Composition of Tuva coals and their extracts according to pyrolysis and TGA data

Extracts – hypercoals, were obtained from Tuvinian coals of the Ulug-Khem basin by dissolving them in N-methylpyrrolidone. The yield of extracts is 27.3–79.4%, and their ash content is 0.5–0.8%. The composition of the products of pyrolysis, carried out at 420°C, of the initial coals and the extracts obtained from them was studied. It has been shown that rank “Zh” hard coal (coal from the Elegest deposit) can be extracted most effectively. The qualitative and quantitative compositions of pyrolysis products are not fundamentally different in the initial coals and the corresponding extracts. According to TGA data, the decomposition of extracts (hypercoals) occurs at lower temperatures relative to the original coals with a high yield of volatile components.