Challenges and opportunities in improving the production of bio-ethanol

Baeyens, Jan; Kang, Qian; Appels, Lise; Dewil, Raf; Lv, Yongqin; Tan, Tianwei

doi:10.1016/j.pecs.2014.10.003

Cited by 502 publications

(239 citation statements)

References 154 publications

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“…The presaccharification performed in SSSF is important to supply glucose in concentrations high enough to activate the yeast at the beginning of fermentation (Santos et al 2010). Presaccharification improves ethanol yield and reduces enzyme inhibition (such as glucose and cellobiose in high concentration) and fermentation time (Gonçalves et al 2014;Baeyens et al 2015;Cotana et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal and Acid Pretreatments Improve Ethanol Production from Lignocellulosic Biomasses

2017

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a Hydrothermal and acid pretreatments using different acid charges (1.5%, 3.0%, and 4.5% H2SO4) were proposed for eucalyptus, sugarcane bagasse, and sugarcane straw prior to their bioconversion into ethanol using the semi-simultaneous saccharification and fermentation (SSSF) process. The hydrothermal and acid pretreatments were efficient for hemicelluloses removal from eucalyptus (63 to 96%), bagasse (25 to 98%), and straw (23 to 95%) and to remove a substantial amount of lignin from eucalyptus (10 to 34%) and bagasse (10 to 27%). During pretreatments, pseudo-extractives and pseudo-lignin were generated from biomasses. The SSSF was performed in pretreated biomasses using 24 h presaccharification followed by an additional 10 h of simultaneous saccharification and fermentation (SSF). With hydrothermal pretreatment, the eucalyptus presented the highest ethanol production, but only low values for SSSF parameters were obtained, as follows: ethanol yield ). On the other hand, using acid pretreatment, the straw (pretreated using 4.5% H2SO4) presented the highest ethanol production among the biomasses, assessed based on ethanol yield (0.056 gethanol/gbiomass), volumetric productivity of ethanol ).

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Section: Introductionmentioning

confidence: 99%

Hydrothermal and Acid Pretreatments Improve Ethanol Production from Lignocellulosic Biomasses

2017

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“…First and second generation bio-ethanol productions follow the same flowsheet, with extra steps involved for lignocellulosic feedstock. This is illustrated in Figure 1 [26], and discussed below.…”

Section: Introductionmentioning

confidence: 90%

“…Whereas other items remain about the same, except for item 18 where heat recovery is the distillation, the use of Very High Fermentation and the use of hydrophilic membranes to prepare anhydrous ethanol reduce the fuel consumption and equivalent CO 2 emissions to 50% of the corn-based example [26,73]. The CO 2 emissions decrease to about 70 g/MJ ethanol, a reduction of 42%.…”

Section: The Exergy-efficiency Of the Processmentioning

confidence: 99%

Exergy and CO2 Analyses as Key Tools for the Evaluation of Bio-Ethanol Production

Kang

Tan

2016

Sustainability

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Abstract:The background of bioethanol as an alternative to conventional fuels is analyzed with the aim of examining the efficiency of bioethanol production by first (sugar-based) and second (cellulose-based) generation processes. Energy integration is of paramount importance for a complete recovery of the processes' exergy potential. Based upon literature data and our own findings, exergy analysis is shown to be an important tool in analyzing integrated ethanol production from an efficiency and cost perspective.

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“…Storage and distribution, engine design, energy content, crop depletion, and landmass shortages are contributing to the maturity of bioethanol technology. [3][4][5] While ethanol has proven to be a successful industrial venture as a renewable fuel blend, nearly 90% of all energy consumed for transportation in the United States is still derived from fossil fuels. Three primary petroleum-derived fuels consumed for transportation are gasoline (56%), diesel (21%), and jet fuel (11%), and the higher carbon content within these fuels (C 4 -C 20 ) are more amenable for combustion engines than ethanol due to their higher energy density and lower hygroscopicity.…”

Section: Introductionmentioning

confidence: 99%

Metabolic Engineering for Advanced Biofuels Production and Recent Advances Toward Commercialization

Meadows

Kang

Lee

2017

Biotechnology Journal

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Research on renewable biofuels produced by microorganisms has enjoyed considerable advances in academic and industrial settings. As the renewable ethanol market approaches maturity, the demand is rising for the commercialization of more energy-dense fuel targets. Many strategies implemented in recent years have considerably increased the diversity and number of fuel targets that can be produced by microorganisms. Moreover, strain optimization for some of these fuel targets has ultimately led to their production at industrial scale. In this review, the recent metabolic engineering approaches for augmenting biofuel production derived from alcohols, isoprenoids, and fatty acids in several microorganisms are discussed. In addition, the successful commercialization ventures for each class of biofuel targets are discussed.

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Challenges and opportunities in improving the production of bio-ethanol

Cited by 502 publications

References 154 publications

Hydrothermal and Acid Pretreatments Improve Ethanol Production from Lignocellulosic Biomasses

Hydrothermal and Acid Pretreatments Improve Ethanol Production from Lignocellulosic Biomasses

Exergy and CO2 Analyses as Key Tools for the Evaluation of Bio-Ethanol Production

Metabolic Engineering for Advanced Biofuels Production and Recent Advances Toward Commercialization

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