Bioresource technology · 2011
Comparative material balances around pretreatment technologies for the conversion of switchgrass to soluble sugars.
Сравнительное исследованиеСтатьяПоддержка правительства СШАНазвание и аннотация: Перевод в очереди
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Garlock Rebecca J, Balan Venkatesh, Dale Bruce E, Pallapolu V Ramesh, Lee Y Y, Kim Youngmi, Mosier Nathan S, Ladisch Michael R, Holtzapple Mark T, Falls Matthew, Sierra-Ramirez Rocio, Shi Jian, Ebrik Mirvat A, Redmond Tim, Yang Bin, Wyman Charles E, Donohoe Bryon S, Vinzant Todd B, Elander Richard T, Hames Bonnie, Thomas Steve, Warner Ryan E
Аннотация
For this project, six chemical pretreatments were compared for the Consortium for Applied Fundamentals and Innovation (CAFI): ammonia fiber expansion (AFEX), dilute sulfuric acid (DA), lime, liquid hot water (LHW), soaking in aqueous ammonia (SAA), and sulfur dioxide (SO(2)). For each pretreatment, a material balance was analyzed around the pretreatment, optional post-washing step, and enzymatic hydrolysis of Dacotah switchgrass. All pretreatments+enzymatic hydrolysis solubilized over two-thirds of the available glucan and xylan. Lime, post-washed LHW, and SO(2) achieved >83% total glucose yields. Lime, post-washed AFEX, and DA achieved >83% total xylose yields. Alkaline pretreatments, except AFEX, solubilized the most lignin and a portion of the xylan as xylo-oligomers. As pretreatment pH decreased, total solubilized xylan and released monomeric xylose increased. Low temperature-long time or high temperature-short time pretreatments are necessary for high glucose release from late-harvest Dacotah switchgrass but high temperatures may cause xylose degradation.