Kinetic features of xylan de-polymerization in production of xylose monomer and furfural during acid pretreatment for kenaf, forage sorghums and sunn hemp feedstocks [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 662.7 Coke and charcoal
• Thông tin xuất bản: Golden, Colo. : Oak Ridge, Tenn. : National Renewable Energy Laboratory (U.S.) ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2014
• Mô tả vật lý: Size: 13 p. : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 264913
• Chủ đề: 1. 09 biomass fuels; 2. 37 inorganic, organic, physical, and anaylytical chemistry; 3. Acid pretreatment; 4. Sorghum brown-mid rib (bmr); 5. Sunn hemp

Tóm tắt

 A kinetic study of acid pretreatment was conducted for sorghum non-brown mid rib (SNBMR) (<
 i>
 Sorghum bicolor L Moench<
 /i>
 ), sorghum-brown mid rib (SBMR), sunn hemp (<
 i>
 Crotalaria juncea L<
 /i>
 ) and kenaf (<
 i>
 Gossypiumhirsutum L<
 /i>
 ), focusing on rates of xylose monomer and furfural formation. The kinetics was investigated using two independent variables, reaction temperature (150 and 160�C) and acid concentration (1 and 2 wt%), with a constant dry biomass loading of 10 wt% and a treatment time up to 20 min while sampling the mixture every 2 min. The experimental data were fitted using a two-step kinetic model based on irreversible pseudo first order kinetics at each step. Varied kinetic orders on the acid concentration, ranging from 0.2 to >
 3, were observed for both xylose and furfural formation, the values depending on the feedstock. The crystallinity index of raw biomass was shown to be a major factor influencing the rate of both xylose and furfural formation. As a result, a positive correlation was observed between the activation energy and biomass crystallinity index for xylose formation.