Ethanol Production from Sugarcane Bagasse Using Phosphoric Acid-Catalyzed Steam Explosion

Pitarelo, Ana Paula; Fonseca, César; Chiarello, Luana Marcele; Gı́rio, Francisco M.; Ramos, Luiz Pereira

doi:10.5935/0103-5053.20160075

Cited by 15 publications

(17 citation statements)

References 20 publications

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“…The steam explosion experiments were performed under pre-optimized conditions to recover most of the three main biomass components and to increase the susceptibility of the resulting substrate to enzymatic hydrolysis and fermentation. These conditions correspond to autohydrolysis at 195 °C for 7.5 min for sugarcane bagasse [49] and 210 °C for 5 min for eucalypt chips (unpublished data). The severity factor (log R O ) of these pretreatment conditions was calculated according to Overend e Chornet [50], where T (°C) is temperature and t (min) is residence time in the reactor (Eq.…”

Section: Pretreatment By Steam Explosionmentioning

confidence: 99%

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Chiarello

Ramos

Neves

et al. 2016

Sustain Chem Process

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Cellulosic ethanol is one of the most important biotechnological products to mitigate the consumption of fossil fuels and to increase the use of renewable resources for fuels and chemicals. By performing this process at high total solids (TS) and low enzyme loadings (EL), one can achieve significant improvements in the overall cellulosic ethanol production process. In this work, steam-exploded materials were obtained from Eucalyptus urograndis chips and sugarcane bagasse to be subsequently used for enzymatic hydrolysis at high TS (20 wt%) and relatively low EL (13.3 FPU g −1 TS of Cellic CTec3 from Novozymes). Also, the fermentability of their corresponding hydrolysates was tested using an industrial strain of Saccharomyces cerevisiae (Thermosacc Dry from Lallemand). Enzymatic hydrolysis of steam-treated E. urograndis reached 125 g L −1 of glucose in 72 h, while steam-treated bagasse gave yields 25 % lower. Both substrate hydrolysates were easily converted to ethanol, giving yields above 25 g L −1 and productivities of 2.3 g L −1 h −1 for eucalypt and 2.2 g L −1 h −1 for bagasse after only 12 h of fermentation. Under the conditions used in this study, sugarcane bagasse glucans showed the potential to boost the ethanol production from sugarcane culms by 31 %, from the 80 L t −1 of first generation to a total production of 105 L t −1. On the other hand, E. urograndis plantations are able to achieve cellulosic ethanol productivities of 2832.2 L ha −1 year −1 , which was 57.8 % higher than the projected value of 1794.5 L ha −1 year −1 that was obtained for sugarcane bagasse.

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Section: Pretreatment By Steam Explosionmentioning

confidence: 99%

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Chiarello

Ramos

Neves

et al. 2016

Sustain Chem Process

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“…Another study obtained 73.4 g l −1 glucose-rich solution in the secondstage of hydrolysis by using 40% acid concentration at 80 °C [14]. Reference [15] also obtained a high glucose yield at 180˚C after 5mins reaction time. These result generally agrees with the fact that high sugar yield will be obtained at high acid concentration, low temperature and reduced reaction time or low acid concentration, high temperature and reduced reaction time.…”

Section: Effect Of Process Parameters On Hydrolysis Of Cowpea Hullmentioning

confidence: 99%

Dilute Acid Hydrolysis of Cowpea Hulls: A Kinetic Study

Onyelucheya

Nwabanne

Onyelucheya

et al. 2016

International Journal on Advanced Science, Engineering and Information Technology

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In this study, dilute acid hydrolysis of cowpea hulls was carried out in two stages under the following conditions: prehydrolysis (4%v/v H 2 SO 4 , 121˚C, 30 minutes) and hydrolysis (at 10% and 15% v/v H 2 SO 4 ,varied at different temperatures 150 o C, 160 o C, 170 o C and 180 o C for 2.5 hrs.). The substrate was characterized using both Fourier transform infrared spectroscopy and proximate analysis. The percentage lignocellulosic composition of the substrate was obtained for cellulose, hemicellulose and lignin as 34%, 14% and 4.7% respectively. Maximum glucose concentration of 8.09g was obtained using 10%v/v acid concentration at 170˚C after a reaction time of 90min. Saeman's model gave a good fit for the experimental data. Activation energy for glucose formation using 10%v/v and 15%v/v H 2 SO 4 was obtained as 38.28KJ and 82.204KJ respectively. From the results obtained it can be concluded that cowpea hulls can be converted to a useful product.

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“…Results obtained on sugarcane bagasse through a central composite design comparing steam explosion carried out in the absence (autohydrolysis) and presence of phosphoric acid showed that phosphoric acid catalysis (19 mg g −1 ) resulted in better glucan yields under milder conditions (180°C, 5 min) [56]. Phosphoric acid catalysis produced steam-treated substrates with good susceptibility to enzymatic hydrolysis (30 mg g −1 Cellic ® CTec2, at 8% of substrate consistency) yielding in average 75% of glucose.…”

Section: Thermopressurized Aqueous Phosphoric Acid Pretreatment For Pmentioning

confidence: 99%

Sugar Versatility—Chemical and Bioprocessing of Many Phytobiomass Polysaccharides Using a Milder Hydrolytic Catalyst: Diluted Thermopressurized Phosphoric Acid

Fontana¹,

Couto²,

Wielewski³

et al. 2018

Sugarcane - Technology and Research

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Phytobiomasses, given the qualitative and quantitative dominance of polysaccharides, are a dominant wealth available in nature. Cellulose and hemicelluloses from softwoods, hardwoods and grasses, starch from tubercles and roots, pectins from fruits and gums from some seeds may be explored as such or following acid or alkaline pretreatments as well enzymatic deconstruction, and even simple chemical derivatization toward more added-value products. A general view in the chemistry of these valuable polymers is here broached, following a sharper focus on acid pretreatments for L(h)C-ligno(hemi) cellulosic materials from sugarcane and other feedstocks. Our particular experience using a gentler proton donor but keeping very advantageous aspects for polysaccharide chemo/biotechnological processing-thermopressurized diluted phosphoric acid (oPA)-is presented with a more detailed description as a result of its validity for the hydrolytic deconstruction of hemicelluloses-heteroxylans and heteromannans, cassava starch, dahlia inulin and mixed glucans from microalgae cell walls. The opportunity of NOs-nutraceutical oligosacchrides-generation from these particular glycopolymers is also shortly commented.

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Ethanol Production from Sugarcane Bagasse Using Phosphoric Acid-Catalyzed Steam Explosion

Cited by 15 publications

References 20 publications

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Dilute Acid Hydrolysis of Cowpea Hulls: A Kinetic Study

Sugar Versatility—Chemical and Bioprocessing of Many Phytobiomass Polysaccharides Using a Milder Hydrolytic Catalyst: Diluted Thermopressurized Phosphoric Acid

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