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Plasma electrolytic liquefaction of cellulosic biomass

Plasma Science and Technology 2018年第4期20卷 8-16页

作者：汤丁亮张先徽杨思泽 College of Chemistry and Chemical Engineering Xiamen University Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Institute of Electromagnetics and Acoustics Department of Electronic Science College of Physical Science and Technology Xiamen University

In this paper, the rapid liquefaction of a corncob was achieved by plasma electrolysis, providing a new method for cellulosic biomass liquefaction. The liquefaction rate of the corncob was 95% after 5 min with polyethylene glycol and glycerol as the liquefying agent. The experiments not only showed that H~+ ions catalyzed the liquefaction of the corncob, but also that using accelerated H~+ ions, which were accelerated by an electric field, could effectively improve the liquefaction efficiency. There was an obvious discharge phenomenon, in which the generated radicals efficiently heated the solution and liquefied the biomass, in the process of plasma electrolytic liquefaction. Finally, the optimum parameters of the corncob liquefaction were obtained by experimentation, and the liquefaction products were analyzed.

关键词： plasma electrolysis liquefaction cellulosic biomass polyols

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Ultrasonic-Vibration-Assisted Pelleting of Switchgrass:Effects of Ultrasonic Vibration

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Transactions of Tianjin University 2011年第5期17卷 313-319页

作者：丛威龙裴志坚张鹏飞秦娜 DEINES T W 林彬 Department of Industrial and Manufacturing Systems Engineering Kansas State University Manhattan KS 66506 USA Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 China

Biofuels produced from cellulosic biomass can be used to replace petroleum-based transportation fuels. However, the manufacturing cost of cellulosic biofuels is still high, partly due to the low density of cellulosic feed-stocks. Pelleting of cellulosic feedstocks can increase their density, making their transportation and storage as well as biofuel conversion more efficient and, therefore, reducing the overall cost of biofuel manufacturing. It has been shown that ultrasonic-vibration-assisted (UV-A) pelleting, without using high-temperature steam and binder materials, can produce pellets with density comparable to that produced by conventional pelleting methods. Furthermore, the sugar yield of biomass (wheat straw) processed with UV-A pelleting is 20% higher than that of biomass pelleted without ultrasonic vibration. This paper reports an experimental investigation of UV-A pelleting of switchgrass. The influences of ultrasonic vibration on pellet density, stability, durability, and pelleting force are discussed. It is concluded that pellets processed with ultrasonic vibration had higher density and stability than those processed without ultrasonic vibration, they were more durable than those processed without ultrasonic vibration, and pelleting force with ultrasonic vibration was lower than that without ultrasonic vibration.

关键词： biofuel cellulosic biomass pelleting switchgrass ultrasonic vibration

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Conversion of Sugarcane Shoots and Leaves into Reducing Sugars by Pretreatment and Enzymatic Hydrolysis

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Journal of Life Sciences 2011年第4期5卷 247-254页

作者： Teerapatr Srinorakutara Suthkamol Suttikul Pompattra Srinorakutara Department of Energy Technology Thailand Institute of Scientific and Technological Research Pathum Thani 12120 Thailand Department of Food Technology Thailand Institute of Scientific and Technological Research Pathum Thani 12120 Thailand

Sugarcane shoots and leaves consist of 38% cellulose, 30.6% hemicellulose and 12.8% lignin on dry solid （DS） basis and have the potential to serve as low cost feedstocks for ethanol production. The pretreatment and enzymatic hydrolysis conditions include particle size, alkali （NaOH）/dilute acid （H2SO4） pretreatment, chemical and substrate concentrations, temperature, autoclaving time for pretreatment, enzyme concentration, pH and temperature for hydrolysis varied were evaluated for conversion of sugarcane shoots and leaves cellulose and hemicellulose to reducing sugar. The optimum conditions were accomplished by using 14% w/v DS of 0-10 mm sugarcane shoots and leaves in particle size, pretreated with 1.5% w/v of dilute sulfuric acid at 121℃, 15 lbs/in2 for 15 min and enzymatic saccharification using 40 FPU/g DS cellulose at 50℃ and pH 5, After incubating at 160 rpm for 12 hrs, 59 g/L or 386,38 mg/g DS of reducing sugar and 50.69% saccharification were obtained.

关键词： cellulosic biomass dilute acid pretreatment and enzymatic hydrolysis sugarcane shoots and leaves ethanol production.

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Optimization on Pretreatment and Enzymatic Hydrolysis of Sugarcane Trash for Ethanol Production

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Journal of Food Science and Engineering 2014年第3期4卷 148-154页

作者： Teerapatr Srinorakutara Suthkamol Suttikul Ekarat Butivate Vishnu Panphan Nassapat Boonvitthya Department of Energy Technology Thailand Institute of Scientific and Technological Research (TISTR) Pathum Thani 12120Thailand Department of Agricultural Technology Thailand Institute of Scientific and Technological Research (TISTR) Pathum Thani12120 Thailand PTT Research and Technology. Institute PTT Public Company Limited Ayutthaya 13170 Thailand

The present study was conducted for the optimization of pretreatment and enzymatic hydrolysis of lignocellulosic biomass （sugarcane trash）, which is a renewable resource for the production of bioethanol. The pretreatment and enzymatic hydrolysis conditions including alkali （NaOH）/dilute acid （H2SO4）, substrate and chemical concentration for pretreatment, enzyme dosage, pH, temperature and substrate concentration for hydrolysis were varied and evaluated for sugar and ethanol production at the end. The optimum condition was accomplished using 15% w/v DS of 0-2 mm sugarcane trash in size of particle. It was pretreated with two steps of 2% w/v NaOH autoclaving followed by 2% w/v H2SO4 autoclaving with washing step after pretreatment. An enzymatic hydrolysis was then performed using 15% w/v DS pretreated substrate, hydrolyzed with cellulase 50 filter paper unit （FPU）/g DS at 50 ℃ and pH 5. After incubating at 160 r for 48 h, 117.16 g/L reducing sugar was obtained. The achieved sugar after enzymatic hydrolysis was finally fermented to ethanol by Saccharomyces cerevisiae TISTR 5596, with concentration of 48.17 g/L ethanol or yield 0.509 g/g reducing sugars which was equal to 99.81% of theoretical yield.

关键词： cellulosic biomass pretreatment and enzymatic hydrolysis sugarcane trash ethanol production.

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Simultaneous Saccharification and Fermentation of Alkali-Acid Pretreated Sugarcane Trash to Ethanol

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Journal of Environmental Science and Engineering(B) 2015年第9期4卷 476-481页

作者： Suthkamol Suttikul Vishnu Panphan Kitti Orasoon Department of Energy Technology Thailand Institute of Scientific and Technological Research (TISTR) Pathum Thani 12120Thailand

The Simultaneous Saccharification and Fermentation （SSF） of alkali-acid pretreated sugarcane trash to ethanol was optimized using commercial cellulase and Saccharomyces cerevisiae TISTR 5596 cells. Substrate concentration （12.5% w/v, 15% w/v, 17.5% w/v and 20% w/v）, enzyme loading （25 FPU/g Dry Substrate （DS）, 50 FPU/g DS and 75 FPU/g DS）, and temperature （30 ~C, 35 ~C and 40 ~C） were evaluated. The SSF optimal conditions for alkali-acid pretreated sugarcane trash were 20% w/v of substrate concentration, enzyme loading 50 FPU/g DS, temperature 35 ~C, initial pH 5.0 and yeast inoculum 107 cells/mL. Under the above optimal conditions, ethanol concentration was possible to reach in the range between 50.14 g/L and 55.08 g/L at 96 hrs and 144 hrs, respectively. This study could establish the effective utilization of sugarcane trash for bioethanol production using optimized fermentation parameters.

关键词： cellulosic biomass simultaneous saccharification and fermentation sugarcane trash ethanol production.

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