School of Engineering, RMIT University, Swanston Street 3000, Melbourne, Australia.
School of Science, RMIT University, Bundoora 3083, Australia.
Bioresour Technol. 2018 Feb;250:673-682. doi: 10.1016/j.biortech.2017.11.084. Epub 2017 Nov 28.
Optimisation of conditions for gamma-valerolactone (GVL) pretreatment of Australian eucalyptus sawdust for high cellulose biomass and bioethanol production was demonstrated. Pretreatment parameters investigated included GVL concentrations of 35-50% w/w, temperatures of 120-180 °C and reaction durations of 0.5-2.0 h. Optimum conditions were determined using the response surface method (RSM) and central composite face-centred design. Cellulose content increased from 39.9% to a maximum of 89.3% w/w using treatments with 50% GVL at 156 °C for 0.5 h. Temperature had the most significant effect (RSM p < .05) on cellulose content of residual biomass and reducing operational duration of < 0.5 h may be viable according to RSM. PSSF fermentations of optimised pretreated eucalyptus sawdust produced up to 94% theoretical ethanol yield, which corresponded to approximately 181 kg of ethanol per dry ton of eucalyptus sawdust. The compositions of both the residual biomass and pretreatment liquors show that GVL pretreatment is a promising solvent for lignocellulosic biorefining.
优化了γ-戊内酯（GVL）预处理澳大利亚桉树锯末的条件，以生产高纤维素生物质和生物乙醇。研究的预处理参数包括 GVL 浓度为 35-50%（w/w）、温度为 120-180°C 和反应时间为 0.5-2.0 h。使用响应面法（RSM）和中心复合面心设计确定了最佳条件。纤维素含量从 39.9%增加到最大值 89.3%（w/w），使用 50%GVL 在 156°C 下处理 0.5 h。温度对残余生物质纤维素含量的影响最大（RSM p<.05），根据 RSM，操作时间<0.5 h 可能是可行的。优化预处理后的桉树锯末的 PSSF 发酵最高可生产 94%的理论乙醇产量，相当于每干吨桉树锯末可生产约 181 千克乙醇。残余生物质和预处理液的组成表明，GVL 预处理是木质纤维素生物炼制有前途的溶剂。
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