Enzymatic Saccharification of Cellulosic Materials after Hydrothermolysis and Organosolv Pretreatments

Hörmeyer, H. F.; Bonn, Guenther K.; Kim, D. W.; Bobleter, O.

doi:10.1080/02773818708085267

Cited by 14 publications

(2 citation statements)

References 22 publications

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“…Weil et al also pretreated poplar under similar conditions and achieved 90 wt % digestibility, but only 55 wt % ethanol yield, possibly because of the 1-h heat-up times needed to reach temperatures above 200 °C. Hormeyer et al , also pretreated poplar with hot liquid water (210 °C, 30 min) and achieved only 40−50 wt % digestibility.…”

Section: Resultsmentioning

confidence: 99%

A Comparison of Aqueous and Dilute-Acid Single-Temperature Pretreatment of Yellow Poplar Sawdust

Allen¹,

Schulman²,

Lichwa³

et al. 2001

Ind. Eng. Chem. Res.

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Pretreatment of fresh yellow poplar sawdust (<6 mm, 25−30 wt % moisture) with hot liquid water (190−220 °C, 2.0−7.5 min, 2−7 wt % solids loading) or steam (220 °C, 2.0 min) was compared with dilute acid pretreatment (0.8% w/v sulfuric acid, 175 °C, 10 min, 20−25 wt % solids loading). The most favorable conditions for hot liquid water pretreatment (220 °C, 2.0 min, 5 wt % solids loading) performed as well as the dilute acid pretreatment (175 °C, 10.0 min, 0.8% sulfuric acid, 20 wt % solids loading) for fermentation of the cellulosic fraction of the pretreated fibers by simultaneous saccharification and fermentation (SSF), using Saccharomyces cerevisiae and 25 IFPU cellulase/g of cellulose. Ethanol yields of 97 and 92 wt % of the theoretical yield and xylan recoveries of 85 and 70 wt % (92 and 96 wt % solubilization) were achieved with the hot liquid water and dilute acid pretreatments, respectively. Steam pretreatment (220 °C, 2 min) was not as effective as the dilute acid pretreatment, resulting in an ethanol yield of 70 wt % of the theoretical yield, with 88 wt % xylan recovery (54 wt % solubilization). A positive correlation was found between xylan removal and the ethanol yield obtained by SSF. Xylan recovery, however, was inversely proportional to xylan solubilization. Removal of up to 57 wt % of the acid-insoluble lignin in yellow poplar was also possible with hot liquid water pretreatment, with 75 wt % of this acid-insoluble lignin recoverable by simple filtration of the liquid pretreatment products.

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Section: Resultsmentioning

confidence: 99%

A Comparison of Aqueous and Dilute-Acid Single-Temperature Pretreatment of Yellow Poplar Sawdust

Allen¹,

Schulman²,

Lichwa³

et al. 2001

Ind. Eng. Chem. Res.

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“…Organosolv pretreatment (e.g. ethanosolv) of wood chips has also been attempted in recent years to open the structure of wood chips, but was originally developed as a pulping technology . It can effectively process recalcitrant substrates and generate cellulose rich substrate that is ready for enzyme hydrolysis .…”

Section: Pretreatment Of Wood Chipsmentioning

confidence: 99%

Recent advancements in various steps of ethanol, butanol, and isobutanol productions from woody materials

Fatehi

2013

Biotechnology Progress

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In this review, the recent advancements and technical challenges associated with the production of ethanol, butanol, and isobutanol via bioconversion routes from celluloses of woody materials are reviewed. Physicochemical processes, e.g. steam explosion, seem to be the most viable process for pretreating woody materials. Although enzymatic hydrolysis is selective, it is rather a slow process. Acid hydrolysis is a relatively fast process with a high yield, but it produces inhibitory compounds of fermentation, which necessitates a detoxification process before the fermentation. Presently, the major challenges in the production of ethanol, butanol, and isobutanol via biological conversions are the rather low production yield and the sensitivity of microorganisms to the presence of inhibitors and products in fermentation media. In this study, the recent advancements in the applications of Saccharomyces cerevisiae, Clostridium acetobutylicum, and Corynebacterium glutamicum, the most promising microorganisms, for ethanol, butanol, and isobutanol production are also discussed.

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Conversion of Lignocellulosics Pretreated with Liquid Hot Water to Ethanol

Walsum

Allen

Spencer

et al. 1996

Seventeenth Symposium on Biotechnology for Fuels and Chemicals

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Enzymatic Saccharification of Cellulosic Materials after Hydrothermolysis and Organosolv Pretreatments

Cited by 14 publications

References 22 publications

A Comparison of Aqueous and Dilute-Acid Single-Temperature Pretreatment of Yellow Poplar Sawdust

A Comparison of Aqueous and Dilute-Acid Single-Temperature Pretreatment of Yellow Poplar Sawdust

Recent advancements in various steps of ethanol, butanol, and isobutanol productions from woody materials

Conversion of Lignocellulosics Pretreated with Liquid Hot Water to Ethanol

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