Abstract
This study investigates the effects of different pre-pulping extraction conditions on two types of raw material, hardwood oak chips and softwood pine chips. The chips were air-dried, and 2-g samples were extracted in a Dionex ASE-200 with alkaline solutions of a partially recovered form of kraft pulping liquor called green liquor (GL). The GL was applied at different alkali charges of 0–5 % on dry wood weight. The extractions were performed at various H-factors from 500 to 1100 with temperatures ranging from 170 to 190 °C. As the alkali charge decreased, the amount of monosaccharides in the extracts increased while the remaining solids decreased. The highest xylose + mannose + galactose (xmg) concentrations (12.73 and 11.12 g/L for extracts derived from hardwood and softwood, respectively) were detected with a hot water extraction (GL 0 %) at 180 °C and an H-factor of 900. However, low amounts of remaining solids were obtained under these conditions (65.77% and 74.42%, for hard- and soft woods, respectively). We also performed an extraction that was scaled-up in a 1-L Parr reactor with 80 g of woodchips under pre-optimized condition through ASE-200. In this condition, the xmg and acetic acid concentrations of the hardwood extracts were 9.74 and 9.94 g/L, respectively, whereas their concentrations in the softwood extracts were 3.59 and 3.76 g/L, respectively.
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Acknowledgments
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science and Technology (MEST) (Grant #: 2012R1A1A1003107). This work was also financed by the International Collaborative R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (Grant #: 20128520100020).
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Kim, S.J., Um, B.H. Comparison of Hemicellulose Extracts from Two Pulping Woodchips with Green Liquor Followed by Scale-Up Pre-Hemicellulose Extraction. Appl Biochem Biotechnol 175, 2501–2515 (2015). https://doi.org/10.1007/s12010-014-1408-y
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DOI: https://doi.org/10.1007/s12010-014-1408-y