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Autohydrolysis Pretreatment of Mixed Softwood to Produce Value Prior to Combustion

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Abstract

Autohydrolysis is a hot water pretreatment to extract soluble components from wood that can be used prior to converting the woody residuals into paper, wood products, fuel, or other goods. In this study, mixed softwood chips were autohydrolyzed in hot water at 150, 160, 170, and 180 °C for 1 and 2 h residence times. The objective was to understand the tradeoff between the extraction of fermentable sugar and the residual solid total energy of combustion quantitatively. This process strategy will be referred to as “value prior to combustion”. High-performance liquid chromatography was used to determine chemical compositions (sugars and byproducts such as acetic acid, furfural, and hydroxymethylfurfural) of the extracted liquid and residuals; a bomb calorimeter was used to measure the heating value of original wood and solid residue. As the autohydrolysis temperature increased, material balances of the system indicated higher volatile byproducts loss. More hemicelluloses were solubilized by the hot water extraction process at higher temperatures and longer residence times, and a greater degree of sugar degradation was also observed. The maximum sugar yield was determined to occur at conditions of 170 °C for 2 h, during which 13 g of sugar was recovered from the extract out of 100 g of oven-dried wood. The heating value of the solid residues after extraction was greater than the original wood. The total energy content of the solid residual after extraction ranged from 85 to 98 % of the original energy content of the feed with higher temperatures reducing the total energy content.

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Authors and Affiliations

  1. Department of Forest Biomaterials, College of Natural Resources, North Carolina State University, 1204 Biltmore Hall, Raleigh, NC, 27695-8005, USA

    Yan Pu, Trevor Treasure, Ronalds Gonzalez, Richard A. Venditti & Hasan Jameel

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  1. Yan Pu
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  2. Trevor Treasure
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  3. Ronalds Gonzalez
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  4. Richard A. Venditti
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  5. Hasan Jameel
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Correspondence to Richard A. Venditti.

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Pu, Y., Treasure, T., Gonzalez, R. et al. Autohydrolysis Pretreatment of Mixed Softwood to Produce Value Prior to Combustion. Bioenerg. Res. 6, 1094–1103 (2013). https://doi.org/10.1007/s12155-013-9343-2

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