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Neutralization Mechanism of Acetic Acid by Overbased Colloidal Nanoparticles

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Abstract

The neutralization reaction mechanism of acetic acid by fully formulated lubricant oil is discussed in this paper. The video analysis of acetic-acid droplets in oil phase indicates that neutralization exists simultaneously on the oil–acid interface and bulk oil phase during the droplet shrinkage. This behavior is different from the one exhibited by sulfuric acid, which is insoluble in base oil and its neutralization by overbased lubricant occurs exclusively at the oil–acid interface. Besides, FTIR and NMR analyses show the neutralization of acetic acid as an instantaneous process, and almost all of the dissolved acetic acids in the bulk are eventually neutralized. Therefore, a two-mode-mechanism, including both interfacial and bulk reaction, is proposed for the neutralization of acetic acid by overbased nanoparticles. At the end, tribological behavior of sulfuric acid and acetic-acid neutralization products is discussed.

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Acknowledgments

The authors are grateful to Marco Lattuada, of Eni S.p.A., for the preparation of the fully formulated oil sample and for the helpful discussions. Support from Eni S.p.A. and Tulane’s Department of Chemical & Biomolecular Engineering made this work possible.

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Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA, 70118, USA

    Yufei Duan & Kyriakos D. Papadopoulos

  2. Eni S.p.A. Upstream and Technical Services, San Donato Milanese Research Center, Via Maritano 26, 20097, San Donato Milanese, Italy

    Riccardo Rausa

  3. Department of Chemistry, Tulane University, New Orleans, LA, 70118, USA

    Qi Zhao

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  1. Yufei Duan
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Correspondence to Kyriakos D. Papadopoulos.

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Duan, Y., Rausa, R., Zhao, Q. et al. Neutralization Mechanism of Acetic Acid by Overbased Colloidal Nanoparticles. Tribol Lett 64, 8 (2016). https://doi.org/10.1007/s11249-016-0742-3

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