Patent US5892509A successfully refreshed from Google Patents.
Patent EP0747102A1 successfully refreshed from Google Patents.
EP0747102A1
Expired / Lapsed
EP
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Improved oil re-refining method and apparatus
Assignee: Avista Resources Inc
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Filing: 1996-06-07
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Granted: —
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Expires: 2016-06-07
Abstract
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).
Inventors
- 👤 Kalevi John Kenton
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:37
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/10; B01D1/00; B01D1/0094; B01D3/42; B01D5/00; B01D5/0027; B01D5/0033; B01D5/0036
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
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.
Claim 2
Dependent Claim
43 words
A method according to claim 1, wherein a portion of the feedstock is recirculated to the evaporation chamber at a higher temperature and a greater flow rate than the original feedstock by way of a recirculation circuit including a pump and a heater.
Claim 3
Dependent Claim
33 words
A method according to claim 1 or 2, wherein distillate obtained from the spray condenser is recirculated to the spray condenser by way of a recirculation circuit including a pump and a heater.
Claim 4
Dependent Claim
43 words
A cyclonic vacuum evaporator provided with temperature and pressure control and comprising a substantially void evaporation chamber into which, in use, feedstock is substantially tangentially injected, and a spray condenser in communication with the evaporation chamber in which a distillate may be obtained.
Claim 5
Dependent Claim
23 words
An evaporator as claimed in claim 4, wherein the evaporator is provided with a feedstock recirculation circuit including a pump and a heater.
Claim 6
Dependent Claim
25 words
An evaporator as claimed in claim 4 or 5, wherein the evaporator is provided with a distillate recirculation circuit including a pump and a heater.
Claim 7
Dependent Claim
95 words
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.
Claim 8
Dependent Claim
23 words
A plant as claimed in claim 7, wherein each evaporator and its associated spray condenser comprises a modular unit mounted in a frame.
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