Study of the Liquid Products of Pre-Boring of Middle-Metamorphized Coals for Enhanced Environmental Safety of Thermal Technologies
Chemistry for Sustainable Development
||каменные угли, низкотемпературный пиролиз, смола полукоксования, асфальтены, углеводороды, coals, low-temperature pyrolysis, semi-coking resin, asphaltenes, hydrocarbons
Institute of Coal Chemistry and Chemical Materials, Federal Research Center for Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, Kemerovo, Russia
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Data on the yield and composition of liquid products formed in the process of semi-coking of coals of the middle stages of metamorphism were obtained using a complex of analytical methods. It was demonstrated that the yield of semi-coking resins decreases with an increase in the genetic maturity of coal, but the aromaticity of liquid products increases, as indicated by a decrease in the H/C atomic ratio, as well as the presence of high-molecular-weight hydrocarbons in the form of asphaltenes and resinous substances. It was revealed by means of chromatography-mass spectrometry that during low-temperature pyrolysis, liquid products are formed, which are represented by a complex mixture of saturated and aromatic hydrocarbons. In all the resins, normal and branched n -alkanes and n -alkenes are identified. The aromatic hydrocarbons of the studied resins contain one to five benzene rings per molecule. Different amounts of these components in the composition of liquid products are due to differences in the chemical structure of the organic mass of coal samples studied. The obtained results expand the understanding of the composition of liquid products formed from the organic mass of coal during its low-temperature heat treatment in the semi-coking mode and open the ways to improve the environmental safety of basic technologies taking into account the number, individual composition and toxicity indicators of all the products formed.