Process of drying and heating oil-containing solids

Abstract From the Canadian patent

In a drying zone the solids are directly, contacted with superheated steam which enters at a tem-, perature of at least 200°C. Part of the mixed vapors leaving the drying zone are removed and the remaining mixed vapors are heated to at least 200°C and recycled to the drying zone. The mixed vapors may be heated e.g. by an, indirect heat exchange with hot flue gas or hot solids. The heated solids may subsequently be distilled at temperatures of about 400 to 600°C in a mixture with a hot fine-grained heat transfer medium. The drying zone may be provided in a vertical pneumatic conveyor a fluidized, bed, a rotary kiln or a cyclone battery.