eesti teaduste
akadeemia kirjastus
SINCE 1984
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2021): 1.442
PDF | doi: 10.3176/oil.2008.4.03

Ille Johannes, A. ZAIDENTSAL
A step-by-step mathematical model was deduced for description of the co-effect of time, temperature and heating rate at low-temperature (370–410 °C) on the yield of kukersite oil shale pyrolysis products in a laboratory retort. According to the scheme applied, the parallel formation of thermobitumen and volatiles from kukersite, and parallel-consequent formation of volatiles and coke from the thermobitumen formed were approximated to the first order kinetic reac­tions. The algorithms for estimation of the corresponding rate coefficients (k1–k4) were proposed. The values of apparent activation energy (E1-E4) and frequency factor (A1-A4) were calculated using the temperature dependencies of the rate coefficients estimated on the basis of experimental results obtained at isothermal retorting. A kinetic compensation effect was revealed between the bulk of kinetic constants found: lnA = 0.176(±0.009)E – 2.59(±2.29). The share factors and their temperature dependencies for distribu­tion of malthenes and asphaltenes in thermo­bitumen, and gas and oil in volatiles were found from the experimental results of kukersite low-tem­perature retorting. The effect of time on the yield of the products pre­dicted introducing the constants found into the model deduced agreed satisfactory with the experimental results obtained at retort­ing of kukersite under non-linear increase of temperature up to 370–410 °C and keeping 20–60 minutes under the nominal temperature.

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