Oil re-refining method and apparatus
First Claim
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1. A method of re-refining used oil wherein the used oil is processed in at least one cyclonic vacuum evaporator comprising a substantially void evaporation chamber into which feedstock is substantially tangentially injected, and wherein a fraction of the feedstock is condensed in a spray condenser communicating with the evaporation chamber.
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Abstract
A method and apparatus for re-refining used oil, in which the used oil is processed in at least one cyclonic vacuum evaporator comprising a void evaporation chamber (4) into which feedstock is tangentially injected, and in which a fraction of the feedstock is condensed in a spray condenser (7) communicating with the evaporation chamber (4).
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12 Claims
- 1. A method of re-refining used oil wherein the used oil is processed in at least one cyclonic vacuum evaporator comprising a substantially void evaporation chamber into which feedstock is substantially tangentially injected, and wherein a fraction of the feedstock is condensed in a spray condenser communicating with the evaporation chamber.
- 5. A cyclonic vacuum evaporator provided with temperature and pressure control and comprising a substantially void evaporation chamber, means for injecting feedstock substantially tangentially into said evaporation chamber, and a spray condenser in communication with said evaporation chamber in which a distillate is obtained.
- 10. A plant suitable for re-refining used oil, the plant comprising at least two cyclonic vacuum evaporators each provided with temperature and pressure control and each comprising a substantially void evaporation chamber into which, in use, feedstock is substantially tangentially injected, and each being provided with a spray condenser in communication with the evaporation chamber in which spray condenser a distillate may be collected, wherein the evaporators are linked together such that feedstock which has been processed in a first evaporator may be passed as feedstock to the at least one other evaporator for further processing.
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12. A cyclonic vacuum evaporator provided with a temperature and pressure control and comprising an evaporation chamber defining an interior space substantially void of baffles or other means to impart a cyclonic motion to the feedstock, means for injecting feedstock substantially tangentially into said evaporation chamber, and a spray condenser in communication with said evaporation chamber in which a distillate is obtained.
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