An improved method for pretreatment of lignocellulosic biomass with high temperature liquid water
A lignocellulosic, high-temperature liquid water technology, applied in chemical recovery, fermentation, etc., can solve the problems of hindering cellulase and cellulose dehydrolysis, hemicellulose cannot be further hydrolyzed, and lignin removal rate is low. Achieve high-efficiency hydrolysis, increase heat and mass transfer effect, and facilitate subsequent conversion and utilization
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Embodiment 1
[0018] Embodiment 1: High temperature liquid water / tetrahydrofuran system
[0019] Using switchgrass as a raw material, pulverize it to 100-200 mesh, put it into an intermittently stirred high-pressure reaction tank, add a tetrahydrofuran / water mixed solution with a volume concentration of 1% according to the substrate mass concentration of 10%, and seal the reaction system. Heat to 165-175°C and stir at 500rpm, feed carbon dioxide to keep the reaction pressure at 3Mpa and hydrolyze for 40min. The removal rate was 74.5%, and the direct distillation of the liquid phase reclaimed tetrahydrofuran and was recycled as the next reaction solution. The remaining water phase was analyzed by high performance liquid chromatography, and the recovery rate of total xylose (comprising xylose and xylooligosaccharides) was 81.8%. %, which is about 3 times that of the case without adding tetrahydrofuran (the high-temperature liquid water treatment conditions are the same). The solid phase resi...
Embodiment 2
[0020] Embodiment 2: high temperature liquid water / tetrahydrofuran system
[0021] Using rice straw as raw material, pulverize it to 100-200 mesh, put it into the intermittent stirring high-pressure reaction tank, add tetrahydrofuran / water mixed solution with a volume concentration of 70% according to the substrate mass concentration of 15%, and seal the reaction system. Heating to 175-185°C with a stirring speed of 500rpm, feeding nitrogen to maintain the reaction pressure at 4Mpa and hydrolyzing for 30min, after the reaction, collecting the reactants for solid-liquid separation, solid-phase composition analysis shows that the retention rate of cellulose is 94.4%, lignin The removal rate was 82.3%, and the direct distillation of the liquid phase reclaimed tetrahydrofuran and was recycled as the next reaction solution. The remaining water phase was analyzed by high performance liquid chromatography, and the recovery rate of total xylose (comprising xylose and xylooligosaccharid...
Embodiment 3
[0022] Embodiment 3: high temperature liquid water / furfural system
[0023] Use poplar sawdust as raw material, crush it to 100-200 mesh, put it into a high-pressure reaction tank, add furfural / water mixture with a volume concentration of 50% according to the substrate mass concentration of 20%, seal the reaction system, and heat to 185-195°C, the stirring speed is 500rpm, and sulfur dioxide is introduced to keep the reaction pressure at 5Mpa to hydrolyze for 50 minutes. After the reaction, the solid-liquid separation is carried out directly. The water layer is mainly sugar products, and the furfural layer is mainly sugar degradation products and lignin degradation. Product, the aqueous phase is analyzed by high-performance liquid chromatography, and the recovery rate of total xylose (including xylose and xylo-oligosaccharides) is 75.7%, which is about 5 times that of the situation without adding furfural (the high-temperature liquid water treatment conditions are the same). T...
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