US3645685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon black manufacture
Assignee: Phillips Petroleum Co
•
Filing: 1969-11-03
•
Granted: 1972-02-29
•
Expires: 1989-11-03
Abstract
Abstract Carbon black is produced by introducing a hydrocarbon feed and hot combustion gases into a feed introduction zone, passing the resulting mixture into a carbon black formation zone under carbon black forming conditions to produce smoke comprising carbon black, dividing said smoke into separate first and second portions, recycling said first portion of smoke under carbon black forming conditions to the feed introduction zone, and recovering carbon black from said second portion of smoke. Loop reactor apparatus for conducting the process is disclosed.
Inventors
- 👤 Willie W Crouch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:29
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; B; B01; B01J; B01J19/00; B01J19/0006
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
The process of claim 1 in which said first portion of smoke is maintained under carbon black forming conditions during said recycling for a period sufficient to alter the properties of the carbon black in said smoke.
Claim 2
Dependent Claim
39 words
The process of claim 1 in which said second portion of said smoke is maintained under carbon black forming conditions prior to said quenching for a period sufficient to alter the properties of the carbon black in said smoke.
Claim 3
Dependent Claim
30 words
The process of claim 1 in which said first portion of said smoke is induced to recycle by the introduction of said hot combustion gases into said feed introduction zone.
Claim 4
Dependent Claim
24 words
The process of claim 3 in which said first and said second portions of smoke are maintained under substantially identical carbon black forming conditions.
Claim 5
Dependent Claim
23 words
The process of claim 3 in which said first and said second portions of smoke are maintained under unidentical carbon black forming conditions.
Claim 6
Dependent Claim
17 words
The process of claim 1 in which said first and said second portions are unequal in quantity.
Claim 7
Dependent Claim
29 words
The process of claim 1 in which the quantity of said first portion is controlled by the rate of introduction of the combustion gases into said feed introduction zone.
References Cited (Backward Citations)
US2332527A
Cited
US2877717A
Cited
US2779665A
Cited
US2801157A
Cited
US3003855A
Cited
US3333928A
Cited
US3369870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |