STUDY ON THE COMPOSITION OF PRODUCTS FORMED DURING THE PYROLYSIS OF WASTE MOTOR OILS UNDER THE INFLUENCE OF TEMPERATURE
Authors
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Y.A. Aubakirov
Al-Farabi Kazakh National University, Almaty, Kazakhstan
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B.T. Kidirboev
Al-Farabi Kazakh National University, Almaty, Kazakhstan
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I.L. Simakova
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
- M.R. Rakhymzhan Al-Farabi Kazakh National University, Almaty, Kazakhstan
- B. Alibekov Al-Farabi Kazakh National University, Almaty, Kazakhstan
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K. Amantaiuly
Al-Farabi Kazakh National University, Almaty, Kazakhstan
DOI:
https://doi.org/10.55956/SIMD8398Keywords:
waste motor oil, thermal pyrolysis, temperature regime, group hydrocarbon composition, naphtha, diesel fuelAbstract
This study investigates the effect of temperature (380-440°C) on the group hydrocarbon composition of liquid products obtained during the thermal pyrolysis of waste motor oils (WMO). The experiments were carried out in an autoclave reactor under a nitrogen pressure of 0.5 MPa for 40 minutes with continuous stirring at 150 rpm. The resulting liquid products were separated by distillation into naphtha (30-180°C), kerosene (180-260°C), and gas oil (260-350°C) fractions, and their composition was analyzed using gas chromatography with a flame ionization detector (GC-FID, “Chromos GX-1000”). The results indicate that increasing the temperature from 380 to 440 °C leads to an increase in paraffin content in the naphtha fraction from 14% to 20% and naphthenes from 10% to 17%. Meanwhile, the proportion of aromatic hydrocarbons decreases from 42% to 32%, and olefins from 16% to 10%. Similar trends are observed for kerosene and gas oil fractions, where the total paraffinic hydrocarbon content increases by 10-11%. It is established that higher temperatures promote deeper thermal decomposition reactions and the formation of more stable saturated structures, enabling the effective utilization of the obtained liquid fractions as components of diesel fuel and light distillates.
