Investigation using TGA and DSC

The largest oil shale reservoir in TVirkey is situated near Goyniik representing an estimated capacity of 10 tons in layers of 100 to 150 meters deep which are not very 

TGA in air displays distinct steps in the curve for the oil shale, at temperatures between 225 °C and 270 °C, 290 °C and 400 °C, and 430 °C and 525 °C. The corresponding DTG maximum temperatures occur at 262 °C, 383 °C, and 443 °C. These steps in the TGA curve do not appear so clearly in the thermogravimetry in air of the kerogen concentrate, but the DTG peak maxima are also present at temperatures of 269 °C, 383 °C, and 455 °C. The ash at 800 °C of the oil shale amounts to 14.3 wt% and that of the kerogen concentrate to 4.4 wt % indicating that complete demineralization has not taken place. It is not possible to tell whether this weight is partly lost from the minerals of the oil shale. 

Only a small portion of the organic substance may be extracted from the oil shale by organic solvents. Extraction using solvents with different solubility parameters 5, according to Hildebrandt, yields extracts, which have altered characteristics as a consequence of this solubility parameter (Table 4-146). The following solvents were used  

Thermogravimedy in argon shows that the evaporation start temperatures of the extracts (T1 %, T5 %) increase with increasing solubility parameter 5, whereas the distillable fraction AG400 decreases and the residues J 600 and i 800 increase (Fig. 4-113). This is a consequence of the rising amounts of aromatic, coke-generating substances, whieh were extracted with solvents of increasing solubility parameter. The curves of the simulated distillation of the extracts correspond approximately to that of an atmospheric residue of a Middle East crude (for example AR Kirkuk). 

Residues at 600 °C / 600 versus Solubility Parameter 8 of the Extraction Solvent 

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