COMPARATIVE STUDY OF PYROLYSIS AND THERMAL DISSOLUTION OF ESTONIAN AND MONGOLIAN KHOOT OIL SHALES

摘要

Two oil shale (OS) samples with different organic matter (OM) content from the Khoot deposit, Mongolia were characterized, their pyrolysis and thermal dissolution experiments were carried out and the results compared with those obtained for the Estonian oil shale sample in the same experimental conditions. The thermal decomposition of the organic matter of oil shale samples starts in the temperature range of 200-300 degrees C, while the highest yield of liquid products (tar and pyrolysis water) and the lowest yield of solid residue are obtained at 500-600 degrees C, which can be considered an optimal temperature range for the pyrolysis of OS samples. In this temperature region, 23% of tar is obtained from the Estonian oil shale sample, which is more than the yield from Mongolian Khoot oil shale samples. The higher tar yield from the Estonian oil shale sample is due to its lower ash and higher organic content compared to Mongolian Khoot oil shale samples.