Two-temperature dilute-acid prehydrolysis of hardwood xylan using a percolation process

Journal Article · · Applied Biochemistry and Biotechnology; (United States)

DOI:https://doi.org/10.1007/BF02941784· OSTI ID:6929378

Torget, R; Hsu, T A ^[1]

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1. National Renewable Energy Lab., Golden, CO (United States)

A novel two-temperature dilute-acid prehydrolysis of hybrid poplar xylan that exploits the xylan biphasic kinetics at moderate temperatures is described. A lower temperature (140[degrees]C) is applied to hydrolyze the easily hydrolyzable xylan, and a higher temperature (170[degrees]C) is subsequently applied to hydrolyze the remaining xylan. Using a bench-scale percolation reactor, yields of soluble xylose expressed in monomeric xylose equivalents as high as 92% of theoretical have been achieved with only 2% of the xylan being degraded to furfural. The lignocellulosic substrate produced from the pretreatment is readily converted to ethanol at a yield of 94% of theoretical via a simultaneous saccharification and fermentation process in 48 h. In terms of both yield of xylose equivalents and ethanol product level and rate, these improvements are far superior to those previously reported using a single-temperature dilute-acid pretreatment. 36 refs., 5 figs., 1 tab.

• OSTI ID: 6929378
• Journal Information: Applied Biochemistry and Biotechnology; (United States), Journal Name: Applied Biochemistry and Biotechnology; (United States) Vol. 45-46; ISSN ABIBDL; ISSN 0273-2289
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090900* -- Biomass Fuels-- Processing-- (1990-)
ALCOHOLS
BIOCONVERSION
BIOSYNTHESIS
CARBOHYDRATES
CELLULOSE
CHEMICAL REACTIONS
DECOMPOSITION
ETHANOL
FERMENTATION
HEMICELLULOSE
HYDROLYSIS
HYDROXY COMPOUNDS
LIGNIN
LYSIS
ORGANIC COMPOUNDS
POLYSACCHARIDES
SACCHARIDES
SACCHARIFICATION
SOLVOLYSIS
SYNTHESIS
XYLANS