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

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第5期9卷 401-406页

作者： Li-li LU Xiu-yang LU Nan MA Institute of Pharmaceutical Engineering Department of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027 China

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.

关键词： high temperature liquid water Gallotannin Tara tannin Non-catalyzed hydrolysis Kinetics

Hydrolysis kinetics of benzyl phenyl ether in high temperature liquid water

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Chinese Chemical Letters 2011年第6期22卷 733-737页

作者： Xiao Yu Wu Xiu Yang Lu Department of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China

The application of high temperature liquid water（HTLW） to decomposition of lignin as efficient and green solution for phenolic compounds recovery was *** phenyl ether（BPE）,the lignin model compound,was treated at temperatures ranging from 220 to 250℃.BPE undergo hydrolysis in HTLW,and main products were phenol and benzyl alcohol with the minimum selectivities of 75.7%and 82.8%,*** temperature led to higher selectivity in 220-250℃temperature *** kinetics on BPE hydrolysis was studied and the activation energy was determined as 150.3±12.5 kJ/mol with the first-order kinetic *** on products distribution,the reaction mechanism for decomposition of benzyl phenyl ether was *** investigated process provides insights into the design of a commercial method for utilization of lignin.

关键词： Hydrolysis Kinetics Benzyl phenyl ether high temperature liquid water Lignin model compound

Enhanced Acid/Base Catalysis in high temperature liquid water

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Chinese Chemical Letters 2006年第6期17卷 841-844页

作者： Xiu Yang LU Qi JING Zhun LI Lei YUAN Fei GAO Xin LIU Department of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027

Two novel and environmentally benign solvent systems, organic acids-ennchea high temperature liquid water （HTLW） and NH3-enriched HTLW, were developed, which can enhance the reaction rate of acid/base-catalyzed organic reactions in HTLW. We investigated the decomposition of fructose in organic acids-enriched HTLW, hydrolysis of cinnamaldehyde and aldol condensation of phenylaldehyde with acetaldehyde in NH3-enriched HTLW. The experimental results demonstrated that organic acids-enriched or NH3-enriched HTLW can greatly accelerate acid/base-catalyzed organic reactions in HTLW.

关键词： high temperature liquid water acid/base-catalysis organic reactions.