US4018878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing carbon black
Assignee: Ashland LLC
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Filing: 1975-12-29
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Granted: 1977-04-19
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Expires: 1995-12-29
Abstract
Abstract The oil furnace process for the production of tread grade rubber reinforcing carbon black is modified in respect of the manner in which a carbon black producing feedstock oil is introduced into the cracking zone so as to facilitate the formation of carbon black of requisite structure characteristics having improved particle size distribution.
Inventors
- 👤 Richard H. Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:12
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
In the furnace process for the production of high tint, tread-grade rubber reinforcing carbon black wherein a fuel gas is essentially completely combusted in a tubular chamber having a diameter substantially larger than length thereof and whereupon the resultant combustion gases enveloping a centrally confined spray of a normally liquid hydrocarbon feedstock are introduced into a tubular reaction zone to effect therein the thermal decomposition of the feedstock into carbon black under highly turbulent flow conditions, said tubular reaction zone being centrally aligned with said chamber and in open communication therewith and having a diameter substantially smaller than that of the chamber; the improvement comprising introducing a plurality of laterally disposed individual sprays of the feedstock into said reaction zone whereby the situs of injection are contiguous to said communicating opening of the reaction zone.
Claim 2
Dependent Claim
135 words
In the furnace process for the production of high tint, tread-grade rubber reinforcing carbon black wherein a fuel gas is essentially completely combusted in a tubular chamber having a diameter substantially larger than length thereof and whereupon the resultant combustion gases enveloping a centrally confined spray of a normally liquid hydrocarbon feedstock are introduced into a tubular reaction zone to effect therein the thermal decomposition of the feedstock into carbon black under highly turbulent flow conditions, said tubular reaction zone being centrally aligned with said chamber and in open communication therewith and having a diameter substantially smaller than that of the chamber; the improvement comprising introducing a plurality of laterally disposed individual sprays of the feedstock into said reaction zone whereby the situs of injection are contiguous to said communicating opening of the reaction zone.
Claim 3
Dependent Claim
23 words
The improvement in accordance with Claim 1 wherein the combustion gases are introduced into said reaction zone in a generally linear flow pattern.
Claim 4
Dependent Claim
41 words
The improvement in accordance with claim 2 wherein the laterally disposed feedstock sprays include a centrally positioned spray in relation to the reaction zone opening and a plurality of sprays radially removed therefrom and positioned within the periphery of said opening.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |