Carbonic acid enhancement of hydrolysis in aqueous pretreatment of corn stover

Walsum, G. Peter van; Shi, Helen

doi:10.1016/j.biortech.2003.11.009

Cited by 105 publications

(46 citation statements)

References 32 publications

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“…17,26 Overall optimization It is important to obtain hydrolysates with high sugar concentrations (carbon source for microorganism growth) and low concentrations of growth inhibitors (acetic acid and furfural) if they are to be used as fermentation media. Based on this consideration, the operational conditions were optimized using Equations (4),(9),(10), (12) and (13) and the values of kinetic parameters are shown in Tables 3,5,6,7 and 8. Table 9 shows the optimum conditions found for each set and the composition of the hydrolysates obtained under these conditions.…”

Section: Kinetic Modeling Of Furfural Concentrationsmentioning

confidence: 99%

Modeling and optimization of dilute nitric acid hydrolysis on corn stover

Zhang

Lü

Sun

et al. 2010

J. Chem. Technol. Biotechnol.

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BACKGROUND: Because of its high cost, nitric acid has not been widely employed as the catalyst for hydrolysis of lignocellulosic biomass to obtain fermentable sugars. However, recently more and more research results have reported that nitric acid was more effective than other acids for the hydrolysis of lignocellulose. Therefore, it is necessary to find an optimum condition for nitric acid pretreatment and a means of reducing the cost.

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Section: Kinetic Modeling Of Furfural Concentrationsmentioning

confidence: 99%

Modeling and optimization of dilute nitric acid hydrolysis on corn stover

Zhang

Lü

Sun

et al. 2010

J. Chem. Technol. Biotechnol.

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“…In addition, they do not explore temperatures above 1658C or residence times other than 1 h and only study wood. Several studies (McWilliams and van Walsum, 2002;van Walsum and Shi, 2004) used a water-rich liquid phase, containing dissolved CO 2 , to pretreat corn stover and aspen wood between 180 and 2208C. However, the biomass was not in direct contact with a supercritical CO 2 phase.…”

Section: Introductionmentioning

confidence: 99%

High‐solids biphasic CO₂–H₂O pretreatment of lignocellulosic biomass

Luterbacher

Tester

Walker

2010

Biotech & Bioengineering

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A high pressure (200 bar) CO(2)-H(2)O process was developed for pretreating lignocellulosic biomass at high-solid contents, while minimizing chemical inputs. Hardwood was pretreated at 20 and 40 (wt.%) solids. Switchgrass, corn stover, big bluestem, and mixed perennial grasses (a co-culture of big bluestem and switchgrass) were pretreated at 40 (wt.%) solids. Operating temperatures ranged from 150 to 250 degrees C, and residence times from 20 s to 60 min. At these conditions a biphasic mixture of an H(2)O-rich liquid (hydrothermal) phase and a CO(2)-rich supercritical phase coexist. Following pretreatment, samples were then enzymatically hydrolyzed. Total yields, defined as the fraction of the theoretical maximum, were determined for glucose, hemicellulose sugars, and two degradation products: furfural and 5-hydroxymethylfurfural. Response surfaces of yield as a function of temperature and residence time were compared for different moisture contents and biomass species. Pretreatment at 170 degrees C for 60 min gave glucose yields of 77%, 73%, and 68% for 20 and 40 (wt.%) solids mixed hardwood and mixed perennial grasses, respectively. Pretreatment at 160 degrees C for 60 min gave glucan to glucose yields of 81% for switchgrass and 85% for corn stover.

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“…The severity factor has been much used for reporting on biomass pretreatment (Abatzoglou et al, 1992;Bouchard et al, 1991;Chen et al, 2006;Chum et al, 1990;Garrote et al, 2002;Cullis et al, 2004;Jollez et al, 1994;McWilliams and van Walsum, 2002;Montane et al, 1994;Overend and Chornet, 1987;Soderstrom et al, 2003;van Walsum, 2001;Van Walsum and Shi, 2004;Yourchisin and van Walsum, 2004). In its commonly used form (Eq.…”

Section: Introductionmentioning

confidence: 99%

Pseudo reaction kinetics of organic degradation products in dilute-acid-catalyzed corn stover pretreatment hydrolysates

Chen

Mowery

Chambliss

et al. 2007

Biotechnol. Bioeng.

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A variety of degradation products are produced upon pretreatment of lignocellulosic biomass with dilute acid. To date, the complexity of these samples has significantly limited the scope of efforts to perform summative analyses of degradation products. Qualitative and quantitative interrogation of hydrolysates is also paramount to identifying potential correlations between pretreatment chemistry and microbial inhibition in downstream bioconversion processes. A recently developed reversed-phase high performance liquid chromatography technique with UV detection has been applied to perform quantitative assessments of a variety of hydrolysate components as a function of pretreatment time and temperature. Correlations of product concentrations to the pretreatment severity function indicate differing responses of various compounds to the kinetic influences of temperature and reaction time. Of the compounds measured, four demonstrated initial accumulation rates were sufficiently linear over the time period tested to enable determination of activation energy E(a). All four compounds appear to demonstrate higher E(a) than that assumed in the commonly applied severity function. Overall accumulation trends for most compounds indicated similar under-estimation of apparent activation energy by the severity function. Biotechnol. Bioeng. 2007;98: 1135-1145. (c) 2007 Wiley Periodicals, Inc.

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Carbonic acid enhancement of hydrolysis in aqueous pretreatment of corn stover

Cited by 105 publications

References 32 publications

Modeling and optimization of dilute nitric acid hydrolysis on corn stover

Modeling and optimization of dilute nitric acid hydrolysis on corn stover

High‐solids biphasic CO₂–H₂O pretreatment of lignocellulosic biomass

Pseudo reaction kinetics of organic degradation products in dilute-acid-catalyzed corn stover pretreatment hydrolysates

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Carbonic acid enhancement of hydrolysis in aqueous pretreatment of corn stover

Cited by 105 publications

References 32 publications

Modeling and optimization of dilute nitric acid hydrolysis on corn stover

Modeling and optimization of dilute nitric acid hydrolysis on corn stover

High‐solids biphasic CO2–H2O pretreatment of lignocellulosic biomass

Pseudo reaction kinetics of organic degradation products in dilute-acid-catalyzed corn stover pretreatment hydrolysates

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High‐solids biphasic CO₂–H₂O pretreatment of lignocellulosic biomass