US3761577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary combustion process and apparatus for the manufacture of carbon black
Assignee: Continental Carbon Co
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Filing: 1971-07-06
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Granted: 1973-09-25
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Expires: 1991-07-06
Abstract
Abstract Relatively large particle-size, low structure carbon black is manufactured by applying primary heat in conventional fashion to a hydrocarbon oil feedstock and then applying secondary heat in the form of hot combustion gases introduced into the reactor downstream of the primary reaction zone. The flow of these secondary combustion gases is longitudinal with respect to the axis of the reactor and is introduced into the reactor in a plurality of streams directed in downstream flow in close proximity with the outer periphery of the secondary reaction zone. The reactor is of enlarged diameter just downstream of the point of introduction of the secondary combustion gases in order that the concentration and linear downstream velocity of the combustion products is essentially unaltered.
Inventors
- 👤 K Dahmen
- 👤 W Crull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:07
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; B; B01; B01J; B01J19/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
68 words
The apparatus of claim 1 in which the means (i) comprises a plurality of secondary combustion ports extending through the upstream end of said secondary reactor section, said ports being located throughout the circumference of said secondary reactor section and pointed in a downstream direction along the periphery of the lining of said secondary reactor section, said means also including a secondary burner means communicating with said ports.
Claim 2
Dependent Claim
44 words
The apparatus of claim 2 in which said secondary burner means comprises at least one tunnel burner tangentially communicating with an annular plenum chamber surrounding the downstream end of said primary reactor section, said secondary combustion ports being in communication with said plenum chamber.
Claim 3
Dependent Claim
78 words
The apparatus of claim 1 in which said means (i) comprises an annular hollow burner ring circumferentially disposed about the downstream end of said primary reactor section; said ring containing a plurality of holes facing downstream into an annular combustion chamber defined by the housing and the outer surface of said first lining at its downstream end; said ring being connected to a fuel conduit or conduits; said annular combustion zone being connected to a source of air.
Claim 4
Dependent Claim
42 words
The apparatus of claim 4 in which the downstream end of said first refractory lining is flared outwardly in the downstream direction and in which there is disposed within said annular combustion chamber an annular disc which is slideable along said housing.
Claim 5
Dependent Claim
32 words
The apparatus of claim 5 in which said annular disc is connected to said burner ring and said fuel conduit, and in which said fuel conduit is slideably mounted to said housing.
Claim 6
Dependent Claim
17 words
The apparatus of claim 1 in which the means (i) comprises a plurality of air-aspirated gas burners.
Claim 7
Dependent Claim
69 words
The apparatus of claim 1 in which the means (e) comprises a cylindrical baffle or sleeve coaxially mounted within said head section having a diameter substantially equal to the inside diameter of the said refractory lining and extending from the downstream end of said head section To the vicinity of, but spaced from, said end plate, thereby establishing an annular zone between said second housing section and said baffle.
Claim 8
Dependent Claim
69 words
The apparatus of claim 2 in which the means (e) comprises a cylindrical baffle or sleeve coaxially mounted within said head section having a diameter substantially equal to the inside diameter of the said refractory lining and extending from the downstream end of said head section to the vicinity of, but spaced from, said end plate, thereby establishing an annular zone between said second housing section and said baffle.
Claim 9
Dependent Claim
69 words
The apparatus of claim 3 in which the means (e) comprises a cylindrical baffle or sleeve coaxially mounted within said head section having a diameter substantially equal to the inside diameter of the said refractory lining and extending from the downstream end of said head section to the vicinity of, but spaced from, said end plate, thereby establishing an annular zone between said second housing section and said baffle.
Claim 10
Dependent Claim
69 words
The apparatus of claim 4 in which the means (e) comprises a cylindrical baffle or sleeve coaxially mounted within said head section having a diameter substantially equal to the inside diameter of the said refractory lining and extending from the downstream end of said head section to the vicinity of, but spaced from, said end plate, thereby establishing an annular zone between said second housing section and said baffle.
Claim 11
Dependent Claim
69 words
The apparatus of claim 5 in which the means (e) comprises a cylindrical baffle or sleeve coaxially mounted within said head section having a diameter substantially equal to the inside diameter of the said refractory lining and extending from the downstream end of said head section to the vicinity of, but spaced from, said end plate, thereby establishing an annular zone between said second housing section and said baffle.
Claim 12
Dependent Claim
69 words
The apparatus of claim 6 in which the means (e) comprises a cylindrical baffle or sleeve coaxially mounted within said head section having a diameter substantially equal to the inside diameter of the said refractory lining and extending from the downstream end of said head section to the vicinity of, but spaced from, said end plate, thereby establishing an annular zone between said second housing section and said baffle.
Claim 13
Dependent Claim
69 words
The apparatus of claim 7 in which the means (e) comprises a cylindrical baffle or sleeve coaxially mounted within said head section having a diameter substantially equal to the inside diameter of the said refractory lining and extending from the downstream end of said head section to the vicinity of, but spaced from, said end plate, thereby establishing an annular zone between said second housing section and said baffle.
Claim 14
Dependent Claim
22 words
The apparatus of claim 3 in which there are at least two of said tunnel burners spaced about said secondary reactor section.
Claim 15
Dependent Claim
22 words
The apparatus of claim 10 in which there are at least two of said tunnel burners spaced about said secondary reactor section.
Claim 16
Dependent Claim
128 words
In a process for the production of carcass grades of oil furnace carbon black in which a carbon black feedstock is introduced axially into one end of an elongate, substantially cylindrical, refractory lined reactor into a primary reaction zone heated by primary hot combustion gases from the burning of a hydrocarbon gas or other fuel with air, said combustion gases flowing in longitudinal downstream flow, the improvement which comprises introducing a secondary stream of hot combustion gases into the upstream end of an enlarged secondary reaction zone, said secondary stream having a temperature at least as high as the reaction products entering the secondary reaction zone from the primary reaction zone and being introduced in downstream substantially longitudinal flow along the outer periphery of said secondary reaction zone.
Claim 17
Dependent Claim
96 words
The process of claim 17 in which said primary combustion gases and said secondary combustion gases are introduced at a rate sufficient to supply heat in the amount of about 3,500-5,200 BTU and 1,000-2,500 BTU per pound of feedstock, respectively; in which the ratio of said primary heat to said secondary heat is about 1-4; and in which the point of introduction of said secondary combustion gases is located at a distance downstream of the point of introduction of said primary combustion gases equal to about 6-14 times the inside diameter of the primary reaction zone.
Claim 18
Dependent Claim
69 words
The process of claim 18 in which: a. said primary heat is supplied in an amount of about 3,600-4, 500 BTU per pound of said feedstock; b. said secondary heat is supplied at a distance downstream of the point of introduction of said primary heat equal to about 7-12 times the inside diameter of said refractory lining in an amount of about 1,200-2,000 BTU per pound of said feedstock.
Claim 19
Dependent Claim
36 words
The process of claim 19 in which the air-to-gas ratio for said primary combustion is from about 12:1 to about 14:1 and the air-to-gas ratio for said secondary combustion is from about 12:1 to about 18:1.
Claim 20
Dependent Claim
37 words
The process of claim 17 in which said secondary stream of hot combustion gases is introduced into said enlarged secondary reaction zone such that the concentration and linear downstream velocity of the combustion products are essentially unaltered.
Claim 21
Dependent Claim
37 words
The process of claim 18 in which said secondary stream of hot combustion gases is introduced into said enlarged secondary reaction zone such that the concentration and linear downstream velocity of the combustion products are essentially unaltered.
Claim 22
Dependent Claim
37 words
The process of claim 19 in which said secondary stream of hot combustion gases is introduced into said enlarged secondary reaction zone such that the concentration and linear downstream velocity of the combustion products are essentially unaltered.
Claim 23
Dependent Claim
37 words
The process of claim 20 in which said secondary stream of hot combustion gases is introduced into said enlarged secondary reaction zone such that the concentration and linear downstream velocity of the combustion products are essentially unaltered.
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |