Switchgrass is used for ethanol production. The composition of the switchgrass is 37% cellulose, 24% xylan, 3% galactan, 4% arabinan, 20% lignin, 7% extractives, and 5% ash. A dilute acid pretreatment method is applied to the switchgrass before enzymatic hydrolysis and fermentation. The pretreatment hydrolyzes 10% hexosan and 90% pentosan into monomeric sugars. Approximately 30% of the hydrolyzed pentoses are decomposed to furfural. Assume that there is no decomposition of the hydrolyzed hexoses. Assume that lignin, extractives, and ash do not change during the pretreatment.
Required:
How much sugars (glucose, xylose, galactose, and arabinose, respectively) are produced when pretreating 1,000 kg (dry matter) switchgrass?
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