Patent ID: 6589417
Filing Date: 2003-07-08
Classification: B01J,C10B,C10G,C10M

Abstract:
A thermal process for removing water, metal and halide contaminants from used oil comprising:providing a rotating vessel having a circumferential wall and end walls forming an internal reaction zone; providing a charge of non-ablating coarse granular solids which form a bed within the reaction zone; heating the outside of the vessel so as to indirectly heat the reaction zone and the bed of coarse granular solids by conduction through the vessel's walls; feeding contaminated used oil through one of the vessel's end walls so that it discharges into the reaction zone; vaporizing and pyrolyzing the oil within the heated reaction zone to produce hydrocarbon vapours and deposit coke, whereby contaminants become associated with the coke; scouring the vessel walls with the bed of coarse granular solids to remove coke deposits and comminute coke into fine solids; removing the hydrocarbon vapours and fine solids from the reaction zone; separating the fine solids and hydrocarbon vapours; and condensing the hydrocarbon vapours to recover substantially contaminant-free product oil.