Authors: A.V. Papin, A.V. Nevedrov, T.G. Cherkasova, I.V. Bobrova

Title of the article: Assessment of the influence of various factors on the formation of mesophase in coal pitches and their qualitative characteristics

Year: 2024, Issue: 5, Pages: 57-64

Branch of knowledge: 2.6.12. Chemical technology of fuel and high-energy substances

Index UDK: 662.749.33

DOI: 10.26730/1999-4125-2024-5-57-64

Abstract: The mesophase pitch forms a thermotropic crystal, which makes it possible to organize feeding and form linear chains without using tension, thereby obtaining carbon fibers of the required length and high quality. The use of coal raw materials (coal tar – a product of high-temperature coking of coal) for the production of mesophase pitches, compared with other types of hydrocarbon raw materials, it provides a better quality of the mesophase in the pitch, a larger amount of it and a higher yield of mesophase pitch. In the production of mesophase pitches from coal tar coking of hard coals, the most significant and influencing the formation of mesophase in coal pitches are: 1) the quality of coal tar (respectively, the quality of coking coals, coking technologies, physical wear of coal coking furnaces and related equipment and pipelines); 2) temperature and period of thermal effect on coal tar; 3) composition of the gas medium in the reactor (its inertia); 4) pressure in the reactor. The possibility of radiating mesophase pitches from coal tar of PJSC "Coke" has been studied and established. The studies were carried out at temperatures equal to 390 °C and 420 °C in pure argon medium. The qualitative characteristics of the pitches were determined, the data obtained were analyzed, and the characteristics of the obtained mesophase pitches were matched with the required values of the quality indicators of raw materials for the production of carbon fibers from it. It was found that at 420-440 ° C, a mesophase pitch is obtained that is suitable for producing carbon fibers. The synthesis temperature of 400 ° C is insufficient to form the required amount of mesophase and its maximum size in size.

Key words: coal tar and coal pitch carbon fiber thermal synthesis mesophase pitch argon medium

Receiving date: 19.07.2024

Approval date: 29.09.2024

Publication date: 24.10.2024

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