Optimization of alkali-extrusion pretreatment with twin-screw for bioethanol production from Miscanthus

Kang, Kyoung Ho; Han, Minhee; Moon, Se-Kwon; Kang, Hyun-Woo; Kim, Yule; Cha, Young-Lok; Choi, Gi-Wook

doi:10.1016/j.fuel.2013.03.026

Cited by 54 publications

(21 citation statements)

References 27 publications

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“…About 78% of the original polysaccharides were converted into fermentable sugars. Kang et al; 61 investigated the production of bioethanol from Miscanthus using a specially designed twin-screw extruder with sodium hydroxide. The pretreatment parameters were optimized using a response surface methodology.…”

Section: Twin Screw Extrusion Processmentioning

confidence: 99%

Mechanical pretreatments of lignocellulosic biomass: towards facile and environmentally sound technologies for biofuels production

et al. 2014

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The transformation of lignocellulosic biomass into biofuels represents an interesting and sustainable alternative to fossil fuel for the near future. However, one still faces some major challenges for the technology to be fully realized including feedstock costs, novel pretreatment processes, production, transportation, and environmental impact of the full chain. The development of new technologies focused to increase the efficiency of cellulose conversion to biofuels determines successful implementation. Mechanical fractionation is an essential step in order to increase final carbohydrate output, appropriate particle sizes and densification, enzymatic accessibility, and bioconversion affectivity without the production of toxic side streams. In this review article, we surveyed a substantial amount of previous work in mechanical fractionation or pretreatments of a variety of lignocellulosic biomasses; these include numerous milling schemes and extrusions, and their impacts on the physical and physicochemical properties of the lignocellulosic matrix (crystallinity, surface area, particle size, etc). We have also compared results with other pure chemical and physicochemical pretreatments in order to show the new aspects and advantages/disadvantages of such an approach. Last, but not least, the effec

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Section: Twin Screw Extrusion Processmentioning

confidence: 99%

Mechanical pretreatments of lignocellulosic biomass: towards facile and environmentally sound technologies for biofuels production

et al. 2014

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“…The different extrusion parameters must be taken into account to achieve the highest efficiency in the process. Recent extrusion studies showed a significant improvement on sugar recovery from corn stover (Liu et al, 2013), switchgrass (Karunanity and Muthukumarappan, 2010), Miscanthus (Kang et al, 2013), prairie cord grass (Karunanity and Muthukumarappan, 2010), pine wood (Karunanithy et al, 2012), and barley straw (Duque et al, 2013) through enzymatic hydrolysis. This improvement is attributed to the reduction in cellulose crystallinity, increase in surface area, pore size and volume (Karunanithy and Muthukumarappan, 2013), and the delignification effect during dissolution-regeneration steps (Um et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Alkaline twin-screw extrusion fractionation of olive-tree pruning biomass

Negro¹,

Duque²,

Manzanares³

et al. 2015

Industrial Crops and Products

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“…A wide number of technologies have been proposed for fractionation of LCMs in aqueous alkali and acid media, or mechanical pretreatments to improve the enzymatic accessibility [6][7][8]. In this context, hydrothermal treatment or alternative also known autohydrolysis or liquid hot compressed water is a possible pretreatment to biomass processing that yields a liquid phase (hydrolysate) composed by hemicellulose derivedcompounds (mainly oligosaccharides and monosaccharides) and solid phase enriched in cellulose and lignin [9].…”

Section: Introductionmentioning

confidence: 99%

Integrated approach for effective bioethanol production using whole slurry from autohydrolyzed Eucalyptus globulus wood at high-solid loadings

Romaní

Ruiz

Pereira

et al. 2014

Fuel

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h i g h l i g h t sIntegrated process optimization was evaluated for 2G bioethanol production. Enzymatic saccharification of whole-slurry from pretreatment was optimized. Two strategies with/without presaccharification to ethanol production were compared. Optimized conditions lead ethanol titer >6% using industrial yeast strain by SSF. Effective bioethanol production from whole slurry E. globulus was achieved. a b s t r a c tOne of the most important targets and challenges in the second generation bioethanol is the development of a cost-effective process on large-scale. In this context, the high solid loading on saccharification and fermentation and the use of whole-slurry from pretreatment could be promising alternatives to obtain high ethanol concentrations and to decrease operational costs and wastewater. In this work, Eucalyptus globulus wood was submitted to non-isothermal autohydrolysis treatment (T max = 210°C) and the whole-slurry obtained was assayed for the optimization of enzymatic saccharification at different solid and enzymes (CTec2 and HTec2) loadings using a Box-Behnken experimental design. Under the optimized conditions (liquid solid ratio 6.4 g/g, cellulase to substrate ratio 22.5 FPU/g and hemicellulase to substrate ratio 500 UI/g), two strategies were evaluated for ethanol production (Simultaneous Saccharification and Fermentation, SSF and Presaccharification and Simultaneous Saccharification and Fermentation, PSSF), using an industrial and robust Saccharomyces cerevisiae strain. High concentrations of ethanol (50.2 and 48.8 g/L) and productivities (0.63 and 0.55 g/L h) were obtained by SSF and PSSF, respectively. The SSF process proved to be an advantageous strategy to obtain concentrations >6% (v/v) of ethanol with elevated conversion (95%) even employing high solid loading and non-detoxified hydrolysate. Following an integrated optimization process, cost-effective bioethanol production conditions from whole-slurry E. globulus wood were determined and validated experimentally, representing a step-forward towards its industrial implementation.

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Optimization of alkali-extrusion pretreatment with twin-screw for bioethanol production from Miscanthus

Cited by 54 publications

References 27 publications

Mechanical pretreatments of lignocellulosic biomass: towards facile and environmentally sound technologies for biofuels production

Mechanical pretreatments of lignocellulosic biomass: towards facile and environmentally sound technologies for biofuels production

Alkaline twin-screw extrusion fractionation of olive-tree pruning biomass

Integrated approach for effective bioethanol production using whole slurry from autohydrolyzed Eucalyptus globulus wood at high-solid loadings

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