Autohydrolysis: A promising pretreatment for the improvement of acetone, butanol, and ethanol production from woody materials

Amiri, Hamid; Karimi, Keikhosro

doi:10.1016/j.ces.2015.07.020

Cited by 48 publications

(25 citation statements)

References 30 publications

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“…Autohydrolysis has a wide range of applications, like pulping processes, defibration for fibreboard production and as a pretreatment for the enzymatic hydrolysis of cellulose (Garrote et al 1999). It has been employed as a pretreatment for agriculture and food wastes, like corn stover or coconut shell in ethanol fermentation processes (Buruiana et al 2014, Gonçalves et al 2015, or pine and elm wood in ABE fermentation processes (Amiri and Karimi 2015). Dilute chemical pretreatments consist of the use of an aqueous solution containing a chemical reagent which can improve the degradation or hydrolysis of lignocellulosic biomass.…”

Section: Introductionmentioning

confidence: 99%

Biobutanol production from apple pomace: the importance of pretreatment methods on the fermentability of lignocellulosic agro-food wastes

Hijosa‐Valsero

Paniagua-García

Díez-Antolínez

2017

Appl Microbiol Biotechnol

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Apple pomace was studied as a possible raw material for biobutanol production. Five different soft physicochemical pretreatments (autohydrolysis, acids, alkalis, organic solvents and surfactants) were compared in a high-pressure reactor, whose working parameters (temperature, time and reagent concentration) were optimised to maximise the amount of simple sugars released and to minimise inhibitor generation. The pretreated biomass was subsequently subjected to a conventional enzymatic treatment to complete the hydrolysis. A thermal analysis (DSC) of the solid biomass indicated that lignin was mainly degraded during the enzymatic treatment. The hydrolysate obtained with the surfactant polyethylene glycol 6000 (PEG 6000) (1.96% w/w) contained less inhibitors than any other pretreatment, yet providing 42 g/L sugars at relatively mild conditions (100 °C, 5 min), and was readily fermented by Clostridium beijerinckii CECT 508 in 96 h (3.55 g/L acetone, 9.11 g/L butanol, 0.26 g/L ethanol; 0.276 g/g yield; 91% sugar consumption). Therefore, it is possible to optimise pretreatment conditions of lignocellulosic apple pomace to reduce inhibitor concentrations in the final hydrolysate and perform successful ABE fermentations without the need of a detoxification stage.

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Section: Introductionmentioning

confidence: 99%

Biobutanol production from apple pomace: the importance of pretreatment methods on the fermentability of lignocellulosic agro-food wastes

Hijosa‐Valsero

Paniagua-García

Díez-Antolínez

2017

Appl Microbiol Biotechnol

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“…Autohydrolysis is also a cost effective process, as the variation of pH in the liquors is very low and there is no corrosion of the equipment [18,19]. In literature there are several examples of this process, performed with different biomass crops and residues.…”

Section: Introductionmentioning

confidence: 99%

Optimal conditions for hemicelluloses extraction from Eucalyptus globulus wood: hydrothermal treatment in a semi-continuous reactor

Gallina

Cabeza

Biasi

et al. 2016

Fuel Processing Technology

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Optimal conditions for hemicellulose extraction from wooden biomass in a semi-continuous system have been assessed in this work. This study would constitute the first stage for a profitable and green industrial process. Eucalyptus globulus was selected as raw material due to its low water consumption, high growth and its efficiency in lignocellulose production. Moreover its cultivation is very popular in southern Europe. Samples of 5.0 g of wood were fractioned using a pressurized hot water semicontinuous system, to produce sugars (pentoses and hexoses) and a solid residue enriched in lignin.Five flow rates between 2.50 and 20.00 mL/min and four temperatures between 135.0 and 285.0 ºC were tested in order to maximize the production of sugars, avoiding the formation of degradation products.Optimum conditions for the extraction of hemicellulose were identified at 185.0 ºC and 5.00 mL/min, leading to a pentoses yield of 67.409 wt%, with 0.702 wt% of degradation products. Almost all the pulp is extracted at 285.0 ºC. SEM images show very well the changes in the wood structure at different temperatures.A kinetic model was developed, describing the extraction and hydrolysis of hemicellulose and cellulose with absolute average deviations around 10 % for sugar extracted mass.

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“…This elm clone showed similar amounts of carbohydrates and lignin as compared to other typical woody materials used for sugar production such as poplar and eucalypt [18,19] and several non-woody resources. [20] When this "Ademuz" clone is compared with other elm clones analyzed in literature, [21,22] nearly the same cellulose content but lower amounts of hemicelullosic sugars (mainly xylose) and acid insoluble lignin could be observed. It is well-known that the proportion of sugars and lignin may vary among different raw materials of the same specie depending on the growth conditions (salinity, water, and fertilizer), development state, and tissue type.…”

Section: Effects Of the Pretreatments On The Composition Of The Resulmentioning

confidence: 80%

Biorefinery of Lignocellulosic Biomass from an Elm Clone: Production of Fermentable Sugars and Lignin‐Derived Biochar for Energy and Environmental Applications

et al. 2018

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Valorization of lignocellulosic feedstock from a Dutch elm disease tolerant Ulmus minor clone was studied as a new biomass resource. Herein, fermentable sugars and activated carbons from the side‐stream lignins were produced. For the sugar extraction organosolv and acid hydrolysis pretreatments prior to enzymatic hydrolysis were compared for the first time for this clone prior to enzymatic hydrolysis; organosolv was more efficient for delignification (49 %), while acid hydrolysis was more efficient at eliminating hemicelluloses (95 %). A high final glucose concentration of 22–23.5 g L−1 was obtained after enzymatic hydrolysis suggesting that this clone can be considered a potential source for glucose‐based biofuel production. The side‐stream lignins were converted to microporous biochars of high surface area (1220 m2 g−1) and micropore volume (0.42 cm3 g−1). These biochars exhibited excellent properties as electrodes in supercapacitors with a specific capacitance of 118 F g−1 and a high energy density of 14 Wh kg−1 at 7000 W kg−1, while they were also efficient adsorbents in water remediation of model contaminants.

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Autohydrolysis: A promising pretreatment for the improvement of acetone, butanol, and ethanol production from woody materials

Cited by 48 publications

References 30 publications

Biobutanol production from apple pomace: the importance of pretreatment methods on the fermentability of lignocellulosic agro-food wastes

Biobutanol production from apple pomace: the importance of pretreatment methods on the fermentability of lignocellulosic agro-food wastes

Optimal conditions for hemicelluloses extraction from Eucalyptus globulus wood: hydrothermal treatment in a semi-continuous reactor

Biorefinery of Lignocellulosic Biomass from an Elm Clone: Production of Fermentable Sugars and Lignin‐Derived Biochar for Energy and Environmental Applications

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