Home – Home – Jornals – Chemistry for Sustainable Development 2019 number 6

The properties of the pitch samples obtained through the thermal dissolution of coal were studied using a unit with a flow tubular reactor. Their main differences were analyzed in comparison with coal-tar pitch. It was shown that in terms of elemental composition, extractive pitches are characterized by lower carbon content and a high percentage of oxygen, compared to the traditional binder. Their technological parameters are characterized by increased softening point and low coke residue. These features are a consequence of molecular composition. According to IR and NMR spectroscopy, the aromaticity factor of the alternative binder is relatively low, the organic matter contains a large number of aliphatic groups (-CH₂- and -CH₃), as well as polar oxygen-containing groups such as carbonyl, ether, etc. The latter groups have a negative effect on the rheological properties of extractive pitch. The influence of coal type and coal-oil paste composition on the yield and quality indicators of the pitch-like products of thermal dissolution was analyzed. The use of a coal-solvent mixture with the high percentage of coal is not reasonable because of the high viscosity of final extractive pitches, which hinders the preparation of a homogeneous mixture for the formation of carbon-graphite products.