Dilute sulfuric acid cycle spray flow-through pretreatment of corn stover for enhancement of sugar recovery
2009
Yan, Lishi | Zhang, Hongman | Chen, Jingwen | Lin, Zengxiang | Jin, Qiang | Jia, Honghua | Huang, He
A cycle spray flow-through reactor was designed and used to pretreat corn stover in dilute sulfuric acid medium. The dilute sulfuric acid cycle spray flow-through (DCF) process enhanced xylose sugar yields and cellulose digestibility while increasing the removal of lignin. Within the DCF system, the xylose sugar yields of 90-93% could be achieved for corn stover pretreated with 2% (w/v) dilute sulfuric acid at 95°C during the optimal reaction time (90min). The remaining solid residue exhibited enzymatic digestibility of 90-95% with cellulase loading of 60FPU/g glucan that was due to the effective lignin removal (70-75%) in this process. Compared with flow-through and compress-hot water pretreatment process, the DCF method produces a higher sugar concentration and higher xylose monomer yield. The novel DCF process provides a feasible approach for lignocellulosic material pretreatment.
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