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Thermal Lens Temperature Scanning technique for evaluation of oxidative stability and time of transesterification during biodiesel synthesis

机译：热透镜温度扫描技术，用于评估生物柴油合成过程中的氧化稳定性和酯交换时间

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摘要

In this work, laser-induced Thermal Lens Temperature Scanning technique (TL-TS) is applied to evaluate oxidative stability and time of transesterification during biodiesel synthesis. Samples collected at different time intervals during the transesterification process of sunflower (SF) and soybean (SB) oils were submitted to fast oxidation through temperature scanning (between 22 and 190 degrees C), and simultaneously measured with the TL-TS technique. Temperature dependence of Thermal Lens effect amplitude showed the occurrence of oxidation, with the onset (T-onset) changing with the transesterification stages from 149 to 169 degrees C for sunflower and from 120 to 142 degrees C for soybean samples. The characteristic evolution of T-onset with reaction duration was estimated to be similar to 7 min for sunflower and similar to 10 min for soybean samples. The thermal diffusivity values were shown to be sensitive to rapid changes at transition temperatures, which could be related to molecular ruptures. Additional measurements were performed with DSC, TG and FTIR, to validate the information obtained by the TL-TS technique. In conclusion, the results showed the TL-TS technique as a promising tool for oxidative stability evaluation and determination of both chosen working temperature and minimal time interval for the solution to reach an optimized transesterification stage, thus contributing for reduction of costs, quality control and consequently for certification of biodiesel fuels. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在这项工作中，激光诱导的热透镜温度扫描技术（TL-TS）用于评估生物柴油合成过程中的氧化稳定性和酯交换时间。在向日葵油（SF）和大豆油（SB）的酯交换过程中，以不同的时间间隔收集的样品通过温度扫描（在22至190摄氏度之间）进行快速氧化，并同时使用TL-TS技术进行测量。热透镜效应幅度的温度依赖性显示了氧化的发生，向日葵的起始（T起始）随着酯交换阶段从149到169℃，大豆样品的从120到142℃而变化。据估计，T起始的特征演变随反应时间的延长，向日葵约为7分钟，大豆样品约为10分钟。结果表明，热扩散率值对转变温度下的快速变化敏感，这可能与分子断裂有关。使用DSC，TG和FTIR进行了其他测量，以验证通过TL-TS技术获得的信息。总之，结果表明，TL-TS技术是一种有前途的工具，可用于评估氧化稳定性并确定所选的工作温度和最短时间间隔，以使溶液达到最佳的酯交换阶段，从而有助于降低成本，控制质量并降低成本。因此，用于生物柴油燃料的认证。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第15期|78-84|共7页
  • 作者

    Constantino R.; Lenzi G. G.; Franco M. G.; Lenzi E. K.; Bento A. C.; Astrath N. G. C.; Malacarne L. C.; Baesso M. L.;

  • 作者单位

    Univ Tecnol Fed Parana, Campo Mourao, Parana, Brazil;

    Univ Tecnol Fed Parana, Ponta Grossa, Parana, Brazil;

    Univ Estadual Maring, Dept Fis, Av Colombo 5790, BR-87020900 Maringa, Parana, Brazil;

    Univ Estadual Maring, Dept Fis, Av Colombo 5790, BR-87020900 Maringa, Parana, Brazil|Univ Estadual Ponta Grossa, Dept Fis, Av Gen Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, Parana, Brazil;

    Univ Estadual Maring, Dept Fis, Av Colombo 5790, BR-87020900 Maringa, Parana, Brazil;

    Univ Estadual Maring, Dept Fis, Av Colombo 5790, BR-87020900 Maringa, Parana, Brazil;

    Univ Estadual Maring, Dept Fis, Av Colombo 5790, BR-87020900 Maringa, Parana, Brazil;

    Univ Estadual Maring, Dept Fis, Av Colombo 5790, BR-87020900 Maringa, Parana, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biodiesel; Transesterification duration; Oxidative stability; Thermal Lens technique; Temperature scanning;

    机译：生物柴油酯交换反应持续时间氧化稳定性热透镜技术温度扫描;

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