Comparative data for enzymatic digestion of corn stover and poplar wood after pretreatment by leading technologies
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Ammonia explosion, aqueous ammonia recycle, controlled pH, dilute acid, flowthrough, lime, and sulfur dioxide steam explosion were applied to single sources of corn stover and poplar wood. Comparative data were developed on the digestibility of cellulose in the pretreated solids using a controlled source of enzyme. Application of identical material balance approaches showed that all of the pretreatments gave similar high yields of xylose and glucose sugars for corn stover, with xylanase activity being particularly important to releasing residual xylan in the pretreated solids for pretreatments at higher pH. However, consistently high digestion yields proved to be more difficult to attain with poplar, with yields from some pretreatments being higher than for others. Results differed between two sources of poplar due to higher lignin content or other variables. The influence of hemicellulase enzymes addition to the recovery of hemicellulose sugars from the pretreated solids was also studied. This is an abstract of a paper presented at the 2006 AIChE Annual Meeting (San Francisco, CA 11/12-17/2006).
