The Experts below are selected from a list of 97419 Experts worldwide ranked by ideXlab platform
Jay J. Cheng - One of the best experts on this subject based on the ideXlab platform.
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pretreatment of corn stover for Sugar Production with switchgrass derived black liquor
Bioresource Technology, 2012Co-Authors: Jiele Xu, Ximing Zhang, Jay J. ChengAbstract:Abstract To improve the cost-effectiveness of biomass-to-Sugar conversion, sodium hydroxide (NaOH) pretreatment of switchgrass was carried out at 21 °C using previously determined optimum conditions (2% NaOH (w/v), 6 h), and the spent alkaline liquid (black liquor) was collected and used for pretreatment of corn stover, a feedstock exhibiting a higher susceptibility to NaOH attack, for improved enzymatic hydrolysis at a reduced cost. The results showed that, because of the high pH and the appreciable amount of carbohydrates in the black liquor, Sugar Production during enzymatic hydrolysis of corn stover pretreated with black liquor was comparable to that of biomass pretreated with 1% NaOH. After black liquor pretreatment at the best residence time (24 h), the total reducing Sugar, glucose, and xylose yields of corn stover reached 478.5, 287.7, and 145.3 mg/g raw biomass, respectively, indicating the viability of this novel pretreatment technology.
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Pretreatment of Lignocellulosic Biomass with Recycled Black Liquor for Sugar Production
2012 Dallas Texas July 29 - August 1 2012, 2012Co-Authors: Ximing Zhang, Pankaj Pandey, Jay J. ChengAbstract:Corn stover is a promising cellulosic feedstock for bioethanol Production, which showed a higher susceptibility to alkaline pretreatment than switchgrass in our preliminary experiments. To improve the cost-effectiveness of corn stover-based bioethanol Production, the spent alkaline liquid (black liquor) from sodium hydroxide (NaOH) pretreatment of switchgrass at previously determined best conditions (2% NaOH (w/v), 6h, 21 oC) was collected and used for the pretreatment of corn stover at room temperature. The results showed that, the Sugar Productions of corn stover after black liquor pretreatment were comparable with, if not higher than, those after pretreatment using 1% or 2% NaOH solution. After 24-h black liquor pretreatment, the glucose and xylose yields of corn stover during enzymatic hydrolysis reached 287.7 mg/g raw biomass and 145.3 mg/g raw biomass, respectively, which were 71.5% and 63.6% of the theoretical glucose and xylose yields, respectively. The high Sugar Production achieved was due to the high pH of black liquor and its considerable carbohydrate content.
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Dilute sulfuric acid pretreatment of transgenic switchgrass for Sugar Production.
Bioresource Technology, 2011Co-Authors: Xu Zhou, Ziyu Wang, Jay J. ChengAbstract:Conventional Alamo switchgrass and its transgenic counterparts with reduced/modified lignin were subjected to dilute sulfuric acid pretreatment for improved Sugar Production. At 150 °C, the effects of acid concentration (0.75%, 1%, 1.25%) and residence time (5, 10, 20, 30 min) on Sugar Productions in pretreatment and enzymatic hydrolysis were investigated, with the optimal pretreatment conditions determined for each switchgrass genotype based on total Sugar yield and the amounts of Sugar degradation products generated during the pretreatment. The results show that genetic engineering, although did not cause an appreciable lignin reduction, resulted in a substantial increase in the ratio of acid soluble lignin:acid insoluble lignin, which led to considerably increased Sugar Productions in both pretreatment and enzymatic hydrolysis. At an elevated threshold concentration of combined 5-hydroxyfuranmethal and furfural (2.0 g/L), the overall carbohydrate conversions of conventional switchgrass and its transgenic counterparts, 10/9-40 and 11/5-47, reached 75.9%, 82.6%, and 82.2%, respectively.
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Pretreatment of Corn Stover for Sugar Production with Combined Alkaline Reagents
Energy & Fuels, 2011Co-Authors: Ximing Zhang, Jay J. ChengAbstract:Corn stover pretreatment using a combination of sodium hydroxide (NaOH) and calcium oxide (CaO) at room temperature was investigated for improved cost-effectiveness of biomass-to-Sugar conversion in this study. The effects of NaOH loading, CaO loading, and residence time on enzymatic hydrolysis were studied, and the total reducing Sugar yield in the enzymatic hydrolysis was used to evaluate the pretreatment conditions. Compared with NaOH pretreatment, pretreatment with the combination of NaOH and CaO resulted in a similar Sugar Production rate but at a potentially lower cost. The addition of CaO not only increased the alkalinity, which favored biomass digestibility improvement, but also contributed to better biomass preservation in the pretreatment. On the basis of the Sugar Production rate and cost-benefit considerations, the two recommended pretreatment conditions were 3 h, 0.05 g NaOH g–1 raw biomass, 0.1 g CaO g–1 raw biomass and 6 h, 0.05 g NaOH g–1 raw biomass, 0.05 g CaO g–1 raw biomass, at which t...
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pretreatment of switchgrass for Sugar Production with the combination of sodium hydroxide and lime
Bioresource Technology, 2011Co-Authors: Jiele Xu, Jay J. ChengAbstract:Abstract Sodium hydroxide (NaOH) and lime (Ca(OH) 2 ) were innovatively used together in this study to improve the cost-effectiveness of alkaline pretreatment of switchgrass at ambient temperature. Based on the Sugar Production in enzymatic hydrolysis, the best pretreatment conditions were determined as: residence time of 6 h, NaOH loading of 0.10 g/g raw biomass, NaOH addition at the beginning, Ca(OH) 2 loading of 0.02 g/g raw biomass, and biomass wash intensity of 100 ml water/g raw biomass, at which the glucose and xylose yields were respectively 59.4% and 57.3% of the theoretical yields. The Sugar yield of the biomass pretreated using the combination of 0.10 g NaOH/g raw biomass and 0.02 g Ca(OH) 2 /g raw biomass was found comparable with that of the biomass pretreated using 0.20 g NaOH/g raw biomass at the same conditions, while the chemical expense was remarkably reduced due to the low cost of lime and the reduced loading of NaOH.
Junhu Zhou - One of the best experts on this subject based on the ideXlab platform.
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subcritical water hydrolysis of rice straw for reducing Sugar Production with focus on degradation by products and kinetic analysis
Bioresource Technology, 2015Co-Authors: Jun Cheng, Lingkan Ding, Wenlu Song, Feng Qi, Junhu ZhouAbstract:Abstract The competitive reactions of reducing Sugar Production and degradation in the subcritical water hydrolysis of rice straw were investigated to optimise reducing Sugar yield. The optimised conditions (280 °C, 20 MPa, rice straw concentration of 5 wt.% and agitation speed of 200 rpm) resulted in a reducing Sugar yield of 0.346 g/g rice straw because of the enhanced reducing Sugar Production and decreased Sugar degradation. The Sugar yield increased when the temperature increased from 250 °C to 280 °C, but it decreased when the temperature further increased to 300 °C because of the degradation of monosaccharides (e.g. glucose and xylose) into by-products (e.g. 2-methyltetrahydrofuran and acetic acid). A first-order reaction model was developed to elucidate the competitive reaction kinetics of Sugar Production and degradation at various temperatures. The highest reducing Sugar yield based on the model was achieved at 280 °C with the highest Production and lowest degradation rates.
Jiele Xu - One of the best experts on this subject based on the ideXlab platform.
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pretreatment of corn stover for Sugar Production with switchgrass derived black liquor
Bioresource Technology, 2012Co-Authors: Jiele Xu, Ximing Zhang, Jay J. ChengAbstract:Abstract To improve the cost-effectiveness of biomass-to-Sugar conversion, sodium hydroxide (NaOH) pretreatment of switchgrass was carried out at 21 °C using previously determined optimum conditions (2% NaOH (w/v), 6 h), and the spent alkaline liquid (black liquor) was collected and used for pretreatment of corn stover, a feedstock exhibiting a higher susceptibility to NaOH attack, for improved enzymatic hydrolysis at a reduced cost. The results showed that, because of the high pH and the appreciable amount of carbohydrates in the black liquor, Sugar Production during enzymatic hydrolysis of corn stover pretreated with black liquor was comparable to that of biomass pretreated with 1% NaOH. After black liquor pretreatment at the best residence time (24 h), the total reducing Sugar, glucose, and xylose yields of corn stover reached 478.5, 287.7, and 145.3 mg/g raw biomass, respectively, indicating the viability of this novel pretreatment technology.
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pretreatment of switchgrass for Sugar Production with the combination of sodium hydroxide and lime
Bioresource Technology, 2011Co-Authors: Jiele Xu, Jay J. ChengAbstract:Abstract Sodium hydroxide (NaOH) and lime (Ca(OH) 2 ) were innovatively used together in this study to improve the cost-effectiveness of alkaline pretreatment of switchgrass at ambient temperature. Based on the Sugar Production in enzymatic hydrolysis, the best pretreatment conditions were determined as: residence time of 6 h, NaOH loading of 0.10 g/g raw biomass, NaOH addition at the beginning, Ca(OH) 2 loading of 0.02 g/g raw biomass, and biomass wash intensity of 100 ml water/g raw biomass, at which the glucose and xylose yields were respectively 59.4% and 57.3% of the theoretical yields. The Sugar yield of the biomass pretreated using the combination of 0.10 g NaOH/g raw biomass and 0.02 g Ca(OH) 2 /g raw biomass was found comparable with that of the biomass pretreated using 0.20 g NaOH/g raw biomass at the same conditions, while the chemical expense was remarkably reduced due to the low cost of lime and the reduced loading of NaOH.
Jun Cheng - One of the best experts on this subject based on the ideXlab platform.
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subcritical water hydrolysis of rice straw for reducing Sugar Production with focus on degradation by products and kinetic analysis
Bioresource Technology, 2015Co-Authors: Jun Cheng, Lingkan Ding, Wenlu Song, Feng Qi, Junhu ZhouAbstract:Abstract The competitive reactions of reducing Sugar Production and degradation in the subcritical water hydrolysis of rice straw were investigated to optimise reducing Sugar yield. The optimised conditions (280 °C, 20 MPa, rice straw concentration of 5 wt.% and agitation speed of 200 rpm) resulted in a reducing Sugar yield of 0.346 g/g rice straw because of the enhanced reducing Sugar Production and decreased Sugar degradation. The Sugar yield increased when the temperature increased from 250 °C to 280 °C, but it decreased when the temperature further increased to 300 °C because of the degradation of monosaccharides (e.g. glucose and xylose) into by-products (e.g. 2-methyltetrahydrofuran and acetic acid). A first-order reaction model was developed to elucidate the competitive reaction kinetics of Sugar Production and degradation at various temperatures. The highest reducing Sugar yield based on the model was achieved at 280 °C with the highest Production and lowest degradation rates.
Ari Pappinen - One of the best experts on this subject based on the ideXlab platform.
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enhanced Sugar Production from pretreated barley straw by additive xylanase and surfactants in enzymatic hydrolysis for acetone butanol ethanol fermentation
Bioresource Technology, 2015Co-Authors: Ming Yang, Junhua Zhang, Suvi Kuittinen, Jouko Vepsalainen, Pasi Soininen, Markku Keinanen, Ari PappinenAbstract:Abstract This study aims to improve enzymatic Sugar Production from dilute sulfuric acid-pretreated barley straw for acetone–butanol–ethanol (ABE) fermentation. The effects of additive xylanase and surfactants (polyethylene glycol [PEG] and Tween) in an enzymatic reaction system on straw hydrolysis yields were investigated. By combined application of 2 g/100 g dry-matter (DM) xylanase and PEG 4000, the glucose yield was increased from 53.2% to 86.9% and the xylose yield was increased from 36.2% to 70.2%, which were considerably higher than results obtained with xylanase or surfactant alone. The ABE fermentation of enzymatic hydrolysate produced 10.8 g/L ABE, in which 7.9 g/L was butanol. The enhanced Sugar Production increased the ABE yield from 93.8 to 135.0 g/kg pretreated straw. The combined application of xylanase and surfactants has a large potential to improve Sugar Production from barley straw pretreated with a mild acid and that the hydrolysate showed good fermentability in ABE Production.
