Close connections were found between the thermal stabilities of coke raw materials during heating up to the coking temperature and their thermal analysis data. The obtained coking residues were in correlation with the coke yield of non-pressurized coking.
Thermal analysis was carried out on peat and its residues after successive separation of water-soluble substances (6.8%), bitumens (3.9%), hemicellulose (5.9%), humic acids (33.4%) and cellulose (21.5%). The primary peat gives two exothermal effects, at 290° and at 275°. After humic acid and cellulose separation, respectively, the second effect decreases and then disappears completely.
Authors:S. Malovska, D. Rustschev, and M. Angelova-Dodova
A successive extraction of bitumes from black coal was carried out using the following solvents: petroleum ether, petroleumether-benzene (1∶1), benzene, benzene-ethyl ether (1∶1), ethyl ether, ethyl ether ethanole (1∶1), ethanol. These extract organic products as follows: 0.06, 0.16, 0.11, 0.21, 0.07, 0.29 and 0.70% respectively. The obtained by the above mentioned solvents chujniuds were compounds to the thermal and IR-spectral analysis.
Authors:I. Tcholakova, R. Shopova, and D. Rustschev
The thermal behaviour of some Cu(II) compounds formed with 1,4-disubstituted piperazine derivatives has been studied. The
investigations were performed on a MOM 1500 derivatograph. The endothermic effects observed at 170–180°C are associated with
the processes of dehydration and dehalogenation of the compounds, with general formula LH2·CuCl4·H2O, whereL is the piperazine derivative. The residue at 600°C remains relatively constant.