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Prehydrolysis ofEucalyptus wood with dilute sulphuric acid: operation in autoclave

Vorhydrolyse von Eukalyptus-Holz mit verdünnter Schwefelsäure im Autoklaven

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Abstract

The production of xylose fromEucalyptus globulus wood samples in media containing sulphuric acid was studied. The prehydrolysis reactions were carried out in autoclave. All the experiments were performed with liquid/wood ratio of 10 g/g. The effects of sulphuric acid concentration (within the range 2–6%), reaction time (0–6 h) and temperature (115 or 130°C) on the type and distribution of reaction products were studied. Xylose was the main compound generated by hydrolysis. The xylose concentration/time series of data were fitted to a kinetic model which provided a close reproduction of experimental results. The concentrations of other reaction products (glucose, arabinose, furfural and acetic acid) in reaction media were also determined. The results obtained are compared with those obtained in experiments carried out at atmospheric pressure.

Zusammenfassung

Die Herstellung von Xylose aus Holz von Eucalyptus globulus mit Hilfe von Schwefelsäure wurde untersucht. Die Vorhydrolyse wurde im Autoklaven durchgeführt. Das Flottenverhältnis (Flüssigkeit/Holz) betrug in allen Experimenten 10 g/g. Der Einfluß der Säurekonzentration (2–6%), der Reaktionszeit (0–6 h) und der Temperatur (115 oder 130°C) auf die Art und Verteilung der Reaktionsprodukte wurde untersucht. Xylose war jeweils das Hauptprodukt der Hydrolyse. Die Ausbeute-Daten wurden durch ein kinetisches Model simuliert, das eine gute Vorhersage der Ergebnisse erlaubt. Die Konzentrationen anderer Reaktionsprodukte wie Glucose, Arabinose, Furfural und Essigsäure wurden ebenfalls bestimmt. Die Ergebnisse wurden mit denjenigen vorangehender Untersuchungen unter Atmosphärendruck verglichen.

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Parajó, J.C., Vázquez, D., Alonso, J.L. et al. Prehydrolysis ofEucalyptus wood with dilute sulphuric acid: operation in autoclave. Holz als Roh-und Werkstoff 52, 102–108 (1994). https://doi.org/10.1007/BF02615474

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