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首页> 外文期刊>Energy & fuels >Determination of Carbonyl Groups in Pyrolysis Bio-oils Using Potentiometric Titration: Review and Comparison of Methods
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Determination of Carbonyl Groups in Pyrolysis Bio-oils Using Potentiometric Titration: Review and Comparison of Methods

机译：电位滴定法测定热解生物油中的羰基：方法综述与比较

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摘要

Carbonyl compounds present in bio-oils are known to be responsible for bio-oil property changes upon storage and during upgrading. As such, carbonyl content has previously been used as a method of tracking bio-oil aging and condensation reactions with less variability than viscosity measurements. Given the importance of carbonyls in bio-oils, accurate analytical methods for their quantification are very important for the bio-oil community. Potentiometric titration methods based on carbonyl oximation have long been used for the determination of carbonyl content in pyrolysis bio-oils. Here, we present a modification of the traditional carbonyl oximation procedures that results in less reaction time, smaller sample size, higher precision, and more accurate carbonyl determinations. Some compounds such as carbohydrates are not measured by the traditional method (modified Nicolaides method), resulting in low estimations of the carbonyl content. Furthermore, we have shown that reaction completion for the traditional method can take up to 300 h. The new method presented here (the modified Faix method) reduces the reaction time to 2 h, uses triethanolamine (TEA) in the place of pyridine, and requires a smaller sample size for the analysis. Carbonyl contents determined using this new method are consistently higher than when using the traditional titration methods.
机译：已知存在于生物油中的羰基化合物负责储存和升级过程中生物油性质的变化。因此，羰基含量先前已被用作跟踪生物油老化和缩合反应的方法，其变化性小于粘度测量值。鉴于羰基化合物在生物油中的重要性，准确的定量分析方法对生物油界非常重要。长期以来，基于羰基肟化的电位滴定法一直用于测定热解生物油中的羰基含量。在这里，我们提出了对传统羰基肟化方法的改进，从而缩短了反应时间，减小了样品尺寸，提高了精密度，并实现了更精确的羰基测定。某些化合物（例如碳水化合物）无法通过传统方法（改良的Nicolaides方法）进行测量，导致羰基含量的估算值较低。此外，我们已经表明，传统方法的反应完成可能需要300个小时。此处介绍的新方法（改良的Faix方法）将反应时间缩短至2小时，使用三乙醇胺（TEA）代替吡啶，并且需要较小的样品量进行分析。使用这种新方法测定的羰基含量始终高于使用传统滴定方法的含量。

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  • 来源
    《Energy & fuels》 |2016年第2期|1071-1077|共7页
  • 作者

    Black Stuart; Ferrell Jack R. III;

  • 作者单位

    Natl Renewable Energy Lab, Natl Bioenergy Ctr, 15013 Denver West Pkwy, Golden, CO USA;

    Natl Renewable Energy Lab, Natl Bioenergy Ctr, 15013 Denver West Pkwy, Golden, CO USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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