Results on the application of supercritical carbon dioxide extraction (SFE) at different temperatures are presented, and comparison with classical Soxhlet chloroform extracts is made. Pure carbon dioxide extracted preferably n-alkanes, whereas modifying of the fluid with methanol inten-sified the extraction of more polar compounds and increased as a result total yield of extract. Increasing of SFE temperature had the same influence on the yield of extract, however, already at 200 °C partial heterolytic cracking of the kerogen of kukersite started. The similarity of composition and relative distribution of n-alkanes, n-alkanones-2, n-alkylbenzenes and n-alkylcyclohexanes in both SFE and Soxhlet extracts of kukersite was observed.

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