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Synthesis of butyl-octyl-diphenylamine as lubricant antioxidant additive by ionic liquids

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Abstract

Ionic liquid used in Friedel-Crafts reaction catalytic of dialkyl diphenylamine is a green environmental method. In this paper, butyl-octyl-diphenylamine (BODPA) was synthesized by the series of 1-butyl-3-methylimidazolium chloroaluminate (BMIM-AlCl3) ionic liquids catalysts. Pressure differential scanning calorimetry (PDSC) was used to test antioxidant properties of BODPA in lubricating oil. The influences of various reaction parameters such as dosage of catalysts, molar ratio of diphenylamine to chloralkane, reaction temperature, and time on the alkylation catalyzed by BMIM-AlCl3 have been studied. The molecular structure and content of alkyl diphenylamine were also characterized by FT-IR/GC-MS.

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Authors and Affiliations

  1. State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, 430030, China

    W. Zhan, J. S. Tu, X. Z. Qian & J. Li

  2. SOUTH China Branch, Sinopec Sales CO.LD, Guang Zhou, 510610, China

    J. Liu

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  1. W. Zhan
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  2. J. S. Tu
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  3. X. Z. Qian
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  4. J. Li
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Correspondence to W. Zhan.

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Zhan, W., Tu, J.S., Qian, X.Z. et al. Synthesis of butyl-octyl-diphenylamine as lubricant antioxidant additive by ionic liquids. Int J Adv Manuf Technol 96, 1647–1653 (2018). https://doi.org/10.1007/s00170-017-0836-6

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  • DOI: https://doi.org/10.1007/s00170-017-0836-6

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