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Effects of hot water extraction pretreatment on physicochemical changes of Douglas fir
Affiliation:1. Materials Science and Engineering Program, Washington State University, Pullman, WA 99164, USA;2. Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA;3. Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164, USA;1. Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, USA;2. Department of Natural Resource Ecology and Management, Oklahoma State University, Stillwater, OK 74078, USA;1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China;2. CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China;3. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China;4. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Department of Hydraulic and Sanitation Engineering, University of São Paulo, AvenidaJoãoDagnone, 1100, São Carlos, SP, Brazil;2. Department of Chemical Engineering, UFSCar, Rodovia Washington Luís, s/n, São Carlos, SP, Brazil;1. Mechanical Engineering, National University of Ireland Galway, Galway, Ireland;2. Ryan Institute for Environmental, Marine and Energy Research, Galway, Ireland;3. Research Centre for Marine and Renewable Energy (MaREI), Ireland;4. School of Physics, Trinity College Dublin, Dublin, Ireland;1. Programa de Celulosa y Papel, Instituto de Materiales de Misiones, Universidad Nacional de Misiones, 1552 Félix de Azara St., C.P.3300, Posadas, Misiones, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C.P.1033, Capital Federal, Argentina
Abstract:Hot water extraction (HWE) is an autocatalytic pretreatment that can be effectively integrated into most of the conversion technologies for extracting hemicelluloses from woody biomass. The objective of this study was to understand the influence of pretreatment factors on removal of hemicelluloses from Douglas fir chips. Compositional change in biomass was analyzed with ion chromatography and further confirmed with Fourier transform infrared spectroscopy (FT-IR). Highest hemicellulose extraction yield (HEY) was estimated to be 67.44% at the optimum reaction time (79 min) and temperature (180 °C) by using response surface methodology (RSM). Experimental results show that the HEY increased from 19.29 to 70.81% depending on the reaction time (30–120 min) and the temperature (140–180 °C). Effects of the severity factor (SF) on the mass removal and compositional changes were also evaluated. Hygroscopicity and thermal stability of wood were improved after HWE pretreatment. Colorimetric analysis showed that temperature has a greater influence on color of the wood chips during HWE pretreatment than dwell time. HWE pretreatment shows great potential for extracting hemicelluloses and altering physicochemical properties of wood in an integrated biorefinery for diversification of product portfolio.
Keywords:Hot water extraction  Douglas fir  Response surface methodology  Hemicellulose  Wood pretreatment  Woody biomass
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