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Etude de la modification du comportement thermique des brais et des mélanges brai/coke par le soufre

Abstract : Coal tar Pitches (CTP) are the residues of cokefaction tar distillation. Their thermal behaviour could be modified by the utilization of additives like sulfur. This work is a systematic study of the factors which can modified the thermal behaviour of the CTP/coke blends, precursors of graphite materials, like the chemical composition of the CTP, the initial sulfur percentage, the heat law or the origin and properties of cokes. We have divided our work in two parts.In a first time we have studied the thermal behaviour of the CTP/sulfur mixtures. We have clearly shows the positive effect of sulfur on mesophase formation and in consequence on optical texture. Crieria have been defined, allowing to connect the blends thermal reactivity to the chemical composition of the CTP and more precisely, we have precised the light fraction role of CTP during thermal treatment and the role of QI on optical texture evolution. Utilization of spectoscopic and thermic methods allows us to follow evolution of sulfur structures and their stabilities in function of temperature. In the second part of this work, we have studied effect of coke addition on physical texture of CTP and thermal behaviour of CTP/coke/sulfur mixtures. Cokes have been characterized by their surface energies and morphologies. We have then tried to understand the physical phenomena on the CTP/coke interfaces using a non direct method based on selective solvant extraction of a CTP previously adsorbed on coke surface. The results show a modification of the CTP physical structure, put in evidence by an increase of the hexane yield extraction in a case of CTP/coke blends and by an evolution of the chemical composition of the hexan soluble fraction. All the results of this work is usefull for the comprehension of the sulfur role in CTP and for the adaptation to the industriel processes of graphite making
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Submitted on : Tuesday, April 24, 2018 - 3:31:51 PM
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Thierry Zimny. Etude de la modification du comportement thermique des brais et des mélanges brai/coke par le soufre. Chimie. Université Paul Verlaine - Metz, 1993. Français. ⟨NNT : 1993METZ015S⟩. ⟨tel-01775428⟩



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