US4746406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrolyzing plastic or rubber wastes
Assignee: Brown Boveri und Cie AG Germany
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Filing: 1986-12-19
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Granted: 1988-05-24
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Expires: 2006-12-19
Abstract
Abstract Pyrolytic reprocessing of plastic, rubber, or other hydrocarbon materials in which the resultant pyrolysis gas is brought in a cooling stage to a temperature just above the freezing point of water and to a pressure of approximately 0.8 to 1.4 bar of overpressure. The resultant condensate is then separated and heated to a normal storage temperature and the super atmospheric pressure on the condensate reduced to atmospheric pressure. The gas produced thereby comprising C 4 hydrocarbon compounds is supplied to the pyrolysis process as special product gas. By means of this provision, the proportion of aromatic compounds in the pyrolysis gas is raised substantially.
Inventors
- 👤 Hinrich Timmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:27
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/02; C10B; C10B47/00; C10B47/18; C10B47/22; C10B47/24; C10B53/00; C10B53/07; C10G1/002; C10G1/10; Y; Y02; Y02P; Y02P20/00; Y02P20/141; Y02P20/143; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
A method for pyrolyzing material containing polastic or rubber waste, comprising; thermally decomposing the material in a pyrolysis zone at substantially atmospheric pressure to produce a pyrolysis gas, cooling the pyrolysis gas to a temperature of approximately 100° to 150° C. so that a part thereof forms a hot condensate, separating the hot condensate from the remainder of the pyrolysis gas, subjecting a flow of the remainder of the pyrolysis gas in a cooling stage to a temperature of approximately 0.5° to 2° C. and to a pressure increase of approximately 0.8 to 1.4 bar and producing a cold condensate, separating the cold condensate produced in the cooling stage, reducing the pressure on the cold condensate to a lower pressure, and heating the cold condensate to approximately 18° to 30° C. at the reduced lower pressure so as to liberate C 4 hydrocarbon compounds in gaseous form from the condensate and returning the gaseous C 4 hydrocarbon compounds to the pyrolysis zone.
Claim 2
Independent Claim
162 words
A method for pyrolyzing material containing polastic or rubber waste, comprising; thermally decomposing the material in a pyrolysis zone at substantially atmospheric pressure to produce a pyrolysis gas, cooling the pyrolysis gas to a temperature of approximately 100° to 150° C. so that a part thereof forms a hot condensate, separating the hot condensate from the remainder of the pyrolysis gas, subjecting a flow of the remainder of the pyrolysis gas in a cooling stage to a temperature of approximately 0.5° to 2° C. and to a pressure increase of approximately 0.8 to 1.4 bar and producing a cold condensate, separating the cold condensate produced in the cooling stage, reducing the pressure on the cold condensate to a lower pressure, and heating the cold condensate to approximately 18° to 30° C. at the reduced lower pressure so as to liberate C 4 hydrocarbon compounds in gaseous form from the condensate and returning the gaseous C 4 hydrocarbon compounds to the pyrolysis zone.
Claim 3
Dependent Claim
14 words
A method as defined by claim 1, wherein said lower pressure is atmospheric pressure.
Claim 4
Dependent Claim
44 words
A method as defined by claim 1, wherein the pyrolysis zone is a fluidized bed, which is maintained by the supply of a fluidizing gas, and wherein the gaseous C 4 hydrocarbon compounds are supplied along with the fluidizing gas to the fluidized bed.
Claim 5
Dependent Claim
61 words
A method as defined by claim 3, wherein the fluidized bed is disposed in the lower region of a pyrolysis reactor and bounded by a side wall of the pyrolysis reactor and wherein the fluidizing gas blown in from top to bottom in a lower region of the pyrolysis reactor, in the vicinity of the side wall, with a blower device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |