Synergism of stable nitroxyl radicals and amines during the oxidation process of motor fuels and oils at increased temperatures

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.118784

Keywords:

Mannich base, additive, additives to fuels and lubricants, antioxidant, stable nitroxyl radicals.

Abstract

The alkylphenol Mannich bases (N-(4-methylphenyl)-N,N-bis-(3,5-di-tert-butyl-4-hydroxybenzyl)amine, N,N-dibenzyl-N-(3,5-di-tert-butyl-4-hydroxybenzyl)amine and tris-(3,5-di-tert-butyl-4-hydroxybenzyl)amine), which are promising antioxidants for fuels and lubricants, were synthesized by condensation of 2,6-di-tert-Butylphenol with formaldehyde and amines (n-toluidine, dibenzylamine and ammonia). Mannich bases also were synthesized by condensation of alkylphenols with diethylenetriamine.

The induction periods of the fuels and lubricants oxidation on the example of the vaseline oil at a temperature of 200 oC were determined by the method of oxygen absorption for the obtained Mannich bases and stable nitroxyl radicals (in particular 2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl and di-(2,2,6,6-tetramethyl-1-oxyl-4-piperidyl)isophthalate). It was found that in the case of the inhibited oxidation of hydrocarbons of fuels and lubricants, even at high temperatures (~200 oC), there is also a synergetic effect of stable nitroxyl radicals with the nitrogen-containing compounds, including the alkylphenol Mannich bases, which have −NH or β-CH< groups in relation to Nitrogen. So, the obtained results confirm the perspectiveness of the alkylphenol Mannich bases usage as the high-temperature oxidation inhibitors for fuels and lubricants (motor fuels and oils).

Author Biographies

Oleksandr Vasylkevych, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056

PhD, Associate Professor

Department of Organic Chemistry and Technology of Organic Compounds

Oleksii Kofanov, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056

Postgraduate student

Department of Environmental Engineering 

Olena Kofanova, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056

Doctor of Pedagogical Sciences, PhD, Professor

Department of Environmental Engineering 

Kostiantyn Tkachuk, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056

Doctor of Technical Sciences, Associate Professor, Head of Department

Department of Environmental Engineering 

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Published

2017-12-18

How to Cite

Vasylkevych, O., Kofanov, O., Kofanova, O., & Tkachuk, K. (2017). Synergism of stable nitroxyl radicals and amines during the oxidation process of motor fuels and oils at increased temperatures. Eastern-European Journal of Enterprise Technologies, 6(6 (90), 4–9. https://doi.org/10.15587/1729-4061.2017.118784

Issue

Vol. 6 No. 6 (90) (2017): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2017 Oleksandr Vasylkevych, Oleksii Kofanov, Olena Kofanova, Kostiantyn Tkachuk

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