Bioethanol production from oxalic acid-pretreated biomass and hemicellulose-rich hydrolysates via a combined detoxification process

Kundu, Chandan; Trinh, Ly Thi Phi; Lee, Hong-Joo; Lee, Jae Won

doi:10.1016/j.fuel.2015.08.045

Cited by 26 publications

(12 citation statements)

References 32 publications

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“…The increase in lignin content was the highest for the biomass treated with oxalic acid which also proved that more xylan was separated from the structure with oxalic acid treatment compared to maleic and succinic acid. The increase in lignin content was also reported in literature for the biomass treated with different organic acids . Similarly, the cellulose contents remaining in the pretreated biomass were also increased, compared with that of the untreated biomass.…”

Section: Resultssupporting

confidence: 85%

“…The increase in lignin content was also reported in literature for the biomass treated with different organic acids. 12,[21][22][23] Similarly, the cellulose contents remaining in the pretreated biomass were also increased, compared with that of the untreated biomass. The change in the amount of cellulose and lignin with xylan content could also be seen in Figure 1.…”

Section: Resultsmentioning

confidence: 93%

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Optimization of organic acid pretreatment of wheat straw

Barisik

İşçi

Kutlu

et al. 2016

Biotechnology Progress

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The objective of this study was to determine the effectiveness of different organic acids (maleic, succinic, and oxalic acid) on enzymatic hydrolysis and fermentation yields of wheat straw. It was also aimed to optimize the process conditions (temperature, acid concentration, and pretreatment time) by using response surface methodology (RSM). In line with this objective, the wheat straw samples were pretreated at three different temperatures (170, 190, and 210°C), acid concentrations (1%, 3%, and 5%) and pretreatment time (10, 20, and 30 min). The findings show that at extreme pretreatment conditions, xylose was solubilized in liquid phase, causing an increase in cellulose and lignin content of biomass. Enzymatic hydrolysis experiments revealed that maleic and oxalic acids were quite effective at achieving high sugar yields (>90%) from wheat straw. In contrast, the highest sugar yields were 50-60%, when the samples were pretreated with succinic acid, indicating that succinic acid was not as effective. The optimum process conditions for maleic acid were, 210°C, 1.08% acid concentration, and 19.8 min; for succinic acid 210°C, 5% acid concentration, and 30 min; for oxalic acid 210°C, 3.6% acid concentration, and 16.3 min. The ethanol yields obtained at optimum conditions were 80, 79, and 59% for maleic, oxalic and succinic acid, respectively. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:1487-1493, 2016.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 93%

Optimization of organic acid pretreatment of wheat straw

Barisik

İşçi

Kutlu

et al. 2016

Biotechnology Progress

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“…Some of the inhibitory compounds may be adsorbed on the surface of the wood sediments. It is possible to subject such a sediment to enzymatic hydrolysis and then perform the detoxification [74][75][76][77]. It is possible to rinse the sediment several times with, for example, water [44], for elution of the inhibitors.…”

Section: Influence Of the Alkaline Pre-treatment On Inhibitory Compoumentioning

confidence: 99%

Optimization of Saccharification Conditions of Lignocellulosic Biomass under Alkaline Pre-Treatment and Enzymatic Hydrolysis

et al. 2018

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Abstract:Pre-treatment is a significant step in the production of second-generation biofuels from waste lignocellulosic materials. Obtaining biofuels as a result of fermentation processes requires appropriate pre-treatment conditions ensuring the highest possible degree of saccharification of the feed material. An influence of the following process parameters were investigated for alkaline pre-treatment of Salix viminalis L.: catalyst concentration (NaOH), temperature, pre-treatment time and granulation. For this purpose, experiments were carried out in accordance to the Box-Behnken design for four factors. In the saccharification process of the pre-treated biomass, cellulolytic enzymes immobilized on diatomaceous earth were used. Based on the obtained results, a mathematical model for the optimal conditions of alkaline pre-treatment prediction is proposed. The optimal conditions of alkaline pre-treatment are established as follows: granulation 0.75 mm, catalyst concentration 7%, pre-treatment time 6 h and temperature 65 • C if the saccharification efficiency and cost analysis are considered. An influence of the optimized pre-treatment on both the chemical composition and structural changes for six various lignocellulosic materials (energetic willow, energetic poplar, beech, triticale, meadow grass, corncobs) was investigated. SEM images of raw and pre-treated biomass samples are included in order to follow the changes in the biomass structure during hydrolysis.

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“…The applied method of detoxification is effective and allows for the removal of phenolic compounds and furan derivatives from the hydrolysates, without the simultaneous loss of reducing sugars. Authors of [42] applied a XAD-4 sorbent polymer. As a result of detoxification with this method, 5-HMF was completely removed and the furfural concentration was reduced by about 6.5 times.…”

Section: Influence Of the Pre-treatment And Saccharification Conditiomentioning

confidence: 99%

Comparison and Optimization of Saccharification Conditions of Alkaline Pre-Treated Triticale Straw for Acid and Enzymatic Hydrolysis Followed by Ethanol Fermentation

et al. 2018

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This paper concerns the comparison of the efficiency of two-stage hydrolysis processes, i.e., alkaline pre-treatment and acid hydrolysis, as well as alkaline pre-treatment followed by enzymatic hydrolysis, carried out in order to obtain reducing sugars from triticale straw. For each of the analyzed systems, the optimization of the processing conditions was carried out with respect to the glucose yield. For the alkaline pre-treatment, an optimal catalyst concentration was selected for constant values of temperature and pre-treatment time. For enzymatic hydrolysis, optimal process time and concentration of the enzyme preparation were determined. For the acidic hydrolysis, performed with 85% phosphoric acid, the optimum temperature and hydrolysis time were determined. In the hydrolysates obtained after the two-stage treatment, the concentration of reducing sugars was determined using HPLC. The obtained hydrolysates were subjected to ethanol fermentation. The concentrations of fermentation inhibitors are given and their effects on the alcoholic fermentation efficiency are discussed.

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Bioethanol production from oxalic acid-pretreated biomass and hemicellulose-rich hydrolysates via a combined detoxification process

Cited by 26 publications

References 32 publications

Optimization of organic acid pretreatment of wheat straw

Optimization of organic acid pretreatment of wheat straw

Optimization of Saccharification Conditions of Lignocellulosic Biomass under Alkaline Pre-Treatment and Enzymatic Hydrolysis

Comparison and Optimization of Saccharification Conditions of Alkaline Pre-Treated Triticale Straw for Acid and Enzymatic Hydrolysis Followed by Ethanol Fermentation

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