Pyrolysis methods with product oil recycling
AssigneeWestern Research Institute & ILR Services Inc.
InventorsChang Y. Cha, Michael Duc, Curtis J. Hogan
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Abstract
A two step retorting process for pyrolyzing a solid feed selected from the group consisting of oil shale, tar sand, waste motor oil, and scrap tires to recover valuable products therefrom comprising retorting a mixture of the solid feed in heavy oil at a relatively low temperature, recycling the oil formed back to the first step, and completing the pyrolysis of the residue formed at a higher temperature in the absence of product oil recycling. Apparatus is provided including a means for feeding and soaking the solid feed, a HSPR, an IFBC, and means for handling product liquid and gas.
Claims19
A process for pyrolyzing a solid carbonaceous feed comprising:
- forming a mixture of the solid feed with heavy product oil;
- in a first retorting step, heating the mixture to a first temperature at substantially atmospheric pressure to form light oil, heavy oil, and solid residue;
- recovering the heavy oil from the residue and recycling the heavy oil to the first retorting step;
- in a second retorting step in a horizontal screw pyrolysis reactor, treating the residue at a second temperature at substantially atmospheric pressure, said second temperature being higher than said first temperature, said second retorting step completing pyrolysis of the residue and forming solid residue, product liquid and product gas;
- and
- separating said solid residue from said product liquid and product gas and combusting said solid residue in a fluidized bed to form combusted solid residue and flue gas;
- wherein the hot flue gas downstream of said heavy oil heating step is used to heat air for the combustion step.
Dependencies are inferred from the claim text.