US3840344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon black production
Assignee: Alzeta Corp
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Filing: 1972-06-06
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Granted: 1974-10-08
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Expires: 1992-06-06
Abstract
Abstract Carbon black is produced by pyrolysis of a hydrocarbon feedstock in a furnace having porous walls through which gaseous fuel and oxygen-containing gas are introduced into the furnace to produce hot combustion gases into which the feedstock is dispersed for thermal decomposition to carbon black. The porous walls have several advantages such as prevention of carbon deposition, greater uniformity of temperature, less damage to the walls and diminished heat loss from the furnace. Great flexibility of operation is made possible by the porous walls so that a wide variety of carbon black grades can be produced.
Inventors
- 👤 P Garbo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:02
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; B; B01; B01J; B01J12/00; B01J12/005; F; F23; F23G; F23G5/00; F23G5/08; F23G5/12; F23G7/00; F23G7/008; B01J19/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
A FURNACE FOR PRODUCING CARBON BLACK BY THERMAL DECOMPOSITION OF A PETROLEUM RESIDUE COMPRISING: A. A COMBUSTION SECTION INTO WHICH A FIRST COMBUATIBLE MIXTURE OF FREE OXYGEN-CONTAINING GAS AND GASEOUS FUEL IS SUPPLIED THROUGH A FIRST POROUS REFRACTORY WALL OF SAID COMBUSION SECTION AND INTO WHICH A SECOND COMBUSTIBLE MIXTURE OF FREE OXYGEN-CONTAINING GAS AND GASEOUS FUEL IS SUPPLIED THROUGH A SECOND SEPARATE POROUS REFRACTORY WALL OF SAID COMBUSTION SECTION, BOTH OF SAID POROUS REFRACTORY WALLS BEING POSITIONED IN SPACED FACING RELATION TO ONE ANOTHER AND ADAPTED FOR FLAMELESS SURFACE COMBUSTION ON THE SURFACE THEREOF FROM WHICH ONE OF SAID COMBUSTIBLE MIXTURES EMANATES; B. SPRAYING MEANS FOR DISPERSING SAID PETROLEUM RESIDUE INTO SAID COMBUSTION SECTION IN PROXIMITY TO BOTH OF SAID POROUS REFRACTORY WALLS; AND C. A REFRACTORY LINWD SECTION COMMUNICATING WITH SAID COMBUSTION SECTION FOR PASSAGE THERETHROUGH OF THE GASEOUS EFFLUENT FROM SAID COMBUSTION SWCTION SO THAT SAID THERMAL DECOMPOSITION OF SAID PETALIUM RESIDUE INITED IN SAID COMBUSTION SECTION IS SUBSTANTIALLY COMPLETED DEFORE SAID GASEOUS EFFLUENT DISCHARGED FROM SAID REFRACTORY LINED SECTION.
Claim 2
Dependent Claim
173 words
A FURNACE FOR PRODUCING CARBON BLACK BY THERMAL DECOMPOSITION OF A PETROLEUM RESIDUE COMPRISING: A. A COMBUSTION SECTION INTO WHICH A FIRST COMBUATIBLE MIXTURE OF FREE OXYGEN-CONTAINING GAS AND GASEOUS FUEL IS SUPPLIED THROUGH A FIRST POROUS REFRACTORY WALL OF SAID COMBUSION SECTION AND INTO WHICH A SECOND COMBUSTIBLE MIXTURE OF FREE OXYGEN-CONTAINING GAS AND GASEOUS FUEL IS SUPPLIED THROUGH A SECOND SEPARATE POROUS REFRACTORY WALL OF SAID COMBUSTION SECTION, BOTH OF SAID POROUS REFRACTORY WALLS BEING POSITIONED IN SPACED FACING RELATION TO ONE ANOTHER AND ADAPTED FOR FLAMELESS SURFACE COMBUSTION ON THE SURFACE THEREOF FROM WHICH ONE OF SAID COMBUSTIBLE MIXTURES EMANATES; B. SPRAYING MEANS FOR DISPERSING SAID PETROLEUM RESIDUE INTO SAID COMBUSTION SECTION IN PROXIMITY TO BOTH OF SAID POROUS REFRACTORY WALLS; AND C. A REFRACTORY LINWD SECTION COMMUNICATING WITH SAID COMBUSTION SECTION FOR PASSAGE THERETHROUGH OF THE GASEOUS EFFLUENT FROM SAID COMBUSTION SWCTION SO THAT SAID THERMAL DECOMPOSITION OF SAID PETALIUM RESIDUE INITED IN SAID COMBUSTION SECTION IS SUBSTANTIALLY COMPLETED DEFORE SAID GASEOUS EFFLUENT DISCHARGED FROM SAID REFRACTORY LINED SECTION.
Claim 3
Dependent Claim
25 words
The furnace of claim 1 wherein each of the two separate porous refractory walls is a layer of ceramic fibers molded on a metal screen.
Claim 4
Dependent Claim
38 words
The furnace of claim 1 wherein one of the two separate porous refractory walls is in a conical form and the other of said two walls is in a frusto-conical form within which said conical form is positioned.
Claim 5
Dependent Claim
25 words
The furnace of claim 3 wherein each of the two separate porous refractory walls is a layer of ceramic fibers molded on a metal screen.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |