Method for Producing Base Lubricating Oil from Waste Oil
AssigneeGen III Oil Corporation
InventorMartin R. MacDonald
Life of this patent
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Abstract
A method for recovering base oil from waste lubricating oil by separating base oil range constituents from a waste lubricating oil mixture, thereafter separating higher quality base oil constituents and lower quality base oil constituents from the base oil recovered from the waste lubricating oil mixture and thereafter treating the lower quality base oil constituents to produce marketable base oil. The total base oil produced from a waste lubricating oil mixture by this process is greater than the quantity producible by previous processes using only base oil separation from the waste lubricating oil mixture or processes which use only treatment of the base oil recovered from the waste lubricating oil mixture to produce the product base oil.
Claims33
A method for separating a liquid stream comprising a plurality of constituents of varied boiling points by flash distillation in at least one distillation zone comprising at least one flash distillation vessel to produce at least one overhead stream and at least one bottom stream, the method comprising:
- a) passing the liquid stream into a heated liquid layer contained in a flash distillation vessel and producing an overhead stream and a bottom stream and having up to one theoretical plate;
- b) heating the bottom stream to a selected temperature and passing a portion of the heated bottom stream to the flash distillation vessel to maintain the heated liquid layer at a selected temperature and at a selected level in the flash distillation vessel in a lower portion of the vessel;
- c) heating the heated liquid layer in the flash distillation vessel at a temperature sufficient to flash a portion of the liquid feed stream to the flash distillation vessel thereby producing the bottom stream and the overhead stream;
- d) passing at least a portion of the distillate overhead stream out of the distillation vessel.
A method for separating a liquid stream comprising a plurality of constituents of varied boiling points by in-situ flash distillation;
- the method comprising:
- a) charging the liquid stream into a heated liquid layer in a flash vessel having at least a top and a bottom, a liquid stream inlet, a distillate outlet near the top of the vessel, a lower portion and a bottom stream outlet near the bottom of the vessel and up to one theoretical plate, the vessel containing a heated liquid layer in its lower portion, to produce an overhead stream through the overhead outlet and a bottom stream from the bottom stream outlet;
- and
- b) heating the bottom stream from the flash vessel to produce a heated bottom stream and passing a portion of the heated bottom stream back to the liquid layer in the flash distillation zone.
Dependencies are inferred from the claim text.