2-TEMPERATURE DILUTE-ACID PREHYDROLYSIS OF HARDWOOD XYLAN USING A PERCOLATION PROCESS

Authors
Citation
R. Torget et Ta. Hsu, 2-TEMPERATURE DILUTE-ACID PREHYDROLYSIS OF HARDWOOD XYLAN USING A PERCOLATION PROCESS, Applied biochemistry and biotechnology, 45-6, 1994, pp. 5-22
Citations number
36
Categorie Soggetti
Biothechnology & Applied Migrobiology",Biology
ISSN journal
02732289
Volume
45-6
Year of publication
1994
Pages
5 - 22
Database
ISI
SICI code
0273-2289(1994)45-6:<5:2DPOHX>2.0.ZU;2-S
Abstract
A novel two-temperature dilute-acid prehydrolysis of hybrid poplar xyl an that exploits the xylan biphasic kinetics at moderate temperatures is described. A lower temperature (140 degrees C) is applied to hydrol yze the easily hydrolyzable xylan, and a higher temperature (170 degre es 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 bee n achieved with only 2% of the xylan being degraded to furfural. The l ignocellulosic substrate produced from the pretreatment is readily con verted to ethanol at a yield of 94% of theoretical via a simultaneous saccharification and fermentation process in 48 h. In terms of both yi eld of xylose equivalents and ethanol production level and rate, these improvements are far superior to those previously reported using a si ngle-temperature dilute-acid pretreatment.