Determination of the chemical composition of liquid products of thermocatalytic cracking of hydrocarbon mixtures
DOI:
https://doi.org/10.15328/cb2026_114Keywords:
pyrolysis, co-pyrolysis, thermocatalysis, waste, coal dust, plastics, gossypol resin, oil sludgeAbstract
This study presents the results of a comprehensive experimental investigation of the co-pyrolysis processes of carbon-containing wastes of various origins, including coal dust from the Kulan deposit, plastic waste based on polyethylene and polypropylene, gossypol resin isolated from soapstock generated during cottonseed oil production, and oil sludge from the “Petro Kazakhstan Oil Products” refinery (Shymkent). The experiments were carried out over a wide temperature range of 500–700 °C at atmospheric pressure in inert (N₂) and weakly acidic (CO₂) gas atmospheres. Fractional separation and identification of the components of the liquid pyrolysis products were performed using extraction methods. It was established that the nature of the gas medium and the process temperature exert a decisive influence on the yield and distribution of oil, resin, asphaltene fractions, and insoluble substances. It was shown that the thermocatalytic cracking of individual wastes and their mixtures (1:1:1:1) results in the formation of a liquid product dominated by oils and resins with a reduced asphaltene content. A pronounced synergistic effect of co-pyrolysis was identified, associated with the destruction of polyphenolic structures and fatty acids of gossypol resin, leading to hydrogen formation that contributes to the stabilization of active hydrocarbon radicals generated during the thermal decomposition of coal dust and polymer waste. This promotes the intensification of secondary synthesis reactions with the formation of olefins, aromatic hydrocarbons, and resinous compounds, as well as a redistribution of the fractional composition of liquid products toward an increased oil fraction at elevated temperatures. Gas chromatography–mass spectrometry analysis demonstrated that co-pyrolysis of the multicomponent mixture ensures the formation of hydrocarbon products with a uniform distribution across the main classes of compounds, confirming the potential of this approach for the integrated processing of heterogeneous carbon-containing wastes.
References
1. Romanova TA, Mikhailova ES, Ismagilov ZR (2017) Chemistry for Sustainable Development 25(6):544–551. https://doi.org/10.15372/CSD20170602
2. Aubakirov Y, Tashmukhambetova Z, Imanbayev Y, Nurtazina N, Kenzheyev B, Toshtay K (2024) ES Mater Manuf 24:1123. https://doi.org/10.30919/esmm1123
3. Li X, He L, Xu Z, Wang Z, Zhang S (2024) Process Saf Environ Prot 187:1010-1021. https://doi.org/10.1016/j.psep.2024.05.037
4. Singh RK, Gu S, Baliarsingh N (2025) S Afr J Chem Eng 54:216-230. https://doi.org/10.1016/j.sajce.2025.08.005
5. Yang Y, Wang Q, Li H (2023) Molecules 28(5)2313. https://doi.org/10.3390/molecules28052313
6. Zhang Q, Zhang S, Liu J, Chen X, Li W (2023) RSC Advances 13:33852–33862. https://doi.org/10.1039/D3RA06925G
7. Xie B, Zhang X, Gu S, Du Y, Wu J (2025) J Anal Appl Pyrolysis 193:107424. https://doi.org/10.1016/j.jaap.2025.107424
8. Tashmukhambetova Z, Aubakirov Y, Imanbayev Y, Nurtazina N, Kenzheyev B (2024) Chem J Kaz 3:157-166. https://doi.org/10.51580/2024-3.2710-1185.41
9. Wang YP, Zhang SM, Wu QH, Duan DL, Liu YH, et al (2019) International Int J Agric Eng 12(6)202–208. https://doi.org/10.25165/j.ijabe.20191206.4599
10. Wang Y, Dai L, Wang R, Fan L, Liu Y, et al (2016) J Anal Appl Pyrolysis 119:251–258. https://doi.org/10.1016/j.jaap.2016.01.008
11. Smith J, Johnson M, Lee A (2019) Fuel 255:115773. https://doi.org/10.1016/j.wasman.2019.03.030
12. Zhang X, Hu H, Pan H, Li D, Yan Y (2021) Nanomaterials 11(7):1659. https://doi.org/10.3390/nano11071659
13. Mousavi MV, Rezvani B, Hallajisani A (2025) J Energy Inst 119 102007. https://doi.org/10.1016/j.joei.2025.102007
14. Xuan W, Yan S, Dong Y (2023) Processes 11(9):2764. https://doi.org/10.3390/pr11092764
15. Marwani M, Trifarizy MD (2024) J Electr Eng Comput Sci 5(1):29–34. https://doi.org/10.51630/ijes.v5i1.104
16. Hamd MI, Akream NS, Gheni SAK (2025) J Pet Sci Res 15(3):68–84. https://doi.org/10.52716/jprs.v15i3.958
17. Silva RJO, Graf K, Leite ML (2025) J Eng Appl Sci 72:251. https://doi.org/10.1186/s44147-025-00799-2
18. Damayanti D, Saputri DR, Marpaung DSS., Yusupandi F, Sanjaya A, et al (2022) Polymers 14(15)3133. https://doi.org/10.3390/polym14153133
19. Hu C, Tang Z, Yao D, Yang H, Shao J, Chen H (2020) J Clean Prod 260:121102. https://doi.org/10.1016/j.jclepro.2020.121102
20. Hong D, Li P, Xi T, Guo S (2021) Energy 218:119553. https://doi.org/10.1016/j.energy.2020.119553
21. Larionov K, Kaltaev A, Slyusarsky K, Gvozdyakov D, Zenkov A, et al (2022) Appl Sci 12(3):1012. https://doi.org/10.3390/app12031012
22. Chu Z, Li Y, Zhang C, Fang Y, Zhao J (2023) J Environ Chem Eng 11:109692. https://doi.org/10.1016/j.jece.2023.109692
23. Di X, Pan H, Li D, Hu H, Hu Z, Yan Y (2021) Environ Sci Pollut Res 28:15536–15552. https://doi.org/10.1007/s11356-021-12872-z
24. Imanbayev Ye, Tileuberdi Ye, Aubakirov Ye et al (2025) Processes 13(11):3404. https://doi.org/10.3390/pr13113404
25. Bian H, Chen S, Qi J, Zhang L, Li Y. (2026) J Anal Appl Pyrolysis 193:107428. https://doi.org/10.1016/j.jaap.2025.107428
26. Han L, Li J, Qu C, Shao Z, Yu T, Yang B (2022) Sustainability 14(13):7574. https://doi.org/10.3390/su14137574
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