Abstract Reviewing the literature from the last decade regarding the bioconversion of corn stover into ethanol, 474 references were identified containing 561 datasets. We found 144 datasets which were sufficiently consistent and detailed to address the current state of the art of corn stover conversion to bioethanol, and we were able to categorise 93% of these datasets into eight different technological configurations for the production of bioethanol, based on the pretreatment approaches used. After pretreating, the corn stover is subject to hydrolysis and fermentation, but these two process steps were largely identical in all datasets, albeit a range of operating conditions was reported. The final distillation of the ethanol was very rarely included in the datasets. By parameterising the bioethanol production by 26 parameters, including corn stover compositions, solid loadings, operational conditions, conversion efficiencies and material consumption, we were able to quantify the material flows for each technological configuration and estimate the uncertainty of the flows. The eight technological configurations produced 11–22% ethanol from the dry solid content of the corn stover. Technologies using alkaline-, solvent or ammonia-based pretreatments produced the largest amount of ethanol (19–22%), while fungi-based pretreatment produced much less (11%). All technological configurations resulted in large flows of solid as well as liquid residues, typically containing 60 to 70% of the dry solid corn stover content. Based on the selected datasets, statistical description is provided for all parameters, including mode, median, average and deviation, within each technological configuration. Bivariate correlation analysis across and within all technological configurations indicates that some operational parameters usually considered crucial in laboratory studies, e.g. pretreatment severity, show from a statistical perspective very little correlation with the yields. The review reveals that a great deal of research has addressed the challenge of converting corn stover into bioethanol, but a significant part of these studies is of limited value in terms of scope and documentation when addressing overall material flows and key parameters in a technological context.

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来自玉米秸秆的生物乙醇——替代生物技术的审查和技术评估

摘要 回顾过去十年有关玉米秸秆生物转化为乙醇的文献，确定了 474 篇参考文献，其中包含 561 个数据集。我们找到了 144 个足够一致和详细的数据集，以解决玉米秸秆转化为生物乙醇的当前技术水平，并且我们能够将这些数据集的 93% 分为八种不同的生物乙醇生产技术配置，基于使用的预处理方法。预处理后，玉米秸秆进行水解和发酵，但这两个过程步骤在所有数据集中基本相同，尽管报告了一系列操作条件。乙醇的最终蒸馏很少包含在数据集中。通过将生物乙醇生产参数化为 26 个参数，包括玉米秸秆成分、固体负载、操作条件、转化效率和材料消耗，我们能够量化每种技术配置的材料流量并估计流量的不确定性。八种技术配置从玉米秸秆的干燥固体成分中生产了 11-22% 的乙醇。使用基于碱性、溶剂或氨的预处理技术产生的乙醇量最大 (19–22%)，而基于真菌的预处理产生的乙醇量要少得多 (11%)。所有技术配置都会产生大量固体和液体残留物，通常含有 60% 到 70% 的干固体玉米秸秆成分。根据选定的数据集，对所有参数进行统计描述，包括众数、中位数、平均值和偏差，在每个技术配置中。所有技术配置之间和内部的双变量相关分析表明，在实验室研究中通常被认为至关重要的一些操作参数，例如预处理的严重程度，从统计角度显示与产量的相关性很小。审查表明，大量研究已经解决了将玉米秸秆转化为生物乙醇的挑战，但在解决技术背景下的整体材料流和关键参数时，这些研究的很大一部分在范围和文件方面的价值有限。从统计的角度来看，与产量的相关性很小。审查表明，大量研究已经解决了将玉米秸秆转化为生物乙醇的挑战，但在解决技术背景下的整体材料流和关键参数时，这些研究的很大一部分在范围和文件方面的价值有限。从统计的角度来看，与产量的相关性很小。审查表明，大量研究已经解决了将玉米秸秆转化为生物乙醇的挑战，但在解决技术背景下的整体材料流和关键参数时，这些研究的很大一部分在范围和文件方面的价值有限。