Journal of Zhejiang University SCIENCE B
ISSN 1673-1581(Print), 1862-1783(Online), Monthly

2008   Vol. 9   No. 5   p. 401~406

Kinetics of non-catalyzed hydrolysis of tannin in high temperature liquid water

Li-li LU, Xiu-yang LU^†‡, Nan MA

(Institute of Pharmaceutical Engineering, Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, China)
^‡ Corresponding Author
^†E-mail: luxiuyang@zju.edu.cn
Received Dec. 3, 2007; revision accepted Mar. 24, 2008

Abstract: High temperature liquid water (HTLW) has drawn increasing attention as an environmentally benign medium for organic chemical reactions, especially acid-/base-catalyzed reactions. Non-catalyzed hydrolyses of gallotannin and tara tannin in HTLW for the simultaneous preparation of gallic acid (GA) and pyrogallol (PY) are under investigation in our laboratory. In this study, the hydrolysis kinetics of gallotannin and tara tannin were determined. The reaction is indicated to be a typical consecutive first-order one in which GA has formed as a main intermediate and PY as the final product. Selective decomposition of tannin in HTLW was proved to be possible by adjusting reaction temperature and time. The present results provide an important basic data and reference for the green preparation of GA and PY.

Key words: High temperature liquid water, Gallotannin, Tara tannin, Non-catalyzed hydrolysis, Kinetics
doi:10.1631/jzus.B0730098             CLC number: R914

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