Ethyl xylosides formation during SO2-Ethanol-Water (SEW) pulping of sugarcane straw, 2017PEERS

The SO2-ethanol-water (SEW) or AVAP® process produces easily fermentable pulp fibers and monomeric sugars dissolved in the spent liquor stream. The SEW pulping process is evaluated for the formation of α-ethyl-xyloside (aEX) and β-ethyl-xyloside (bEX) from the reaction of ethanol with xylose. Pulping is carried out at 135, 145 and 155°C for 20-120 minutes at a fixed liquor composition (SO2/Ethanol/Water = 12:44:44, w/w) and liquor to feedstock ratio (4 l kg-1). The combined severity factor (CSF) is used to describe the pulping severity. Maximum ethyl xylosides (EX, or sum of aEX and bEX) and monomeric xylose concentrations are observed at a CSF of 2.4±0.1. The amount of EX in the spent liquor at CSF 2.4 accounts for nearly 14 g ethanol per kg of dry sugar cane straw. The implications for downstream recovery of ethanol and sugars from the spent liquor are discussed. 

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