Abstract

Pyrolysis of Condor and Stuart oil shales in a continuous fluidized bed reactor heated by through-wall thermal conduction gave oil yields close to modified Fischer Assay; however, when these shales were pyrolysed in the same reactor with an ash-to-shale recycle ratio of two, there was up to 28 % oil loss. The lost oils were mainly heavy fractions which adsorbed onto shale ash. The main reaction appeared to be coking. The high internal surface areas of the Condor and Stuart ashes are possibly a key factor in the reduction of oil yield. Options for reducing this loss are outlined.

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