Author(s): Kim KH, Tucker M, Nguyen Q
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Abstract Despite high availability and low cost, bark has not actively been considered as a biomass feedstock for producing bio-based products due to its high content of extractives and lignin. In this study, to investigate the feasibility of utilizing bark-rich sawmill residues for producing value-added materials, the mixed Hemlock hog fuel/pin chips (85:15 by dry weight) from a local sawmill were converted into fermentable sugar by two-stage dilute sulfuric acid-catalyzed hydrolysis. Combining the sugar yields from the first-stage (190 degrees C for 150 s with 1.1\% acid) and second-stage (210 degrees C for 115 s with 2.5\% acid) hydrolyses, which aimed to maximize the recovery of mannose/galactose and glucose, respectively, 13.6 g of glucose (46\% theoretical maximum), 10.5 g of mannose and galactose (98\% theoretical maximum), and 2.8 g of xylose (85\% theoretical maximum) were obtained per 100 g of the original dry feedstock.
This article was published in Bioresour Technol
and referenced in Journal of Environmental Analytical Chemistry