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Energies 2015, 8(2), 1166-1180; doi:10.3390/en8021166

Hot Water Pretreatment of Boreal Aspen Woodchips in a Pilot Scale Digester

Department of Paper and Bioprocess Engineering, SUNY College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY 13210, USA
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Author to whom correspondence should be addressed.
Academic Editor: Thomas E. Amidon
Received: 26 November 2014 / Revised: 23 January 2015 / Accepted: 27 January 2015 / Published: 3 February 2015
(This article belongs to the Special Issue Bioenergy and Biorefining)
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Abstract

Hot water extraction of aspen woodchips was treated at about 160 °C for 2 h with a liquor-to-solid ratio of 4.76:1 in a 1.84 m3 batch reactor with external liquor circulation. Both five-carbon and six-carbon sugars are obtained in the extraction liquor. Xylose and xylooligomers are the main five-carbon sugar in the hot water extract, which reached a maximum concentration of 0.016 mol/L, and 0.018 mol/L, respectively. Minor monosaccharides including galactose, mannose, rhamnose, glucose, and arabinose are also obtained during the hot water extraction. Rhamnose is the main six-carbon sugar in the extraction liquor, which has a maximum concentration of 0.0042 mol/L. The variations of acetyl groups and formic acid are investigated due to their catalytic effect on the extraction reactions. Zeroth-order kinetics models are found to be adequate in describing the dissolved solids, acids, xylose, and xylooligomers. View Full-Text
Keywords: hot-water extraction; kinetics; aspen; xylose; xylooligomers hot-water extraction; kinetics; aspen; xylose; xylooligomers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yan, J.; Liu, S. Hot Water Pretreatment of Boreal Aspen Woodchips in a Pilot Scale Digester. Energies 2015, 8, 1166-1180.

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