The possibility of producing hexane-insoluble asphaltenes from a toluene solution of mid-temperature coal pitch is demonstrated. The topography, morphology, and structure of films consisting of asphaltene associates are studied by scanning and transmission electron microscopy. The thermal decomposition of hexane-insoluble asphaltenes is investigated in the range 20–800°C. Structuring of the film is observed at 495°C, regardless of the method employed: X-ray phase analysis or differential calorimetry. According to IR spectroscopic data, films heat-treated at 500°C contain graphene-like structures. X-ray diffraction shows the formation of graphene-like structures on heating the films to 800°C.
Coke and Chemistry – Springer Journals
Published: Jun 4, 2018
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