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Abstract
Aqueous dilute acid pretreatments of corncob were conducted using cylindrical pressure vessels in an oil bath. Pretreatments were conducted in a temperature range of 160–190 °C with acid-solution-to-solid-corncob ratio of 2. The acid concentration (v/v) in the pretreatment solution was varied from 0% to 0.7%, depending on temperature. This gives acid charge on ovendry-weight corncob of 0–2.58%. It was found that optimal pretreatment temperature is between 160 and 170 °C based on total xylose and glucose yields and thermal energy consumption in pretreatment. At 170 °C and acid charge of 2.2% on cob, total glucose yield and xylose recovery were 97% and 75%, respectively, which resulted in an overall monomeric sugar recovery of about 88%. Xylose concentration in the hydrolysate was about 12%, with xylose-to-acetic-acid ratio of 8 and to furan (furfural and hydroxymethylfurfural) of about 15.
Keywords
Corncobs,
corn residues,
pretreatment,
biomass utilization,
glucose,
temperature,
cellulose,
biomass energy,
hydrolysis,
ethanol,
enzymes,
biotechnology,
industrial applications,
chemical reactions,
sugars,
energy consumption,
furfural,
acetic acid,
fermentation,
sulfuric acid,
corn as fuel,
biorefining,
bioconversion,
alcohol,
saccharification,
biomass fuel,
acid hydrolysis,
xylose,
hydrolysates,
biofuels,
hydroxymethylfurfural,
cellulosic ethanol,
enzymatic hydrolysis,
inhibitors
Citation
Wang, G.S.; Lee, Jae-Won; Zhu, J.Y.; Jeffries, Thomas W. 2011. Dilute acid pretreatment of corncob for efficient sugar production. Applied Biochemistry and Biotechnology. 163(5): 658-668.
