：1401-55-4
中文别名：鞣酸;没食子鞣酸;二倍酸;丹宁酸;炭尼酸;
英文别名：1,2,3,4,6-penta-O-{3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoyl}-D-glucopyranose;2,3-dihydroxy-5-({[(2R,3R,4S,5R,6R)-3,4,5,6-tetrakis({3,4-dihydroxy-5-[(3,4,5-trihydroxyphenyl)carbonyloxy]phenyl}carbonyloxy)oxan-2-yl]methoxy}carbonyl)phenyl 3,4,5-trihydroxybenzoate;Gallotannic acid;Digallic acid;Acidum tannicum;Gallotannin;Tannimum;Quercitannin;Oak bark tannin;Quercotannic acid;Querci-tannic acid;Querco-tannic acid;Tannic acid;Gallotannin Tannin;Glycerite;
分子式：C76H52O46
分子量：1701.2
精确质量：1700.17
Psa：777.98
Logp：4.8381

RTECS号：WW5075000
MDL号：MFCD00066397
EINECS号：215-753-2
BRN号：8186396

外观与性状：淡黄色至黄褐色的固体带有一种微弱气味
密度：2.12 g/cm3
熔点：218°C (分解)
闪点：198°C
折射率：1.927
水溶解性：250 g/L (20 ºC)
稳定性：Stable. Incompatible with metallic salts, strong oxidizing agents, iron and other heavy metals.
储存条件：库房低温通风干燥

RTECS号：WW5075000
安全说明：S24/25; S36; S26; S36/37/39; S22
危险类别码：R40
WGK Germany：2
海关编码：3201909000
危险品标志：Xi
危险性描述：H412
危险性防范说明：P273

生产方法
1.将精萘10 澄清剂、增涩剂、粗油脱臭剂、助香剂；单宁酸可用于鞣革、墨水制造、纸张和丝绸上胶、锅炉除垢等，还可作媒染剂、啤酒和葡萄酒的澄明剂、橡胶的凝结剂等。可用于用于印染、冶金、医药等工业，单宁酸本身毒性很低。铍、铝、镓、铟、铌、钽和锆的沉淀和重量测定。铜、铁、钒、铈和钴的比定测定。蛋白质及生物碱的沉淀剂。钼酸铵滴定铅时的外指示剂。染料媒染剂。
用途
澄清剂、增涩剂、粗油脱臭剂、助香剂；单宁酸可用于鞣革、墨水制造、纸张和丝绸上胶、锅炉除垢等，还可作媒染剂、啤酒和葡萄酒的澄明剂、橡胶的凝结剂等。可用于用于印染、冶金、医药等工业，单宁酸本身毒性很低。铍、铝、镓、铟、铌、钽和锆的沉淀和重量测定。铜、铁、钒、铈和钴的比定测定。蛋白质及生物碱的沉淀剂。钼酸铵滴定铅时的外指示剂。染料媒染剂。