Effect of Temperature on the Chemical Composition and Physicochemical Properties of Diester Aviation Lubrication Oil
| Autor: | Jianqiang Hu, Yongli Shen, Xiaoxiao Liao, Na Zhang, Yao Ting, Zhuoting Gan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Thermal oxidation Article Subject General Chemical Engineering Infrared spectroscopy 02 engineering and technology Polymer Thermal treatment 021001 nanoscience & nanotechnology Chemical engineering 020303 mechanical engineering & transports Differential scanning calorimetry 0203 mechanical engineering chemistry TP155-156 Gas chromatography 0210 nano-technology Chemical composition Pyrolysis |
| Zdroj: | International Journal of Chemical Engineering, Vol 2020 (2020) |
| ISSN: | 1687-8078 1687-806X |
| Popis: | High temperature is the main factor responsible for degrading the lubrication and antiwear properties of aero-lubricating oils. Accordingly, this study assessed the effects of thermal treatment of diester aviation lubricating oil and the associated mechanism. Fourier-transform infrared spectroscopy and gas chromatography/mass spectrometry analyses showed that low-molecular-weight compounds, such as monoesters, diesters, alcohols, and olefins, were the primary degradation products. An assessment of the degradation mechanism of bis(2-ethylhexyl)decanedioate showed that pyrolysis, resulting in the cleavage of β-C–H and C–C bonds, was the main process involved. Additional investigation using advanced polymer chromatography showed that the molecular weights of oil samples changed slightly at high temperatures, while the viscosity and viscosity-temperature index values were relatively stable. High-pressure differential scanning calorimetry established that the thermal oxidation stability of these oils decreased above 250°C. Finally, variations in the chemical compositions of the oil samples were found to be highly correlated with changes in physicochemical properties during thermal processing, with the formation of low-molecular-weight polar compounds greatly increasing the acid numbers of the oils. |
| Databáze: | OpenAIRE |
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