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On the Determination of Water Content in Biomass Processing

机译：关于生物质加工中水分含量的测定

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摘要

Processing of lignocellulosic materials to fuels such as methane and bioethanol may involve several processing steps including pretreatment, saccharification, fermentation, and anaerobic digestion. The amounts of substrate used in these processes are usually based on dry matter content, and the processes themselves typically lead to a change in dry matter content. Thus, it is of great importance to be able to measure dry matter accurately. Dry matter content is commonly determined by measuring loss of water during oven drying. We have used Karl Fischer (KF) titration to measure the water content in a wide range of biomass fractions and have compared these data to results obtained by oven drying. This revealed considerable differences for all tested materials. For lignocellulosic materials, oven drying tends to overestimate dry matter content for untreated material. On the other hand, oven drying generally underestimates dry matter content in pretreated materials due to loss of organic volatiles. These differences have major consequences for the calculation of mass balances and yields in bioprocessing. The KF method gives more accurate water determination than oven drying due to the unique selectivity of the analysis. The method is suitable for the analysis of lignocellulosic biomasses and is particularly useful for determination of water content in pretreated materials, where oven drying usually underestimates the dry matter content due to loss of volatiles.
机译：将木质纤维素材料加工成甲烷和生物乙醇等燃料可能涉及多个加工步骤，包括预处理，糖化，发酵和厌氧消化。这些过程中使用的底物量通常基于干物质含量，而过程本身通常会导致干物质含量发生变化。因此，能够准确地测量干物质非常重要。干物质含量通常通过测量烤箱干燥过程中的水分损失来确定。我们已经使用卡尔·费休（KF）滴定法来测量各种生物质馏分中的水含量，并将这些数据与通过烤箱干燥获得的结果进行了比较。这揭示了所有测试材料的显着差异。对于木质纤维素材料，烤箱干燥往往会高估未处理材料的干物质含量。另一方面，由于有机挥发物的损失，烤箱干燥通常会低估预处理材料中的干物质含量。这些差异对生物处理过程中的质量平衡和产量的计算具有重大影响。由于分析的独特选择性，KF法比烤箱干燥法更准确地测定水。该方法适用于分析木质纤维素生物质，特别适用于测定预处理材料中的水含量，在这种情况下，烤箱干燥通常会由于挥发物的损失而低估了干物质的含量。

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  • 来源
    《Bioenergy research》 |2014年第1期|442-449|共8页
  • 作者

    Jane W. Agger; P?l J. Nilsen; Vincent G. H. Eijsink; Svein J. Horn;

  • 作者单位

    1.Department of Chemistry Biotechnology and Food Science Norwegian University of Life Sciences P.O. Box 5003 1432 Ås Norway;

    2.Cambi AS P.O. Box 78 1371 Asker Norway;

    1.Department of Chemistry Biotechnology and Food Science Norwegian University of Life Sciences P.O. Box 5003 1432 Ås Norway;

    1.Department of Chemistry Biotechnology and Food Science Norwegian University of Life Sciences P.O. Box 5003 1432 Ås Norway;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Water Determination Karl Fischer Loss on Drying Biomass Biogas Biofuel;

    机译：干燥生物质沼气生物燃料的水分测定卡尔·费休损失;

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