O. Vasylkevych, O. Kofanov, O. Kofanova
Dec 18, 2017
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Influential Citations
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Journal
Eastern-European Journal of Enterprise Technologies
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 o C 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 o C), 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).