Increase in ethanol production from sugarcane bagasse based on combined pretreatments and fed-batch enzymatic hydrolysis

Wanderley, Maria Carolina de Albuquerque; Martı́n, Carlos; Rocha, George Jackson de Moraes; Gouveia, Ester Ribeiro

doi:10.1016/j.biortech.2012.10.131

Cited by 122 publications

(44 citation statements)

References 23 publications

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“…The fed-batch operation enables operatation at solids loadings higher than 10% w/w while overcoming mixing constrains (Rosgaard et al, 2007;Wanderley et al, 2013;Zhao et al, 2013) and allows sugar concentrations up to four times greater than those of the equivalent batch reaction (Gupta et al, 2012). Two to four additions of solids have been reported and enzymes are added either all at the beginning of the reaction or at each solids feeding event (Gonzalez Quiroga et al, 2010-1).…”

Section: Introductionmentioning

confidence: 99%

Continuous and Semicontinuous Reaction Systems for High-Solids Enzymatic Hydrolysis of Lignocellulosics

Gonzalez‐Quiroga

Bula

Padilla

et al. 2015

Braz. J. Chem. Eng.

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-An attractive operation strategy for the enzymatic hydrolysis of lignocellulosics results from dividing the process into three stages with complementary goals: continuous enzyme adsorption at low-solids loading (5% w/w) with recycling of the liquid phase; continuous liquefaction at high-solids content (up to 20% w/w); and, finally, continuous or semicontinuous hydrolysis with supplementation of fresh enzymes. This paper presents a detailed modeling and simulation framework for the aforementioned operation strategies. The limiting micromixing situations of macrofluid and microfluid are used to predict conversions. The adsorption and liquefaction stages are modeled as a continuous stirred tank and a plug flow reactor, respectively. Two alternatives for the third stage are studied: a train of five cascading stirred tanks and a battery of batch reactors in parallel. Simulation results show that glucose concentrations greater than 100 g L -1 could be reached with both of the alternatives for the third stage.

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Section: Introductionmentioning

confidence: 99%

Continuous and Semicontinuous Reaction Systems for High-Solids Enzymatic Hydrolysis of Lignocellulosics

Gonzalez‐Quiroga

Bula

Padilla

et al. 2015

Braz. J. Chem. Eng.

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“…The reactor was heated with saturated steam. In order to quench the reaction at the end of the steaming, the pressure was instantaneously released and the sample was blown in the receiver (Rocha et al 2012;Wanderley et al 2013). A portion of the lignocellulose after steam explosion was stored at 4 °C for subsequent chemical analyses and SSF processes, and the liquid was reserved and pretreated with and without acid hydrolysis for the determination of sugars (mono-meric and oligomeric fraction) by HPLC.…”

Section: Pretreatment With Steam Explosion (Se)mentioning

confidence: 99%

“…The SCB was impregnated with 4% (v/v) concentrated sulfuric acid at a ratio of solid to liquid of 1:10 for 1 h. Then, steam explosion pretreatment was performed at 190 °C for 10 min and 210 °C for 5 min (Rocha et al 2012;Wanderley et al 2013) using the SCB with a final moisture content of 55 wt% in a high-pressure batch reactor (20 L) located at National Power Grid (Beijing). The reactor was heated with saturated steam.…”

Section: Pretreatment With Steam Explosion (Se)mentioning

confidence: 99%

“…The task of hydrolyzing lignocelluloses to fermentable monosaccharides is still a technical problem because the digestibility of cellulose is hindered by many physicochemical, structural, and compositional factors (Wanderley et al 2013). The natural cellulose is protected by the surrounding matrix of lignin, hemicelluloses, and pectin against enzymatic attacks, which makes it a challenging material for ethanol production.…”

Section: Introductionmentioning

confidence: 99%

“…Steam explosion is the most widely employed physico-chemical pretreatment for lignocellulosic biomass (Wanderley et al 2013). However, this pretreatment strategy used in saccharification has additional impacts on the efficiency of the enzymes and can also inhibit the growth of the fermenting microorganisms (Alvira et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Pretreatment Methods for Production of Ethanol from Sugarcane Bagasse

et al. 2016

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Sugarcane bagasse (SCB) was modified by steam explosion pretreatment at 190 °C for 10 min and 210 °C for 5 min using green liquor (GL) combined with hydrogen peroxide (GL-H2O2) and ethanol (GL-Ethanol) for simultaneous saccharification and fermentation (SSF)-based ethanol production. The results showed that 85.02% and 100% of hemicelluloses were solubilized by steam explosion pretreatment at 190 °C for 10 min and 210 °C for 5 min, respectively. Moreover, 20.08% and 73.77% of the lignin was removed through GL-H2O2 and GL-Ethanol pretreatments, respectively. The steam explosion pretreatments greatly improved the specific surface area of the SCB and led to the highest ethanol yield of 92.20% at 190 °C for 10 min and 93.19% of 210 °C for 5 min, respectively. In addition, the ethanol yield reached 72.58% for the GL-Ethanol pretreatment, and about 70% of active lignin could be recovered from the pretreatment liquid. When the GL-H2O2 pretreatment was used, the maximum ethanol yield of 20.92% was achieved.

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Radiocarbon Analysis for Biofuel Quantification in Fuel Blends

Culp

2017

Encyclopedia of Analytical Chemistry

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Fuel blends, particularly those composed of a mixture of biobase and fossil sources, are comparatively new in the energy marketplace relative to pure fossil fuels such as gasoline or pure biobase fuels such as sugarcane‐derived ethanol. A developing market exists for these blends of biobase and fossil fuels and accompanying this is the need for accurate assessment of each source's contribution in the mixture. In the United States, the Energy Independence and Security Act of 2007 mandates that specific levels of renewable fuel be established by 2022. Currently, this requirement is met by the 10% ethanol, derived primarily from corn, which is added to most gasoline sold in the United States. This mandate requires that the accurate determination of this addition of renewable fuel be provided. The well‐developed technology of radiocarbon dating, measuring the abundance of the 14 C atoms in a material, can determine the source material based on the abundance or absence of 14 C, similar to but distinct from age determination in radiocarbon dating. Relative to other analytical techniques, 14 C determination is the only one able to unambiguously determine a fossil‐fuel‐derived product. The use of radiocarbon, as a determinant of a biobase product, stems from the natural occurrence of 14 C in plants as a result of 14 CO 2 uptake during photosynthesis along with the far more abundant stable isotopes of carbon 13 CO 2 and 12 CO 2 . Once harvested, the biobase source material such as corn or sugarcane will no longer take up 14 CO 2 and will retain the majority of the 14 C absorbed with only a minor loss through the continuous process of radioactive decay. 14 C has a half‐life of 5730 years, the time required to halve the 14 C content, and becomes undetectable, or indiscernible from background activity, after approximately 10 half‐lives or 57 000 years. Carbon‐containing materials older than this have no measurable 14 C activity and are considered fossil in origin. This is a far shorter time than is required for the maturation of petroleum hydrocarbons or other fossil fuels so they are in essence at or below background 14 C activity by the nature of their long‐term formation. This paper discusses the use of 14 C and stable isotope of carbon to determine the mixing of biobase and fossil fuel‐derived materials.

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Increase in ethanol production from sugarcane bagasse based on combined pretreatments and fed-batch enzymatic hydrolysis

Cited by 122 publications

References 23 publications

Continuous and Semicontinuous Reaction Systems for High-Solids Enzymatic Hydrolysis of Lignocellulosics

Continuous and Semicontinuous Reaction Systems for High-Solids Enzymatic Hydrolysis of Lignocellulosics

Comparison of Pretreatment Methods for Production of Ethanol from Sugarcane Bagasse

Radiocarbon Analysis for Biofuel Quantification in Fuel Blends

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