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Hydrothermal processing of hardwoods and agro-industrial residues :evaluation of xylo-oligosaccharides production

机译:硬木和农业工业残留物的水热加工:木糖寡糖生产的评估

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摘要

Autohydrolysis was used as a pre-treatment method for the selective hydrolysis of hemicelluloses of four lignocellulosic materials: eucalypt wood chips (EWC), corn cobs (CC), wheat straw (WS) and brewery’s spent grain (BSG), and the process was optimized towards the production of xylo-oligosaccharides (XOS). The effects of temperature, both at isothermal (150-190ºC), and non-isothermal (up to 240ºC) conditions, and liquid-to-solid ratio (LSR), 8 or 10 g/g, on the composition of both the liquid and solid phases were studied. The operational conditions leading to the maximal recovery of XOS for each raw material were established and discussed based on the severity factor (log R0). The higher yields obtained were in the range of 43–65% of the feedstock (arabino)xylan, with the highest value attained for CC for log R0 =3.75. Under the optimised conditions for XOS production, glucan was only slightly solubilised, enabling an enrichment of the solid phase (up to 67% of glucan for EWC). Delignification was also not extensive reaching utmost 18%, in the case of CC. cosmetic industries.
机译:自水解被用作选择性水解四种木质纤维素材料的半纤维素的预处理方法:桉木片(EWC),玉米芯(CC),小麦秸秆(WS)和啤酒厂的废谷物(BSG),该过程为针对木糖寡糖(XOS)的生产进行了优化。恒温(150-190ºC)和非恒温(最高240ºC)条件下的温度以及液固比(LSR)为8或10 g / g对两种液体组成的影响和固相进行了研究。基于严重性因素(log R0)建立并讨论了导致每种原料的XOS最大化回收的操作条件。获得的较高产率为原料(阿拉伯)木聚糖的43–65%,对于log R0 = 3.75,CC达到最高值。在XOS生产的最佳条件下,葡聚糖仅被微溶,从而使固相富集(用于EWC的葡聚糖含量高达67%)。就CC而言,去木质化也没有达到最大18%。化妆品行业。

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