Organosolv pretreatment of wheat straw for efficient ethanol production using various solvents

Σαλάπα, Ιωάννα; Katsimpouras, Constantinos; Topakas, Evangelos; Sidiras, D.K.

doi:10.1016/j.biombioe.2017.03.011

Cited by 120 publications

(43 citation statements)

References 35 publications

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“…As one type of chemical pretreatment, the organosolv pretreatment method uses a variety of organic or aqueous solvents under catalytic or non-catalytic conditions. The solvents being used in the organosolv pretreatment include ethanol, methanol, acetone, formic acid, acetic acid, and glycerol [7,8]. In addition, acid catalysts such as sulfuric acid and hydrochloric acid are generally applied to lower the pH, because the carbohydrate-lignin complex efficiently cleaved at low pH.…”

Section: Introductionmentioning

confidence: 99%

Effects of Organosolv Pretreatment Using Temperature-Controlled Bench-Scale Ball Milling on Enzymatic Saccharification of Miscanthus × giganteus

Kim

Im²,

et al. 2018

Energies

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The effect of organosolv pretreatment was investigated using a 30 L bench-scale ball mill reactor that was capable of simultaneously performing physical and chemical pretreatment. Various reaction conditions were tried in order to discover the optimal conditions for the minimal cellulose loss and enhanced enzymatic digestibility of Miscanthus × giganteus (MG), with conditions varying from room temperature to 170 °C for reaction temperature, from 30 to 120 min of reaction time, from 30% to 60% ethanol concentration, and a liquid/solid ratio (L/S) of 10–20 under non-catalyst conditions. The pretreatment effects were evaluated by chemical compositional analysis, enzymatic digestibility test and X-ray diffraction of the treated samples. The pretreatment conditions for the highest glucan digestibility yield were determined as 170 °C, reaction time of 90 min, ethanol concentration of 40% and L/S = 10. With these pretreatment conditions, the XMG (xylan + mannan + galactan) fractionation yield and delignification were 84.4% and 53.2%, respectively. The glucan digestibility of treated MG after the aforementioned pretreatment conditions was 86.0% with 15 filter paper units (FPU) of cellulase (Cellic® CTec2) per g-glucan enzyme loading.

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Section: Introductionmentioning

confidence: 99%

Effects of Organosolv Pretreatment Using Temperature-Controlled Bench-Scale Ball Milling on Enzymatic Saccharification of Miscanthus × giganteus

Kim

Im²,

et al. 2018

Energies

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“…After ACWT pretreatment (200 • C, 0.0035 N SA concentration, 25 min), the carbon content increased to 52.51% (optimal conditions) and the oxygen decreased to 40.71%. Zanzi et al [48], Angles et al [40] and Iroba et al [49] obtained similar results from the ultimate analysis of the WT-treated lignocellulosic biomass feedstock. The C content of their steam-exploded samples increases while lignin condenses and carbonizes.…”

Section: Ultimate and Proximate Analysis Resultsmentioning

confidence: 60%

“…Combined increase in temperature, time and SA concentration leads to higher values of the CSF. Relevant research on straw pretreatment [40] shows that severe hydrolytic conditions leads to the degradation of cellulose and hemicelluloses, breaks the lignocellulosic matrix, decreases the ash content and changes the elemental composition of the modified material. In another relevant work, Angles et al [41] used the CSF (also called gravity factor) for the softwood vapor to logR 0 * = 4.6.…”

Section: Simulation Based On Csfmentioning

confidence: 99%

Acid-Catalyzed Wet Torrefaction for Enhancing the Heating Value of Barley Straw

et al. 2020

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In the present study, the possibility of improving the higher heating value (HHV) of lignocellulosic biomass, especially barley straw, was examined. The research deals with the treatment of barley straw by acid-catalyzed wet torrefaction (ACWT), also called acid hydrolysis, in a batch reactor (autoclave) Parr 4553 3.75 L. In this case, two different simulation approaches were applied: (i) combined severity factor (CSF) and (ii) response surface methodology (RSM) based on Box–Behnken design of experiments (DoE). Sulfuric acid (SA) concentration, temperature and time were the ACWT parameters examined herein. An oxygen bomb calorimeter was used for the HHV measurement. The findings indicated that the composition changes of the straw due to ACWT had a significant effect on the HHV of the pretreated material. In this study, treatment conditions were 10–35 mM SA, 160–200 °C and an isothermal reaction time 0–40 min (preheating period not included in these values). In conclusion, there was a significant increase in the HHV up to 24.3 MJ/kg for the ACWT barley straw, compared to 17.5 MJ/kg for the untreated straw, at optimal conditions of 200 °C for 25 min (isothermal period) and 35 mM SA. This resulted in a 1.39 enhancement factor (EF) and 68% energy yield (EY).

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“…In acid media, the delignification of lignin is preceded by cleavage of α-aryl-ether and β-arylether bonds by H + ions. The concentration of hydrogen ions increases with increasing ethanol concentration and liquid/solid ratio but decreases with increasing processing time [82]. Although the cleavage of α-aryl-ether linkages is a primary factor, the cleavage of β-aryl-ether links is also influential (especially with hardwood).…”

Section: Delignification Mechanismsmentioning

confidence: 99%

“…Overall, hardwood is easier to delignify than softwood by virtue of its lower content in lignin, higher concentration of α-aryl-ether links-which make it easier to hydrolyze, lower tendency to lignin condensation and higher reactivity of β-aryl-ether links [82].…”

Section: Delignification Mechanismsmentioning

confidence: 99%

Different Solvents for Organosolv Pulping

Rodríguez¹,

Espinosa²,

Domínguez-Robles³

et al. 2018

Pulp and Paper Processing

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Organosolv pulping is a two-stage process involving hydrolysis (decomposition of wood by use of a catalyst) and removal of lignin with an organic solvent (usually a mixture of alcohol and water). The main disadvantage of using an alcohol is its low boiling point, which requires operating at a high pressure and hence using special equipment that is expensive to purchase and operate. One solution to this problem is using alternative organic solvents that afford operation at pressure levels similar to those of classic pulping processes (e.g., the Kraft process). This chapter provides a comprehensive literature review on the organosolv-based production of cellulose pulp by using alternative solvents such as glycols, phenols, esters, organic acids, acetone and amines.

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Organosolv pretreatment of wheat straw for efficient ethanol production using various solvents

Cited by 120 publications

References 35 publications

Effects of Organosolv Pretreatment Using Temperature-Controlled Bench-Scale Ball Milling on Enzymatic Saccharification of Miscanthus × giganteus

Effects of Organosolv Pretreatment Using Temperature-Controlled Bench-Scale Ball Milling on Enzymatic Saccharification of Miscanthus × giganteus

Acid-Catalyzed Wet Torrefaction for Enhancing the Heating Value of Barley Straw

Different Solvents for Organosolv Pulping

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