Thermal apparatus and process for removing contaminants from oil

  • US 6,589,417 B2
  • Filed: 05/22/2001
  • Issued: 07/08/2003
  • Est. Priority Date: 09/27/1996
  • Status: Expired due to Term
First Claim
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1. 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.

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