Production of ethanol from carbohydrates from loblolly pine: A technical and economic assessment

Frederick, W.J.; Lien, Steven J.; Courchene, Charles E.; DeMartini, Nikolai; Ragauskas, Arthur J.; Iisa, Kristiina

doi:10.1016/j.biortech.2007.08.086

Cited by 76 publications

(31 citation statements)

References 7 publications

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“…The overall fermentable sugar available by acid hydrolysis may be 90 % of the theoretical value of the sugar present in cellulosic biomass [14,15]. Dilute acid processes are conducted under high temperatures of 120 to 200°C and high pressures of 15 psi to 75 psi, and have reaction times in the range of 30 min to 2 h by continuous processes [2,4].…”

Section: Acid Hydrolysismentioning

confidence: 99%

Recent Advances in Production of Bioethanol from Lignocellulosic Biomass

et al. 2009

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Ethanol is considered the most potential next generation automotive fuel because it is carbon-neutral and could be produced from renewable resources like lignocellulosic biomass. There are some technological barriers such as pretreatment, saccharification of cellulose and hemicellulose matrix, and simultaneous fermentation of hexose and pentose sugars which needs to be addressed for efficient conversion of lignocellulosic biomass to bioethanol. This paper reviews the various process options and kinetic models adopted towards resolving the technological challenges to develop a low-cost commercial process.

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Section: Acid Hydrolysismentioning

confidence: 99%

Recent Advances in Production of Bioethanol from Lignocellulosic Biomass

et al. 2009

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“…Ethanol production from wood pretreated by auto-hydrolysis or with 1% sulfuric acid followed by enzymatic hydrolysis and fermentation was reported in the range of 202-240 L/ton of wood. 31,33 Ethanol produced from loblolly pine appeared with competitive value with ethanol produced from corn or other lignocellulosic biomass (258-388 L/ton of wood). 34 For P. abies pretreated by steam explosion with SO 2 at 215°C for 5 min and SSF with Novozym 188 beta-glucosidase 28 IU/g cellulose and Celluclast of 32 FPU/g cellulose and using 5% of substrate consistency a maximum ethanol yield 68% of the theoretical based was reported.…”

Section: Immobilization Of S Cerevisiae In Calcium Alginatementioning

confidence: 99%

Diluted Acid Pretreatment of Pinus Radiata for Bioethanol Production Using Immobilized Saccharomyces Cerevisiae Ir2-9 in a Simultaneous Saccharification and Fermentation Process

Franco¹,

Mendonça²,

Marcato

et al. 2011

J. Chil. Chem. Soc.

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The production of bioethanol from pretreated lignocellulosic materials requires the utilization of microorganisms adapted to ferment the materials in conditions were high consistency, temperatures and inhibitors concentrations were commonly found. The yeast immobilization in calcium alginate capsules has been reported to enhance the yeast protection and increase the efficiency in the fermentation process. In this work, it was investigated the use Saccharomyces cerevisiae immobilized in calcium alginate and its performance in simultaneous saccharification and fermentation (SSF) of diluted-acid-pretreated Pinus radiata. Results showed that when immobilized yeast was used, the bioethanol yield from pretreated wood was higher than with free yeast cells during a SSF process. Maximum ethanol yield obtained from the acid pretreated and milled wood chips was 153 L/ton wood, while from the hydrolysate fraction it was 18 L/ton wood. The sum of ethanol produced from dilute acid pretreated P. radiata for both solid and liquid fractions was 171 L ethanol/ton wood from a maximum theoretical of 236 L/ ton pretretated wood (or 72% of conversion).

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“…Extensive research efforts are ongoing in order to identify the optimal pretreatment conditions for softwood and other biomass feedstock for efficient conversion to biofuels [2,29,30,33,[36][37][38][39][40][41]. The optimal conditions for the two-step dilute sulfuric acid pretreatment for softwoods have been investigated in several studies [17,30,36,37,40].…”

Section: Introductionmentioning

confidence: 99%

Effects of Two-Stage Dilute Acid Pretreatment on the Structure and Composition of Lignin and Cellulose in Loblolly Pine

2008

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A standard two-step dilute sulfuric acid pretreatment was performed on Loblolly pine to enhance the overall efficiency of enzymatic deconstruction of woody biomass to monomeric sugars. The structure of milled wood lignin and cellulose isolated from the untreated and acid-treated biomass was studied in detail. Solid-state 13 C NMR spectroscopy coupled with line shape analyses has been employed to elucidate cellulose crystallinity and ultrastructure. The results indicate an increase in the degree of crystallinity and reduced relative proportion of less ordered cellulose allomorphs following the acid pretreatment. This increase was attributed to a preferential degradation of amorphous cellulose and less ordered crystalline forms during the high temperature pretreatment. Milled wood lignin structural elucidation by quantitative 13 C and 31 P NMR reveals an increase in the degree of condensation of lignin due to the pretreatment. The increase in degree of condensation is accompanied by a decrease in β-O-4 linkages which were fragmented and recondensed during the high temperature acid-catalyzed reactions.

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Production of ethanol from carbohydrates from loblolly pine: A technical and economic assessment

Cited by 76 publications

References 7 publications

Recent Advances in Production of Bioethanol from Lignocellulosic Biomass

Recent Advances in Production of Bioethanol from Lignocellulosic Biomass

Diluted Acid Pretreatment of Pinus Radiata for Bioethanol Production Using Immobilized Saccharomyces Cerevisiae Ir2-9 in a Simultaneous Saccharification and Fermentation Process

Effects of Two-Stage Dilute Acid Pretreatment on the Structure and Composition of Lignin and Cellulose in Loblolly Pine

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