New pitches with very significant maturation degree obtained by supercritical extraction of Moroccan oil shales

• Published in: The Journal of supercritical fluids 2008-12, Vol.47 (2), p.195-199
• Main Authors: Abourriche, A., Adil, A., Oumam, M., Hannache, H., Pailler, R., Naslain, R., Birot, M., Pillot, J.-P.
• Format: Article
• Language: English
• Subjects: Maturation; Oil shale; Pitch; Supercritical extraction
• ISSN: 0896-8446; 1872-8162
• DOI: 10.1016/j.supflu.2008.07.016

Supercritical extraction of Moroccan oil shales with water–shale oil as solvent afforded new pitches. The influence of the composition of the extraction fluid has been worked out, using a method based on quantitative infrared spectroscopy. It enabled us to show that a mixture composed of 1/3 water–2/3 shale oil was a very efficient solvent for oil shale extraction, giving a suitable maturation of the organic matter. In the present work, new pitches were obtained by supercritical extraction of Moroccan oil shales with water–shale oil as solvent. The aim of the research was to obtain pitches with very significant maturation degree of the organic matter. The evolution of the pitch structure was studied through indexes calculated from quantitative infrared spectroscopy. The classification of the pitches enabled us to assess their degree of maturation. This allowed us to establish the water–shale oil mixture composition likely to give the best maturation of the oil shale′s organic matter.