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Behaviour of the antioxidant tert-butylhydroquinone on the storage stability and corrosive character of biodiesel

机译：抗氧化剂叔丁基氢醌对生物柴油的储存稳定性和腐蚀性的行为

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摘要

The behaviour of the antioxidant tert-butylhydroquinone (TBHQ) on the storage stability of biodiesel was investigated. Storage conditions were simulated through static immersion corrosion tests in biodiesel (with and without TBHQ) using copper coupons. Measurements of oxidation stability (Rancimat induction period) and metal release at different stages of corrosion were performed. After 24 h of the static immersion test, the neat and TBHQ-doped biodiesels presented induction times below the EN 14214 limit (6 h). Copper release was more intense in the neat biodiesel which evidenced that TBHQ.retarded the corrosion process as a corrosion inhibitor. Ion trap-time-of-flight mass spectrometry (IT-TOF-MS) revealed the presence of considerable amounts of tert-butylquinone (TBQ) in the TBHQ-doped biodiesel exposed to the corrosion process. As TBHQ molecules adsorb at the copper surface to inhibit corrosion, these molecules are catalytically oxidised to TBQ. IT-TOF-MS also indicated the formation of new molecules of high molecular weight only presented in the TBHQ-doped biodiesel deteriorated by the corrosion process. MS2 spectra gave clear evidence of the formation of new complexes between free radicals of long-chain molecules (fatty acid derivatives) and TBQ radicals during biodiesel deterioration.
机译：研究了抗氧化剂叔丁基氢醌（TBHQ）对生物柴油储存稳定性的影响。通过使用铜试样的生物柴油（带或不带TBHQ）中的静态浸没腐蚀测试，模拟了存储条件。在腐蚀的不同阶段进行了氧化稳定性（Rancimat诱导期）和金属释放的测量。静态浸没测试24小时后，纯净和TBHQ掺杂的生物柴油的诱导时间低于EN 14214限值（6小时）。纯生物柴油中的铜释放更加强烈，这表明TBHQ延迟了腐蚀过程，成为腐蚀抑制剂。离子阱飞行时间质谱（IT-TOF-MS）表明，暴露于腐蚀过程的TBHQ掺杂生物柴油中存在大量叔丁基醌（TBQ）。当TBHQ分子吸附在铜表面以抑制腐蚀时，这些分子被催化氧化为TBQ。 IT-TOF-MS还表明，只有在TBHQ掺杂的生物柴油中，高分子量的新分子才形成，该生物分子因腐蚀过程而恶化。 MS2光谱清楚地证明了生物柴油降解期间长链分子（脂肪酸衍生物）的自由基和TBQ自由基之间形成了新的络合物。

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  • 来源
    《Fuel》 |2011年第11期|p.3480-3484|共5页
  • 作者

    Eduardo S. Almeida; Flaysner M. Portela; Raquel M.F. Sousa; Daniela Daniel; Manuel G.H. Terrenes; Eduardo M. Richter; Rodrigo A.A. Munoz;

  • 作者单位

    Institute de Quimica, Universidade Federal de Uberlandia, Av. Joao Naves de Avila 2121, Bloco ID, 38400-902 Uberlandia - MG, Brazil;

    Institute de Quimica, Universidade Federal de Uberlandia, Av. Joao Naves de Avila 2121, Bloco ID, 38400-902 Uberlandia - MG, Brazil;

    Institute de Quimica, Universidade Federal de Uberlandia, Av. Joao Naves de Avila 2121, Bloco ID, 38400-902 Uberlandia - MG, Brazil;

    Shimadzu do Brasil. Av. Marques de Sao Vicente 1777, 01139-003, Sao Paulo - SP, Brazil;

    Institute de Quimica, Universidade Federal de Uberlandia, Av. Joao Naves de Avila 2121, Bloco ID, 38400-902 Uberlandia - MG, Brazil;

    Institute de Quimica, Universidade Federal de Uberlandia, Av. Joao Naves de Avila 2121, Bloco ID, 38400-902 Uberlandia - MG, Brazil;

    Institute de Quimica, Universidade Federal de Uberlandia, Av. Joao Naves de Avila 2121, Bloco ID, 38400-902 Uberlandia - MG, 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; storage; antioxidant; corrosion; copper;

    机译：生物柴油存储;抗氧化剂腐蚀;铜;

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