Solvent effect on the extraction of Beypazari oil shale

Beypazari oil shale was subjected to supercritical fluid extraction with wa ter and toluene separately. Considerable differences were observed in the y ields (wt %) and compositions of the oils obtained from oil shale SCW (supe rcritical water) gave a higher conversion degree of kerogen in oil shale th an SCT (supercritical toluene), whereas oil yield in SCT was 41% more than that in SCW. Oils having more asphaltenic and polar compounds were obtained from SCW. Although the polar contents decreased in SCT oils with increasin g temperature, they increased in SCW oils. No n-alkenes-1 were observed in the aliphatic fraction of SCW extraction oil. The temperature affected the isomerization of aliphatics in SCT oils. The molecular weight of oils was a ffected basically by the temperature at both supercritical fluids.