One-Pot Selective Conversion of Hemicellulose to Xylitol

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• 作者：Karolin Dietrich ; Carlos Hernandez-Mejia ; Peter Verschuren ; Gadi Rothenberg ; N. Raveendran Shiju
• 刊名：Organic Process Research & Development
• 出版年：2017
• 出版时间：February 17, 2017
• 年：2017
• 卷：21
• 期：2
• 页码：165-170
• 全文大小：370K
• ISSN：1520-586X

文摘

Converting hemicellulose into valuable platform chemicals is a key step in developing an integrated biorefinery. Traditionally, hemicellulose conversion into xylitol is done in two steps, using mineral acids and enzymes. Here we report a one-pot hydrolysis–hydrogenation of hemicellulose to xylitol. We used a combination of either heteropoly acid or biomass-derived organic acid and Ru on carbon as catalyst. Silicotungstic acid, phosphotungstic acid, and lactic acid can be used efficiently in the hydrolysis part. Phosphomolybdic acid was not very active (<5% yield). The reduction can be done using either hydrogen gas or isopropanol as the reductant. The entire process runs in water, at relatively mild temperatures and pressures (140 °C and 20 bar). Lactic acid or phosphotungstic acid combined with Ru/C gave around 70% xylitol yield in 3 h using H₂ as a reductant. With isopropanol as a reductant, phosphotungstic acid and Ru/C gave a high xylitol yield (82%), while only ∼20% xylitol yield was obtained with lactic acid.