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《Journal of Guizhou University of Technology(Natural Science Edition)》 2008-05
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Pilot-plant-scale Production of High-purity Food Tannin Acid

ZHANG Wei1,XU JING-Yi1,WU Bin2(1.Guizhou Research Institute of Chemical Industry,Guiyang,550002,China;2.Zunyi Shengyuan Fine Chemical CO.,LTD.,Zunyi,568004,China)  
High-purity food tannic acid was prepared in pilot-plant-scale from gallnut by the method of solvent extraction in water and extracting by ethyl acetate and removing color with active carbon.The optimum conditions:leaching temperature is about 70℃,and extraction temperature is 50~60 ℃.It shows that the yield of high-purity food tannic acid is 64.1%,and the content of tannic acid is up to 98.5%,and the consumption of gallnut is 2.8 t/t.
【Fund】: 贵州省科技攻关项目(2002-1074)
【CateGory Index】: TQ94
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