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Polar nitrogen-containing aromatic compounds as carriers of natural diesel lubricity

机译：极性含氮芳香族化合物作为天然柴油润滑性的载体

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摘要

Hydrodesulfurization (HDS) reduces the original lubricity of diesel fuel on which fuel injection equipments (FIE) rely for proper operation and lifetime. In technical terms this problem was solved by addition of lubricity additives to low and ultra-low sulfur diesel. In scientific terms there is no clear final conclusion on the role of neither sulfur- nor polar oxygen- and nitrogen-containing compounds. In this study, polar compounds were extracted from a gas oil by an ionic liquid so that the fuel was not saturated by hydrogen like in the industrial HDS process. Stepwise extraction and measurement of sulfur and nitrogen contents as well as lubricity revealed a significant correlation between lubricity and nitrogen content. For investigation on the molecular structure of the lubricating nitrogen compound, selected model compounds with different structural features were added to an ultra-low sulfur diesel (ULSD). The results indicate that the combination of a diaromatic base structure with a polar substituent and a nitrogen het-eroatom exhibits excellent lubricity improvement superior to those structures lacking one or more of these three properties. A three-stage tribological model for the boundary lubrication by such compounds is proposed in this paper. These compounds are identified as the main carrier of original diesel lubricity which are removed by the industrial HDS process.
机译：加氢脱硫（HDS）降低了柴油的原始润滑性，燃油喷射设备（FIE）依靠柴油来保持正常的运行和使用寿命。从技术上讲，通过在低硫和超低硫柴油中添加润滑性添加剂解决了这一问题。用科学术语，尚无关于含硫或极性含氧氮化合物的作用的明确最终结论。在这项研究中，极性化合物是通过离子液体从轻油中提取的，因此燃料不会像工业HDS工艺那样被氢饱和。逐步提取和测量硫和氮含量以及润滑性表明，润滑性和氮含量之间存在显着相关性。为了研究润滑性氮化合物的分子结构，将具有不同结构特征的选定模型化合物添加到超低硫柴油（ULSD）中。结果表明，具有极性取代基的二芳族基础结构和氮杂原子的组合显示出优异的润滑性改善，优于缺乏这三种性质中的一种或多种的那些。本文提出了一种三阶段摩擦学模型，用于这类化合物的边界润滑。这些化合物被确定为原始柴油润滑性的主要载体，并已通过工业HDS工艺去除。

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  • 来源
    《Fuel》 |2015年第15期|770-777|共8页
  • 作者

    M. Matzke; A. Jess; U. Litzow;

  • 作者单位

    Robert Bosch GmbH, 70042 Stuttgart, Germany;

    Institute of Chemical Engineering, University of Bayreuth, 95440 Bayreuth, Germany;

    Robert Bosch GmbH, 70042 Stuttgart, Germany;

  • 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

    Lubricity; Hydrodesulfurization; Ionic liquid extraction; Nitrogen; Aromatics;

    机译：润滑性加氢脱硫离子液体萃取;氮;芳香族;

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