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首页> 外文期刊>Biofuels, bioproducts & biorefining: Biofpr >Cost competitive second-generation ethanol production from hemicellulose in a Brazilian sugarcane biorefinery
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Cost competitive second-generation ethanol production from hemicellulose in a Brazilian sugarcane biorefinery

机译：从巴西甘蔗生物遗料中的半纤维素产生具有成本竞争性第二代乙醇生产

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Producing second-generation ethanol from the five carbon (C5) sugars in bagasse and cane trash could increase ethanol yield at first-generation sugarcane biorefineries in Brazil. Co-fermenting C5 sugars with cane juice and molasses in the first-generation fermenters is a potentially attractive process configuration enabled by recent biotechnology advances. To assess the feasibility of this cofermentation, batch fermentations of molasses supplemented with xylose, the primary C5 sugar in hemicellulose, were conducted at lab scale using a yeast strain, M3799, engineered to ferment xylose. At cell loadings consistent with Brazilian fuel ethanol fermentation, M3799 was able to convert 17.8 g/L of xylose sugar along with sugars typically found in molasses to produce 71.5 g/L of ethanol in 8 h. Based on this capability, a process that produces a C5-enriched cane juice by integrating a steam pre-treatment reactor with the existing cane mill is investigated. Process modeling analysis of several integrated pre-treatment configurations predicts that sugar recovery on cane can be increased by 11% to 20% compared to traditional milling. This additional sugar can be fermented by C5 yeast in the first-generation fermentation to produce up to 37% more ethanol without effecting sugar coproduction. Due to close integration with the first-generation host plant, these projects achieve a minimum ethanol selling price (MESP) of $0.17/L to $0.29/L at a 10% return, which is lower than the reported MESP for other second-generation projects and is cost competitive with first-generation ethanol and gasoline. This translates to capital payback (EBITA/Capex) in two to four years. (c) 2016 The Authors. Biofuels, Bioproducts, and Biorefining published by Society of Chemical Industry and John Wiley & Sons, Ltd.
机译：从甘蔗渣和甘蔗垃圾中产生来自五种碳（C5）糖的第二代乙醇可以增加巴西第一代甘蔗生物料理的乙醇产量。第一代发酵罐中的C5糖和第一代发酵罐中的糖蜜是一种潜在有吸引力的工艺配置，最近的生物技术进步。为了评估该谱的可行性，使用酵母菌菌株M3799在实验室测量中，在实验室规模中，在实验室规模中，在M3799，工程化以发酵木糖的实验室规模进行糖蜜的糖蜜的糖蜜的分批发酵。在与巴西燃料乙醇发酵一致的细胞载荷中，M3799能够将17.8g / L的木糖糖以及通常在糖蜜中发现的糖转化为8小时产生71.5g / L的乙醇。基于这种能力，研究了通过将蒸汽预处理反应器与现有的甘蔗磨机与现有的甘蔗磨机集成来产生C5富集的甘蔗汁的方法。与传统铣削相比，几种综合预处理配置的过程建模分析预测，与传统铣削相比，甘蔗的糖回收率可以增加11％至20％。在第一代发酵中可以通过C5酵母发酵这种额外的糖，以产生高达37％的乙醇，而不会影响糖共合产。由于与第一代宿主工厂密切集成，这些项目以10％的回报达到0.17 / L至0.29 / L的最低乙醇销售价格（MES）至0.29 / L.低于其他第二代项目的MES并且与第一代乙醇和汽油具有成本竞争力。这意味着在两到四年内转化为资本回报（Ebita / Capex）。 （c）2016年作者。化学工业社会和约翰瓦里和儿子，Ltd。发表的生物燃料，生物燃料和生物融合

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