Ammonia recycled percolation process for pretreatment of herbaceous biomass View Full Text


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Article Info

DATE

1996-03

AUTHORS

Prashant V. Iyer, Zhang-Wen Wu, Sung Bae Kim, Yoon Y. Lee

ABSTRACT

An ammonia-based pretreatment method termed ammonia recycled percolation (ARP) was developed for pretreating herbaceous biomass like corn cobs/stover mixture (CCSM) and switchgrass. The process involves treatment of biomass with aqueous ammonia through a percolation reactor (packed-bed, flow-through type). The effects temperature, reaction time, and ammonia concentration were studied. The extent of delignification in the ARP process was in the range of 60–80% for CCSM and 65–85% for switchgrass. The ARP process solubilized significant amounts of the hemicellulose fraction into the pretreatment effluent, yet left most of the glucan fraction intact. The experimental data on CCSM and switchgrass indicate that the ARP is a highly effective pretreatment method. Near-complete conversion of cellulose to glucose was obtained by enzymatic hydrolysis of ARP-treated solid samples of CCSM, whereas conversion was slightly lower for switchgrass. The rate of enzymatic hydrolysis of ARP-treated samples was substantially higher than that of α-cellulose. The ARP effluents were evaluated for fermentability/toxicity by the xylose-fermenting yeastPichia stipitis (NRRL Y-11545). The adaptability of ARP-treated solid samples to simultaneous saccharification and fermentation (SSF) was tested for ethanol production using cellulase enzyme and the yeast,Saccharomyces cerevisiae (NREL, D5A). More... »

PAGES

121

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02941693

DOI

http://dx.doi.org/10.1007/bf02941693

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1039326247


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