Improvement of the enzymatic hydrolysis of furfural residues by pretreatment with combined green liquor and ethanol organosolv

Yu, Hailong; Xing, Yang; Lei, Fuhou; Liu, Zhiping; Liu, Zuguang; Jiang, Jianxin

doi:10.1016/j.biortech.2014.05.111

Cited by 39 publications

(26 citation statements)

References 44 publications

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“…The ethanol concentration increased from 17.1 g/L to 36.2 g/L, when decreasing the CR/FR ratio from 1:5 to 2:1. It has been reported that FR contains more than 40% lignin (Yu et al 2014), and lignin is known to inhibit ethanol fermentation because of its invalid adsorption to cellulose (Sun et al 2011). The ethanol-yield profiles differed with different ratios of CR/FR; the highest ethanol yield reached 71.1% of the theoretical as CR:FR=2:1, whereas the yield went down to 45.2% of CR:FR = 1:5.…”

Section: Glucose Release From Cassava Residue By Different Enzymesmentioning

confidence: 89%

Enhanced Ethanol Production with Mixed Lignocellulosic Substrates from Commercial Furfural and Cassava Residues

Ji¹,

Yu²,

Liu³

et al. 2015

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Simultaneous saccharification and fermentation (SSF) is an attractive process configuration for bio-ethanol production. Further reductions in process cost of SSF are expected with the use of waste agricultural or industrial materials as feedstock. In the current study, two industrial lignocellulosic wastes, cassava residues (CR) and furfural residues (FR), were combined during SSF for ethanol production due to their value-added applications and positive environmental impacts. After CR were liquefied and saccharified, saccharification liquid was added to SSF of FR. The effect of substrate fractions was investigated in terms of ethanol yield, byproduct concentration and the number of yeast cells. Besides, a natural surfactant, Gleditsia saponin, was added to investigate the effect of FR lignin on SSF with 20% substrate concentration. The results showed that increasing the ratio of CR/FR improved the ethanol yield and that the ethanol yield was also increased gradually by increasing the substrate concentration from 6% to 12%. A high ethanol concentration of 36.0 g/L was obtained under the condition of CR:FR = 2:1 with 12% substrate concentration, reaching 71.1% of the theoretical yield. However, Gleditsia saponin did not affect the ethanol yield, indicating the insignificant effect of lignin in SSF with low lignin content in the reaction system.

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Section: Glucose Release From Cassava Residue By Different Enzymesmentioning

confidence: 89%

Enhanced Ethanol Production with Mixed Lignocellulosic Substrates from Commercial Furfural and Cassava Residues

Ji¹,

Yu²,

Liu³

et al. 2015

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“…Moreover, the high lignin content of FRs may cause non-productive adsorption to cellulase, which is not favorable for the hydrolysis stage in the SSF process (Kumar et al 2009(Kumar et al , 2012. To ultimately improve SSF of FRs, various pretreatment technologies, such as green liquor and hydrogen peroxide pretreatment, acidic bisulfite pretreatment, and green liquor combined with ethanol pretreatment, have been applied to eliminate the negative effect of lignin that results in the non-productive absorption of enzymes (Yu et al 2013(Yu et al , 2014Zheng et al 2015). However, these pretreatments required high energy and chemicals input, representing a considerable bottleneck in bioethanol production from FR (Keller et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Bioethanol Production Using a Blend of Furfural Production Residue and Tea-seed Cake

Zheng¹,

Xing²,

Zhou³

et al. 2016

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The price of raw material, energy demand in the pretreatment step, and enzyme usage rate are the major cost factors in the process of converting biomass to bioethanol. Unwashed furfural residues (FRs) possess great potential for application in bioethanol production. Surfactant addition is an effective method to enhance the fermentation rate. In this study, unwashed FRs were used directly as raw materials to produce bioethanol. Tea-seed cake (TSC), tea seed residues that contained protein and saponin, was added in the simultaneous saccharification and fermentation (SSF) process. The effect of TSC dosage on SSF was compared. TSC was added at the dosage of 10 g/L, which resulted in a final ethanol yield of 87.2%. However, a high concentration of TSC could induce cytotoxicity in yeast. The surface tension (approximately 33.92 mM/m) at SSF using TSC-medium was much lower than that of other fermentation systems (about 64.67 mN/m). Further contact angle testing showed that TSC-medium (21.7°) had better wetting capacity than FRs (45.6°). This study provided a proposed process strategy that SSF with the addition of TSC could be a minimum consumption of chemicals and enzymes for future cellulosic ethanol production process.

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“…GL-Ethanol pretreatment was carried out in a PTFE reactor with a total volume of 200 mL according to a previous optimization study (Yu et al 2014). Ten grams of dry sugarcane bagasse was pretreated by 1.5 mL /g-DS at 140 °C for 3 h with a solid/liquid ratio (w/v) of 1:10.…”

Section: Pretreatment Of Sugarcane Bagasse By Green Liquor Combined Wmentioning

confidence: 99%

“…Organosolv pretreatment is milder than organosolv pulping. Organosolv pretreatment has some typical advantages compared with other pretreatments: (1) the lignin degradation products can be applied in the fields of adhesives, films, and biodegradable polymers and other co-products; and (2) the organic solvents could be easily circulated by distillation (Mesa et al 2011;Yu et al 2014). Among these organosolv pretreatments, ethanol pretreatment is considered the preferable method because of its low toxicity and low boiling point, making it easily recovered by distillation.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the alkaline pretreatment methods are effective on certain types of material by increasing the available surface area, dissolving the lignin, and breaking the bonds between lignin and the carbohydrate polymers. However, alkaline pretreatment causes environmental pollution, especially through the release of waste water (Yu et al 2014). Organosolv pretreatment is milder than organosolv pulping.…”

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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Improvement of the enzymatic hydrolysis of furfural residues by pretreatment with combined green liquor and ethanol organosolv

Cited by 39 publications

References 44 publications

Enhanced Ethanol Production with Mixed Lignocellulosic Substrates from Commercial Furfural and Cassava Residues

Enhanced Ethanol Production with Mixed Lignocellulosic Substrates from Commercial Furfural and Cassava Residues

Enhancement of Bioethanol Production Using a Blend of Furfural Production Residue and Tea-seed Cake

Comparison of Pretreatment Methods for Production of Ethanol from Sugarcane Bagasse

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