Comparison of yellow poplar pretreatment between NREL digester and sunds hydrolyzer

Tucker, Melvin P.; Farmer, J. D.; Keller, Fred A.; Schell, Daniel J.; Nguyan, Q. A.

doi:10.1007/bf02920121

Cited by 34 publications

(15 citation statements)

References 5 publications

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“…be fermented by LY01 after a simple fivefold dilution and neutralization. Undiluted hydrolysate with sugar concentrations of 100-120 g/L also contain 2-5 g of soluble aromatic compounds (aldehydes, acids, and alcohols) and 8-12 g/L of acetic acid from acetyl xylan (Fenske et al, 1998;Larsson et al, 1999;Tucker et al, 1998). Assuming an average hydrophobicity equivalent to a Log P octanol/water of 1.0 (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…These include acetic acid from acetyl-xylan hydrolysis, furfural and hydroxymethylfurfural from the dehydration of pentose and hexose sugars, and soluble aromatic compounds derived from lignin (McMillan, 1994;Palmqvist, 1998). Depending on the severity of reaction conditions, syrups can contain over 5 g/L of soluble aromatics (Fenske et al, 1998;Larsson et al, 1999;Tucker et al, 1998). Aromatic alcohols are a significant fraction of the lignin products and include catechol and hydroquinone (Palmqvist, 1998), coniferyl and guaiacol (Buchert et al, 1990), 4-methylcatechol (Popoff and Theander, 1976), vanillyl alcohol (Nishikawa et al, 1988), and others.…”

Section: Introductionmentioning

confidence: 99%

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Effect of alcohol compounds found in hemicellulose hydrolysate on the growth and fermentation of ethanologenic Escherichia coli

Zaldivar¹,

Martı́nez²,

Ingram³

2000

Biotechnol. Bioeng.

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Lignocellulose can be readily hydrolyzed into a mixture of sugars using dilute mineral acids. During hydrolysis, a variety of inhibitors are also produced which include aromatic alcohols from lignin and furfuryl alcohol from pentose destruction. Seven compounds were investigated individually and in binary combinations (catechol, coniferyl alcohol, furfuryl alcohol, guaiacol, hydroquinone, methylcatechol, and vanillyl alcohol). Aromatic alcohols and furfuryl alcohol inhibited ethanol production from xylose in batch fermentations primarily by inhibiting the growth of Escherichia coli LY01, the biocatalyst. The toxicities of these compounds were directly related to their hydrophobicity. Methylcatechol was the most toxic compound tested (MIC = 1.5 g/L). In binary combination, the extent of growth inhibition was roughly additive for most compounds tested. However, combinations with furfuryl alcohol and furfural (furaldehyde) appear synergistic in toxicity. When compared individually, alcohol components which are formed during hemicellulose hydrolysis are less toxic for growth than the aldehydes and organic acids either on a weight basis or a molar basis.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of alcohol compounds found in hemicellulose hydrolysate on the growth and fermentation of ethanologenic Escherichia coli

Zaldivar¹,

Martı́nez²,

Ingram³

2000

Biotechnol. Bioeng.

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“…Corn stover was pretreated with dilute sulfuric acid in an engineering-scale countercurrent pretreatment reactor system, a 200 kg dry biomass/ day capacity Sunds hydrolyzer (Metso Paper USA Inc., Norcross, GA) using 1.4% acid concentration, 8-min residence time, and 190°C temperature. The details of the hydrolyzer setup and operation are described by Nguyen et al (43) and Tucker et al (44). The pretreated corn stover slurry was separated into liquor and solid fractions, and the solid fraction was washed (45) and used in the experiments.…”

Section: Methodsmentioning

confidence: 99%

Development and Validation of a Kinetic Model for Enzymatic Saccharification of Lignocellulosic Biomass

2004

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A multireaction kinetic model was developed for closed-system enzymatic hydrolysis of lignocellulosic biomass such as corn stover. Three hydrolysis reactions were modeled, two heterogeneous reactions for cellulose breakdown to cellobiose and glucose and one homogeneous reaction for hydrolyzing cellobiose to glucose. Cellulase adsorption onto pretreated lignocellulose was modeled via a Langmuir-type isotherm. The sugar products of cellulose hydrolysis, cellobiose and glucose, as well as xylose, the dominant sugar prevalent in most hemicellulose hydrolyzates, were assumed to competitively inhibit the enzymatic hydrolysis reactions. Model parameters were estimated from experimental data generated using dilute acid pretreated corn stover as the substrate. The model performed well in predicting cellulose hydrolysis trends at experimental conditions both inside and outside the design space used for parameter estimation and can be used for in silico process optimization.

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“…Therefore, sawdust has been considered to be a potential feedstock for producing bio‐based products. However, most work on sawdust has been concentrated on hardwood that is relatively easy to hydrolyze in comparison with softwood 19, 20. Accordingly, there have not been many reports on the hydrolysis of softwood sawdust due to its high content of lignin compared with hardwood sawdust.…”

Section: Introductionmentioning

confidence: 99%

Two‐stage dilute acid‐catalyzed hydrolytic conversion of softwood sawdust into sugars fermentable by ethanologenic microorganisms

Kim¹

2005

J Sci Food Agric

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Softwood hemlock residues generated in a sawmill were tested as a feasible agricultural feedstock for the production of high-value bio-based products using the concept of two-stage dilute acid hydrolysis. To convert the carbohydrate contained in the hemlock sawdust, two-stage dilute-acid catalyzed hydrolysis was conducted. In the first stage, sawdust was hydrolyzed at 190 • C for 150 s with 1.1wt% sulfuric acid and 46.0 wt% total solids. As a result, 69.3% mannose, 74.2% galactose, 67.7% xylose, and 17.4% glucose of their theoretical maximum yields were achieved, which reveals that hemicellulose was the major target in the first-stage hydrolysis. After recovering soluble sugars by washing from the first-stage hydrolysate with water, the washed first-stage hydrolysate solids were hydrolyzed again in the second stage at more severe conditions, such as 2.6 or 3.5 wt% H 2 SO 4 , 205 or 210 • C, and 80-135 s. After the two stages, the highest overall yields from 100 g of dry hemlock sawdust were a total of 39.3 g of fermentable sugars (36.0 and 3.3 g of hexose and pentose sugars, respectively). These results indicate that hemlock sawdust could be used to produce fermentable sugars which can be converted into other value-added bio-based products.

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Comparison of yellow poplar pretreatment between NREL digester and sunds hydrolyzer

Cited by 34 publications

References 5 publications

Effect of alcohol compounds found in hemicellulose hydrolysate on the growth and fermentation of ethanologenic Escherichia coli

Effect of alcohol compounds found in hemicellulose hydrolysate on the growth and fermentation of ethanologenic Escherichia coli

Development and Validation of a Kinetic Model for Enzymatic Saccharification of Lignocellulosic Biomass

Two‐stage dilute acid‐catalyzed hydrolytic conversion of softwood sawdust into sugars fermentable by ethanologenic microorganisms

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