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《CHEMISTRY AND INDUSTRY OF FOREST PRODUCTS》 1997-03
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STUDY ON PREPARATION OF PHARMACEUTICAL TANNIC ACID BY SOLVENT EXTRACTION

Bi Liangwu Wu Zaisong Chen Jiahong Wang Yongmei Wu Dongmei Gu Renxia (Research Institute of Chemical Processing and Utilization of Forest Products,CAF Nanjing 210042)  
Pharmaceutical tannic acid was prepared from industrial tannic acid by ethyl acetate extraction at 50~55℃ for 1~2 h.The yield of the product was ca.85% which contained over 94% of tannic acid.The recovery of ethyl acetate was over 90%.The remaining liquor after ethyl acetate extraction could be used for preparing gallic acid by alkaline hydrolysis.Total yield of pharmaceutical tannic acid and gallic acid was ca.91%.
【CateGory Index】: TQ94
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