THERMAL DECOMPOSITION OF OIL SHALES IN THE TEMPERATURE REGION 520-800 oC
I. BLYAKHINA
K. UROV
Institute of Chemistry
Tallinn Technical University
15 Akadeemia Rd., Tallinn
12618 Estonia
| In this work the temperature range for stepwise thermal decomposition of kukersite and Dictyonema shale has been extended to 800 oC for elucidating the nature of secondary reactions taking place during the last stages of pyrolysis. It has been established that in the temperature region of 520 - 800 oC the shale oil yield, organic matter basis, decreases and oil quality does not improve. Gas yield is higher mainly on account of CO2 and H2S. Considering also the growth of energy requirements for heating a shale to higher temperatures, it is not expedient to surpass the optimum processing temperature (430 oC and 460 - 470 oC for Dictyonema shale and kukersite, respectively), even locally. |