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Kinetic and thermodynamic insights into the non-isothermal thermal decomposition of crude oil tank bottom sludge using isoconversional models: an energy–environment nexus approach
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DOI：10.1007/s10973-026-15974-7.png)
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Abstract
En 中文
The continual growth of oil refineries has increased in oily sludge production that generates hazardous waste. The present study used thermogravimetric analysis (TGA) to examine the pyrolytic nature of tank bottom sludge (TBS) through three heating rates. The activation energy of thermal decomposition was determined through isoconversional methods, which included the Starink, Kissinger–Akahira–Sunose (KAS) method, and Ozawa–Flynn–Wall (OFW) method for assessing kinetic and thermodynamic parameters. Physicochemical characterization indicated favorable pyrolysis-related properties, including a volatile matter content of 30.63% and H/C ratio 0.077. The TGA-DTG analysis conducted at 5, 10, and 15 °C min−1 showed its dominant mass loss process between 150 and 350 °C. The activation energy profiles was seen maximum at approximately 20% conversion, with closely comparable values obtained from all three isoconversional models, ranging from 177 to 179 kJ·mol−1 (OFW: 178.5 kJ·mol−1, KAS: 177.8 kJ·mol−1, Starink: 178.2 kJ·mol−1). Also, Z-master plot analysis suggested that the solid-state reaction mechanism governing petroleum sludge pyrolysis is strongly influenced by both the extent of conversion and the applied heating rate. The thermodynamic study revealed degradation of bottom tank sludge was complex, energy dependent, and involved the formation of ordered activated complexes during the degradation process. This study provides a comprehensive kinetic and reaction mechanism assessment of tank bottom sludge from Northeast India, offering insights into its potential for sustainable energy recovery and refinery waste management.
Keywords:
Petroleum hydrocarbons
Tank bottom sludge
Thermogravimetric analysis
Activation energy
Energy recovery
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3.1
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1.8W
Citations:
3.2W
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