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首页> 外文期刊>Energy Conversion & Management >Two-stage pretreatment with alkaline sulphonation and steam treatment of Eucalyptus woody biomass to enhance its enzymatic digestibility for bioethanol production
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Two-stage pretreatment with alkaline sulphonation and steam treatment of Eucalyptus woody biomass to enhance its enzymatic digestibility for bioethanol production

机译：碱磺化两步预处理和桉木木质生物质的蒸汽处理，以提高其酶消化率，从而生产生物乙醇

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摘要

This work proposed a two-stage pretreatment with alkaline sulphonation and steam treatment, and investigated its efficiency for converting Eucalyptus woody biomass to fermentable sugars and bioethanol. Comparing with steam pretreatment and subsequent sulphonation, this alkaline sulphonation-steam pretreatment improved carbohydrate recovery by maintaining a more neutral pH throughout the pretreatment process, while promoting the enzymatic digestibility of biomass through lignin removal and modification. Results showed that the alkaline sulphonation-steam pretreatment caused lignin removal of 69.37% and 120.28 mmol/kg acid groups incorporation into substrate, both of which could lead to significantly improved cellulose accessibility. About 80% of the sugars present in the original carbohydrate (cellulose and hemicellulose) were released, which could be recovered after pretreatment and enzymatic hydrolysis. The sugars released from enzymatic hydrolysis of substrate pretreated by alkaline sulphonation-steam pretreatment could be efficiently converted to ethanol, indicating that alkaline sulphonation-steam two-stage pretreatment is a promising pretreatment approach of lignocellulosic biomass for the production of biofuels.
机译：这项工作提出了碱性磺化和蒸汽处理的两阶段预处理，并研究了其将桉木木质生物质转化为可发酵糖和生物乙醇的效率。与蒸汽预处理和随后的磺化相比，这种碱性磺化-蒸汽预处理通过在整个预处理过程中保持更中性的pH值来改善碳水化合物的回收率，同时通过木质素的去除和修饰促进生物质的酶消化性。结果表明，碱性磺化-蒸汽预处理可将木质素去除69.37％，并且将120.28 mmol / kg的酸基结合到基质中，这两者均可显着改善纤维素的可及性。原始碳水化合物（纤维素和半纤维素）中存在的糖中约有80％被释放，经过预处理和酶水解后可以回收。通过碱磺化-蒸汽预处理预处理的底物的酶促水解释放的糖可以有效地转化为乙醇，表明碱磺化-蒸汽两阶段预处理是一种有前景的木质纤维素生物质用于生产生物燃料的预处理方法。

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